Supplements and Indoor Rowing: A Sceptical Guide

Abstract

Supplements are a lever on an already-working foundation. The [1] Sports Dietitians Australia factsheets placed the sports-nutrition-education side: sports nutrition education anchors the supplement-evidence framing for the rower ([1] Sports Dietitians, Level 5). The [22] Thomas/Erdman/Burke 2016 joint ACSM/AND/DC nutrition position stand reached the same conclusion from the canonical side: athletic fueling is the foundation, supplements are the gap ([22] Thomas/Erdman/Burke 2016, Level 5).

For the indoor rower, supplements are a tiered discipline. The rower who treats supplements as a tiered stack — strongest-evidence tier first, mixed-evidence tier second, sceptic's tier last — buys fewer products, with better evidence, at better doses, from brands with third-party testing. The article below is the framework for supplements and indoor rowing — the foundation, the strongest-evidence tier (creatine, caffeine, beta-alanine, dietary nitrate, protein), the mixed-evidence tier (sodium bicarbonate, vitamin D when deficient, iron when deficient), the sceptic's tier (probiotics, BCAAs, antioxidants, multivitamins, glucosamine, testosterone boosters, proprietary blends), the third-party-testing discipline, and the clinical-handoff.

The premise: supplements are a lever, not a foundation

Supplements are a lever, not a foundation. The [22] Thomas/Erdman/Burke 2016 joint ACSM/AND/DC nutrition position stand placed this on the canonical side: athletic fueling is the foundation; supplements are the gap ([22] Thomas/Erdman/Burke 2016, Level 5). The [1] Sports Dietitians Australia factsheets reached the same conclusion from the sports-nutrition-education side: sports nutrition education anchors the supplement-evidence framing ([1] Sports Dietitians, Level 5).

The [19] Kerksick 2018 ISSN exercise & sports nutrition review placed the supplement-evidence case on the broad-recommendation side: the strongest-evidence supplements are creatine, caffeine, beta-alanine, dietary nitrate, and protein; the rest are mixed or unproven ([19] Kerksick 2018, Level 5). The [2] Sawka 2007 ACSM fluid-replacement position stand reached the same conclusion from the hydration side: most "performance" benefits in the supplement literature are confounded with hydration status ([2] Sawka 2007, Level 5).

The operational premise: a rower who eats a familiar carb-rich pre-session meal, sleeps ~7-9 hours a night, hydrates to thirst with electrolytes on long sessions, and trains consistently does not need most supplements. The [20] Burke 2011 carbohydrate-intake framework placed the fueling-side anchor ([20] Burke 2011, Level 1a); the [21] Shirreffs 2011 fluid-and-electrolyte review placed the hydration-side anchor ([21] Shirreffs 2011, Level 5). The honest read: the rower who fixes the foundation first rarely needs the supplement aisle at all.

The strongest-evidence tier: creatine

Creatine monohydrate is the rower's strongest-evidence supplement for repeated high-intensity work. The [3] Kreider 2017 ISSN creatine position stand placed this on the canonical side: creatine monohydrate is safe, well-studied, and ergogenic for repeated high-intensity effort ([3] Kreider 2017, Level 5). The [19] Kerksick 2018 ISSN review reached the same conclusion from the broad-recommendation side ([19] Kerksick 2018, Level 5).

The operational dose: ~3-5 g/day of creatine monohydrate, every day, with no loading phase required. The [3] Kreider 2017 position stand reached the same conclusion from the dose-response side: a daily dose of 3-5 g saturates muscle creatine stores within 2-4 weeks ([3] Kreider 2017, Level 1a). The honest read: creatine is the rower's cheapest, safest, most-evidence-backed supplement for 2k, 5k, and 30-minute erg pieces; the rower who skips it is leaving erg score on the table.

The strongest-evidence tier: caffeine

Caffeine is the rower's strongest-evidence supplement for endurance and high-intensity performance. The [5] Spriet 2014 low-dose-caffeine review placed this on the empirical side: caffeine is ergogenic at modest doses of ~3-6 mg/kg ([5] Spriet 2014, Level 1a). The [4] Grgic 2020 caffeine umbrella review of 21 meta-analyses reached the same conclusion from the meta-analytic side: caffeine improves endurance, high-intensity, and repeated-bout performance across the dose-response curve ([4] Grgic 2020, Level 1a).

The operational dose: ~3-6 mg/kg, taken ~60 minutes pre-session, in a form the rower's gut tolerates. The [4] Grgic 2020 umbrella review placed the dose-response side: there is little additional benefit above ~6 mg/kg ([4] Grgic 2020, Level 1a). The [5] Spriet 2014 review reached the same conclusion from the low-dose side ([5] Spriet 2014, Level 1a). The honest read: caffeine is effective, dose-responsive, and cheap; the rower's discipline is timing, tolerance, and sleep — not chasing higher doses.

The strongest-evidence tier: beta-alanine

Beta-alanine is the rower's strongest-evidence supplement for work in the 1-10 minute range. The [8] Trexler 2015 ISSN beta-alanine position stand placed this on the canonical side: beta-alanine buffers muscle acidosis and improves performance in the 1-10 min window ([8] Trexler 2015, Level 5). The [19] Kerksick 2018 ISSN review reached the same conclusion from the broad-recommendation side ([19] Kerksick 2018, Level 5).

The operational dose: ~65 mg/kg/day, taken daily over weeks. The [8] Trexler 2015 position stand reached the same conclusion from the dose-response side: 4-12 weeks of daily loading saturates muscle carnosine ([8] Trexler 2015, Level 1a). The honest read: beta-alanine helps in the 1-10 min range (a 2k piece is on the lower end, a 5k on the higher end); the rower's discipline is daily dosing, not acute pre-session dosing.

The strongest-evidence tier: dietary nitrate

Dietary nitrate (beetroot juice) is the rower's strongest-evidence supplement for sub-maximal steady-state work. The [9] McMahon 2016 dietary-nitrate meta-analysis placed this on the empirical side: dietary nitrate reduces oxygen cost at sub-maximal intensities ([9] McMahon 2016, Level 1a). The [10] Hoon 2014 beetroot-juice rowing trial reached the same conclusion from the rowing-specific side: dietary nitrate improved 2,000-m rowing performance in trained athletes in a dose-dependent way ([10] Hoon 2014, Level 1b).

The operational dose: ~5-8 mmol of nitrate (≈ 70-140 mL of concentrated beetroot juice), taken 2-3 hours pre-session. The [9] McMahon 2016 meta-analysis reached the same conclusion from the dose-response side ([9] McMahon 2016, Level 1a). The honest read: nitrate is a real ergogenic aid with rowing-specific evidence; the rower's discipline is dose, timing, and food-source quality.

The strongest-evidence tier: protein

Protein is the rower's strongest-evidence supplement for recovery and adaptation. The [11] Jäger 2017 ISSN protein-and-exercise position stand placed this on the canonical side: total daily protein intake drives muscle protein synthesis ([11] Jäger 2017, Level 5). The [12] Morton 2018 protein-supplementation meta-analysis reached the same conclusion from the meta-analytic side: protein supplementation augments resistance-training-induced gains in muscle mass and strength ([12] Morton 2018, Level 1a).

The [13] Phillips 2011 protein-for-athletes review placed the protein-requirement side: protein intakes of ~1.6-2.2 g/kg/day support adaptation in trained athletes ([13] Phillips 2011, Level 5). The operational lever: hit total daily protein first; a whey or plant-based powder is only the gap. The [11] Jäger 2017 position stand reached the same conclusion from the total-first side ([11] Jäger 2017, Level 5). The honest read: the rower who eats 1.6-2.2 g/kg/day of protein across 3-4 feedings does not need a protein supplement; the rower who cannot hit that floor uses one to close the gap.

The mixed-evidence tier: sodium bicarbonate

Sodium bicarbonate is the rower's mixed-evidence ergogenic aid for high-intensity exercise. The [6] Carr 2011 alkalosis meta-analysis placed this on the empirical side: induced alkalosis improves high-intensity performance with a moderate effect size ([6] Carr 2011, Level 1a). The [7] Carr 2011 alkalosis + caffeine rowing trial reached the same conclusion from the rowing-specific side: induced alkalosis improved 2,000-m rowing performance alone and in combination with caffeine ([7] Carr 2011, Level 1b).

The operational dose: ~0.2-0.3 g/kg, taken 60-90 minutes pre-session. The honest read: the effect is real but the GI side-effects (nausea, bloating, diarrhoea) make it a sport-specific decision rather than a default. The [6] Carr 2011 meta-analysis reached the same conclusion from the GI-tolerance side ([6] Carr 2011, Level 1a). The rower who tries sodium bicarbonate on race day has changed two variables at once — a familiar pattern.

The mixed-evidence tier: vitamin D (when deficient)

Vitamin D is the rower's mixed-evidence supplement when status is deficient. The [15] Holick 2007 NEJM vitamin-D-deficiency review placed this on the canonical side: vitamin D deficiency is common at northern latitudes in winter, and correction has measurable musculoskeletal benefit ([15] Holick 2007, Level 5). The [25] NIH ODS Vitamin D Fact Sheet reached the same conclusion from the governance side: serum 25(OH)D status is the rower's diagnostic anchor ([25] NIH ODS Vitamin D, Level 5).

The honest read: vitamin D supplementation helps when status is deficient; vitamin D supplementation does not help when status is replete. The [15] Holick 2007 review reached the same conclusion from the dose-response side ([15] Holick 2007, Level 5). The [25] NIH ODS Vitamin D Fact Sheet reached the same conclusion from the dosing side: upper limits and toxic thresholds are the rower's safety anchor ([25] NIH ODS Vitamin D, Level 5). The rower's discipline: test, then supplement to a replete range; do not supplement blindly.

The mixed-evidence tier: iron (when deficient)

Iron is the rower's mixed-evidence supplement when status is deficient, especially for female athletes. The [14] Pedlar 2018 iron-balance review placed this on the empirical side: iron deficiency is common in female endurance athletes, and correction improves endurance capacity ([14] Pedlar 2018, Level 5). The [24] NIH ODS Iron Fact Sheet reached the same conclusion from the governance side: serum ferritin and transferrin saturation are the rower's diagnostic anchors ([24] NIH ODS Iron, Level 5).

The honest read: iron supplementation helps when ferritin is low; iron supplementation does not help when ferritin is replete, and excess iron is harmful. The [14] Pedlar 2018 review reached the same conclusion from the dose-response side ([14] Pedlar 2018, Level 5). The [24] NIH ODS Iron Fact Sheet reached the same conclusion from the upper-limit side: iron has a narrow therapeutic range ([24] NIH ODS Iron, Level 5). The rower's discipline: test ferritin first; supplement only when deficient; do not stack with calcium at the same meal.

The sceptic's tier: probiotics

Probiotics are the rower's sceptic-tier supplement. The [17] Jäger 2019 ISSN probiotic position stand placed this on the canonical side: probiotics are safe but the ergogenic claim is mixed and strain-specific ([17] Jäger 2019, Level 5). The [19] Kerksick 2018 ISSN review reached the same conclusion from the broad-recommendation side: the strongest evidence is for gut-health resilience during heavy training blocks, not for erg score ([19] Kerksick 2018, Level 5).

The honest read: a probiotic the rower takes during a travel block or antibiotic course is a different decision than a probiotic the rower takes for erg score. The [17] Jäger 2019 position stand reached the same conclusion from the strain-specific side: strain matters, dose matters, and the rower should not expect an across-the-board benefit ([17] Jäger 2019, Level 5). The rower's discipline: spend on probiotics only when the goal is gut-resilience, not erg score.

The sceptic's tier: branched-chain amino acids

Branched-chain amino acids (BCAAs) are the rower's sceptic-tier supplement. The [11] Jäger 2017 ISSN protein-and-exercise position stand placed this on the canonical side: BCAAs do not outperform complete protein for muscle protein synthesis ([11] Jäger 2017, Level 5). The [13] Phillips 2011 protein-for-athletes review reached the same conclusion from the protein-requirement side: a complete protein source is the rower's foundation ([13] Phillips 2011, Level 5).

The honest read: a rower who is already eating ~1.6-2.2 g/kg/day of protein across 3-4 feedings does not need BCAAs; the marginal leucine dose in a complete protein meal already exceeds the BCAA-supplementation threshold. The [13] Phillips 2011 review reached the same conclusion from the leucine-threshold side ([13] Phillips 2011, Level 5). The rower's discipline: spend on complete protein first; spend on BCAAs never.

The sceptic's tier: antioxidants

Antioxidant supplements (high-dose vitamins C, E, beta-carotene) are the rower's sceptic-tier supplement. The [18] Bjelakovic 2012 Cochrane antioxidant review placed this on the empirical side: high-dose antioxidant supplements do not reduce mortality and may increase it in some populations ([18] Bjelakovic 2012, Level 1a). The [19] Kerksick 2018 ISSN review reached the same conclusion from the broad-recommendation side: antioxidant supplements are not ergogenic ([19] Kerksick 2018, Level 5).

The honest read: antioxidant supplements can blunt the training-adaptation signal by neutralising the reactive-oxygen-species burst the body uses to drive adaptation. The [18] Bjelakovic 2012 review reached the same conclusion from the mortality side ([18] Bjelakovic 2012, Level 1a). The rower's discipline: eat colourful vegetables and fruit; do not buy high-dose antioxidant pills.

The sceptic's tier: multivitamins

Multivitamin-mineral supplements are the rower's sceptic-tier default. The [19] Kerksick 2018 ISSN review placed this on the broad-recommendation side: a balanced diet is the rower's foundation; a daily multivitamin is rarely necessary and may crowd out better food choices ([19] Kerksick 2018, Level 5). The [22] Thomas/Erdman/Burke 2016 joint nutrition position stand reached the same conclusion from the canonical side ([22] Thomas/Erdman/Burke 2016, Level 5).

The honest read: a rower who eats a varied diet across the week does not need a daily multivitamin; a rower who restricts calories or specific food groups may benefit from a targeted supplement, but that is a clinical question. The [22] Thomas/Erdman/Burke 2016 position stand reached the same conclusion from the per-rower side ([22] Thomas/Erdman/Burke 2016, Level 5). The rower's discipline: eat a varied diet; do not buy a daily multivitamin as an insurance policy.

The sceptic's tier: glucosamine and chondroitin

Glucosamine and chondroitin are the rower's sceptic-tier supplement for joint comfort. The [16] Wandel 2010 BMJ glucosamine/chondroitin network meta-analysis placed this on the empirical side: glucosamine, chondroitin, or their combination do not reduce joint pain or improve joint space in osteoarthritis ([16] Wandel 2010, Level 1a). The [23] Maughan 2019 muscle-cramping review reached the same conclusion from the cramping-and-electrolyte side: most joint and muscle complaints are hydration and training-load problems, not supplement problems ([23] Maughan 2019, Level 5).

The honest read: a rower with persistent joint pain has a clinical problem, not a supplement problem. The [16] Wandel 2010 review reached the same conclusion from the joint-space side ([16] Wandel 2010, Level 1a). The rower's discipline: route persistent joint pain to a clinician, not to a supplement aisle.

The sceptic's tier: testosterone boosters

Testosterone boosters (DHEA, tribulus, fenugreek, "T-boost" proprietary blends) are the rower's sceptic-tier supplement. The [22] Thomas/Erdman/Burke 2016 joint nutrition position stand placed this on the canonical side: there is no evidence for non-prescription testosterone boosters in healthy athletes with normal testosterone ([22] Thomas/Erdman/Burke 2016, Level 5). The [19] Kerksick 2018 ISSN review reached the same conclusion from the broad-recommendation side ([19] Kerksick 2018, Level 5).

The honest read: testosterone boosters are a marketing category, not an evidence category. The [22] Thomas/Erdman/Burke 2016 position stand reached the same conclusion from the doping-risk side: testosterone boosters overlap with WADA-prohibited substances and the rower who takes them has changed the doping-risk profile ([22] Thomas/Erdman/Burke 2016, Level 5). The rower's discipline: a rower with low testosterone has a clinical problem, not a supplement problem.

The sceptic's tier: "muscle-building" proprietary blends

"Muscle-building" proprietary blends are the rower's sceptic-tier default. The [19] Kerksick 2018 ISSN review placed this on the broad-recommendation side: proprietary blends hide their dose behind a "blend" label and the rower cannot verify what they are buying ([19] Kerksick 2018, Level 5). The [1] Sports Dietitians Australia factsheets reached the same conclusion from the sports-nutrition-education side ([1] Sports Dietitians, Level 5).

The honest read: a proprietary blend the rower cannot dose is a supplement the rower cannot evaluate. The [19] Kerksick 2018 ISSN review reached the same conclusion from the transparency side: dose transparency is the rower's evidence ([19] Kerksick 2018, Level 5). The rower's discipline: buy products with declared doses of declared ingredients; do not buy blends.

What to check before you buy: the third-party testing discipline

Third-party testing is the rower's discipline for any supplement. The [27] Informed Sport third-party batch testing program placed this on the contamination-risk side: Informed Sport tests every batch against the WADA prohibited list and certifies the lot number ([27] Informed Sport, Level 5). The [28] NSF Certified for Sport program reached the same conclusion from the US governance side ([28] NSF Certified for Sport, Level 5).

The [26] WADA Prohibited List placed the doping-risk side: the WADA prohibited list is the canonical anchor for substances banned in sport ([26] WADA Prohibited List, Level 5). The operational checklist: (a) does the brand publish batch numbers with the testing certificate? (b) does the testing cover the WADA prohibited list, not just a subset? (c) does the brand name appear on the certifying body's certified-product list? The [27] Informed Sport program placed the batch-number side ([27] Informed Sport, Level 5); the [28] NSF Certified for Sport program placed the US-side side ([28] NSF Certified for Sport, Level 5); the [26] WADA Prohibited List placed the canonical-doping-risk side ([26] WADA Prohibited List, Level 5). The honest read: a rower who takes a non-tested supplement has accepted an unknown doping-risk profile; the rower who takes a third-party-tested supplement has not.

The clinical-handoff: medical supplement interactions

Medical supplement interactions are the rower's clinical-stop boundary. The [22] Thomas/Erdman/Burke 2016 joint nutrition position stand placed this on the canonical side: medical supplement interactions are clinical questions, not coaching questions ([22] Thomas/Erdman/Burke 2016, Level 5). The [17] Jäger 2019 ISSN probiotic position stand reached the same conclusion from the strain-specific side: probiotic and antibiotic interactions are clinical questions ([17] Jäger 2019, Level 5).

The operational handoff: any supplement with a medical claim — thyroid support, blood-sugar control, joint regeneration, testosterone modulation, immune modulation — is a clinical question that belongs to a clinician. The [26] WADA Prohibited List placed the doping-risk side: medical-claim supplements overlap with WADA-prohibited substances ([26] WADA Prohibited List, Level 5). The [24] NIH ODS Iron Fact Sheet reached the same conclusion from the iron-medication-interaction side: iron interacts with thyroid medication, antibiotics, and proton-pump inhibitors ([24] NIH ODS Iron, Level 5). The [25] NIH ODS Vitamin D Fact Sheet reached the same conclusion from the vitamin-D-medication-interaction side: vitamin D interacts with statins, anticonvulsants, and glucocorticoids ([25] NIH ODS Vitamin D, Level 5). The honest read: the rower who is on prescription medication asks the prescribing clinician before stacking any supplement.

Common mistakes: the five ways supplements get misused

Supplements get misused in five common ways. The first is buying a proprietary blend because the marketing claims a synergy. The [19] Kerksick 2018 ISSN review placed this on the transparency side: dose transparency is the rower's evidence ([19] Kerksick 2018, Level 5). The [1] Sports Dietitians Australia factsheets reached the same conclusion from the sports-nutrition-education side ([1] Sports Dietitians, Level 5).

The second is testing a new supplement on race day because the rower wants an edge. The [22] Thomas/Erdman/Burke 2016 joint nutrition position stand placed this on the canonical side: never change two variables at once ([22] Thomas/Erdman/Burke 2016, Level 5). The [4] Grgic 2020 caffeine umbrella review reached the same conclusion from the caffeine-tolerance side: new supplement + race day is a tolerance and a GI-tolerance problem ([4] Grgic 2020, Level 1a).

The third is stacking five supplements to "cover the bases" because the rower is anxious. The [22] Thomas/Erdman/Burke 2016 position stand placed this on the canonical side: stacking increases interaction risk without increasing benefit ([22] Thomas/Erdman/Burke 2016, Level 5). The [24] NIH ODS Iron Fact Sheet reached the same conclusion from the iron-medication-interaction side ([24] NIH ODS Iron, Level 5).

The fourth is taking a non-third-party-tested supplement because it is cheaper. The [27] Informed Sport third-party batch testing program placed this on the contamination-risk side: contamination risk is the rower's unknown doping-risk profile ([27] Informed Sport, Level 5). The [28] NSF Certified for Sport program reached the same conclusion from the US governance side ([28] NSF Certified for Sport, Level 5).

The fifth is managing a medical problem with a supplement because the rower thinks the supplement aisle is safer than the clinic. The [22] Thomas/Erdman/Burke 2016 position stand placed this on the canonical side: medical supplement interactions are clinical questions, not coaching questions ([22] Thomas/Erdman/Burke 2016, Level 5). The [26] WADA Prohibited List reached the same conclusion from the doping-risk side ([26] WADA Prohibited List, Level 5).

Limitations

Supplements have limits. The [19] Kerksick 2018 ISSN review reached the same conclusion from the broad-recommendation side: the supplement-evidence base is concentrated in a few well-studied molecules; the long tail is mostly underpowered trials and proprietary research ([19] Kerksick 2018, Level 5). The [4] Grgic 2020 caffeine umbrella review reached the same conclusion from the meta-analytic side: even well-studied supplements show wide inter-individual variability ([4] Grgic 2020, Level 1a).

The honest read for the rower: supplements are a per-rower implementation; the rower's per-rower scaling is the work. The [1] Sports Dietitians Australia factsheets placed this on the sports-nutrition-education side: dose, timing, and tolerance are per-rower ([1] Sports Dietitians, Level 5). The [22] Thomas/Erdman/Burke 2016 position stand reached the same conclusion from the canonical side ([22] Thomas/Erdman/Burke 2016, Level 5).

The peer-reviewed literature on supplements is converging but still young for the long tail — proprietary blends, testosterone boosters, and "joint support" formulas. The same applies to dose-response in female athletes, older masters athletes, and adaptive athletes. The honest coach names the boundary. The honest rower asks about it.

The summary in one paragraph

Supplements are a lever on an already-working foundation. The [1] Sports Dietitians Australia factsheets placed the sports-nutrition-education side ([1] Sports Dietitians, Level 5). The [2] Sawka 2007 ACSM fluid-replacement position stand placed the hydration anchor ([2] Sawka 2007, Level 5). The [3] Kreider 2017 ISSN creatine position stand placed the creatine anchor ([3] Kreider 2017, Level 5). The [4] Grgic 2020 caffeine umbrella review placed the meta-analytic caffeine anchor ([4] Grgic 2020, Level 1a). The [5] Spriet 2014 low-dose-caffeine review placed the low-dose caffeine anchor ([5] Spriet 2014, Level 1a). The [6] Carr 2011 alkalosis meta-analysis placed the empirical sodium-bicarbonate anchor ([6] Carr 2011, Level 1a). The [7] Carr 2011 alkalosis + caffeine rowing trial placed the rowing-specific anchor ([7] Carr 2011, Level 1b). The [8] Trexler 2015 ISSN beta-alanine position stand placed the beta-alanine anchor ([8] Trexler 2015, Level 5). The [9] McMahon 2016 dietary-nitrate meta-analysis placed the empirical nitrate anchor ([9] McMahon 2016, Level 1a). The [10] Hoon 2014 beetroot rowing trial placed the rowing-specific nitrate anchor ([10] Hoon 2014, Level 1b). The [11] Jäger 2017 ISSN protein-and-exercise position stand placed the canonical protein anchor ([11] Jäger 2017, Level 5). The [12] Morton 2018 protein-supplementation meta-analysis placed the empirical protein anchor ([12] Morton 2018, Level 1a). The [13] Phillips 2011 protein-for-athletes review placed the protein-requirement anchor ([13] Phillips 2011, Level 5). The [14] Pedlar 2018 iron-balance review placed the empirical iron anchor ([14] Pedlar 2018, Level 5). The [15] Holick 2007 NEJM vitamin-D-deficiency review placed the canonical vitamin-D anchor ([15] Holick 2007, Level 5). The [16] Wandel 2010 BMJ glucosamine/chondroitin network meta-analysis placed the empirical joint-supplement anchor ([16] Wandel 2010, Level 1a). The [17] Jäger 2019 ISSN probiotic position stand placed the canonical probiotic anchor ([17] Jäger 2019, Level 5). The [18] Bjelakovic 2012 Cochrane antioxidant review placed the empirical antioxidant anchor ([18] Bjelakovic 2012, Level 1a). The [19] Kerksick 2018 ISSN exercise & sports nutrition review placed the broad-recommendation anchor ([19] Kerksick 2018, Level 5). The [20] Burke 2011 carbohydrate-intake framework placed the carbohydrate anchor ([20] Burke 2011, Level 1a). The [21] Shirreffs 2011 fluid-and-electrolyte review placed the fluid-balance anchor ([21] Shirreffs 2011, Level 5). The [22] Thomas/Erdman/Burke 2016 joint ACSM/AND/DC nutrition position stand placed the canonical-fueling anchor ([22] Thomas/Erdman/Burke 2016, Level 5). The [23] Maughan 2019 muscle-cramping review placed the cramping-and-electrolyte anchor ([23] Maughan 2019, Level 5). The [24] NIH ODS Iron Fact Sheet placed the governance iron anchor ([24] NIH ODS Iron, Level 5). The [25] NIH ODS Vitamin D Fact Sheet placed the governance vitamin-D anchor ([25] NIH ODS Vitamin D, Level 5). The [26] WADA Prohibited List placed the doping-risk anchor ([26] WADA Prohibited List, Level 5). The [27] Informed Sport third-party batch testing program placed the contamination-risk anchor ([27] Informed Sport, Level 5). The [28] NSF Certified for Sport program placed the US governance anchor ([28] NSF Certified for Sport, Level 5).

The right posture is to fix the foundation first (familiar carb-rich fueling, hydration with electrolytes on long sessions, ~7-9 h sleep, consistent training), take only the strongest-evidence tier if a gap exists (creatine 3-5 g/day, caffeine 3-6 mg/kg ~60 min pre-session, beta-alanine ~65 mg/kg/day over weeks, dietary nitrate ~5-8 mmol 2-3 h pre-session, protein to ~1.6-2.2 g/kg/day), reserve the mixed-evidence tier for confirmed deficiencies (vitamin D, iron), buy only third-party-tested products, and route any medical-claim supplement to a clinician. Supplements are a lever on an already-working foundation; the rower who fixes the foundation first rarely needs the supplement aisle at all.

For a deeper exploration of how fueling fits into the rower's overall training, see our planning-food-for-a-long-indoor-rowing-session guide and our recovery-meals-after-hard-intervals guide.

What to do with this article

Read the premise: supplements are a lever on an already-working foundation. The [22] Thomas/Erdman/Burke 2016 position stand places this on the canonical side; the [1] Sports Dietitians Australia factsheets places it on the sports-nutrition-education side; the [19] Kerksick 2018 ISSN review places it on the broad-recommendation side.

Read the strongest-evidence tier: creatine 3-5 g/day, caffeine 3-6 mg/kg ~60 min pre-session, beta-alanine ~65 mg/kg/day over weeks, dietary nitrate ~5-8 mmol 2-3 h pre-session, protein to ~1.6-2.2 g/kg/day. The [3] Kreider 2017 ISSN position stand places creatine on the canonical side; the [4] Grgic 2020 umbrella review places caffeine on the meta-analytic side; the [8] Trexler 2015 ISSN position stand places beta-alanine on the canonical side; the [9] McMahon 2016 meta-analysis places nitrate on the empirical side; the [11] Jäger 2017 ISSN position stand places protein on the canonical side.

Read the mixed-evidence tier: sodium bicarbonate 0.2-0.3 g/kg 60-90 min pre-session, vitamin D when deficient, iron when deficient. The [6] Carr 2011 meta-analysis places sodium bicarbonate on the empirical side; the [15] Holick 2007 NEJM review places vitamin D on the canonical side; the [14] Pedlar 2018 review places iron on the empirical side.

Read the sceptic's tier: probiotics (gut-resilience only), BCAAs (no benefit over complete protein), antioxidants (no benefit, possible harm), multivitamins (eat a varied diet instead), glucosamine/chondroitin (no joint benefit), testosterone boosters (no evidence), proprietary blends (no dose transparency). The [17] Jäger 2019 ISSN position stand places probiotics on the canonical side; the [18] Bjelakovic 2012 Cochrane review places antioxidants on the empirical side; the [16] Wandel 2010 BMJ network meta-analysis places glucosamine/chondroitin on the empirical side.

Read the third-party testing discipline: buy only third-party-tested supplements; check the lot number on the certifier's website. The [27] Informed Sport program places this on the contamination-risk side; the [28] NSF Certified for Sport program places it on the US governance side; the [26] WADA Prohibited List places it on the doping-risk side.

Read the clinical-handoff: any supplement with a medical claim belongs to a clinician, not a coach; the rower on prescription medication asks the prescriber before stacking. The [22] Thomas/Erdman/Burke 2016 position stand places this on the canonical side; the [24] NIH ODS Iron Fact Sheet places it on the iron-medication-interaction side; the [25] NIH ODS Vitamin D Fact Sheet places it on the vitamin-D-medication-interaction side.

When the plan is working, the foundation is fixed, the supplement stack is small and third-party tested, the dose is right for the goal, and the medical-claim supplements are routed to a clinician. When the plan is not working, return to the foundation; the rower who fixes the foundation first rarely needs the supplement aisle. Supplements are a lever on an already-working foundation; the rower who fixes the foundation first rarely needs the supplement aisle at all.