Caffeine is the best-supported ergogenic aid in rowing, full stop. A 2023 network meta-analysis of 71 rowing studies ranked it the top acute nutritional intervention. In elite rowers, 3 mg/kg improved six-minute maximal performance, with the benefit landing in the final four to six minutes, right where a race is won. The effective dose is 3 to 6 mg/kg. His 300 to 400 mg lands around 3.5 to 4.5 mg/kg for an open-weight rower. That is inside the range, not above it.

Not the kidneys. Large cohorts tie habitual coffee intake to lower rates of chronic kidney disease and stones, not higher. The honest chronic problems are tolerance, dependence, dose creep, and wrecked sleep, which is itself performance-limiting. The failure mode is not organ damage. It is needing more next year to feel the same thing.

Bicarbonate buffers acid in the space outside the cell, and 0.3 g/kg is the best-supported dose. It earns its keep in short, maximal, acidosis-limited efforts. The catch is that the one trial testing it head to head in elite rowers found no benefit from bicarbonate alone. It did not blunt caffeine, but it did not add anything either.

This is the one I would reconsider. The rowing-specific benefit is the weakest of the three, and the chronic cost is the most tangible. It is a recurring sodium and alkali load, and controlled data show it can nudge up diastolic blood pressure and drive volume expansion. My instinct was to worry about stones. That instinct was wrong. Alkalinizing the urine is how we prevent uric acid and cystine stones, so bicarbonate is neutral to protective there. The blood pressure and volume effects are the real story.

Beta-alanine raises intramuscular carnosine, a buffer that works inside the cell. It is genuinely ergogenic for efforts of one to four minutes, and 2000 meter rowing is one of the events with strong evidence behind it. A meta-analysis in trained young men found the effect strongest for four to ten minute efforts at higher daily doses. It works on accumulated dose over weeks, not on a race-day pill.

Almost none, which is the surprise. A risk assessment across 101 human and 50 animal studies found paresthesia, the harmless tingle after a big single dose, as the only adverse effect. No dropouts, no meaningful liver signal, no taurine depletion. The only real downside is commitment. It does nothing until you have taken it daily for four weeks, so it is a standing habit rather than a tool.