Supplements · Diets
Do ketone sports supplements boost athletic performance?
The claim, precisely: exogenous ketones improves exercise performance
No — pooled trials find no benefit, and the famous positive study didn't replicate.
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: All trials, pooled (Meta-analysis)
How the studies fall
What the evidence shows
The marketed 'ketones boost athletic performance' claim is NET NULL across meta-analyses; the famous positive Oxford trial is from the ester's patent-holders and failed independent replication, and ketone ester even causes a mild acidosis that offsets benefit.
The evidence (5)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| (SR 10 studies) 2020 · (SR) | meta-analysis | mixed | moderate | [FT-verified] Margolis2020 10 studies/16 outcomes 3pos/10null/3neg; I2 83-93%; 109/112 male; no consistent ergogenic effect |
| Valenzuela PL, et al. 2020 · (MA) | meta-analysis | contradicts | moderate | MA of RCTs: no significant ergogenic effect on performance |
| (SR 10 studies) 2020 · (SR) | meta-analysis | tested-null | moderate | SR 10 studies: 3 positive, 10 null, 3 negative; net null, severe heterogeneity |
| Brooks 2022 · Int J Sport Nutr Exerc Metab | meta-analysis | contradicts | high | [FT-verified] Brooks2022 8RCTs n=80 endurance g=0.136 (CI -0.195,0.467) p=.42; TTE&TT null; 77/80 male |
| Valenzuela PL, et al. 2020 · (MA) | meta-analysis | contradicts | high | [FT-verified] Valenzuela2020 13RCTs overall g=-0.05 (CI -0.30,0.20) p=.68; null endurance/esters/salts |
Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.