Recovery Supplements: What the Evidence Supports

Protein is the best-supported recovery supplement, followed by creatine, tart cherry and curcumin. Omega-3, beetroot, caffeine, BCAAs and collagen have limited or narrow recovery evidence. Olive polyphenols have almost no direct recovery data yet. Below, each one gets an A to D grade based on human trials, with the main caveat for each.

How we graded the evidence

Each grade reflects human evidence for recovery, not for general health or performance. We used meta-analyses and position stands where they exist, and single trials where they do not.

• A: consistent benefit across meta-analyses or expert position stands.
• B: pooled trials show a benefit, but the trials are small, varied or of modest quality.
• C: a few small trials, mixed results, or benefits limited to blood markers.
• D: little or no direct human evidence for recovery.

The International Olympic Committee puts it plainly. Supplements make at most a minor contribution. Only a few have good performance evidence: caffeine, creatine, specific buffering agents and nitrate (Maughan et al., 2018). Food, sleep and training load come first. Our guide to olive oil for athletic performance and recovery sets out that foundation.

Recovery supplements graded A to D

Supplement	Recovery grade	Best evidence for	Main caveat
Protein	A	Muscle repair, keeping strength after damage	Does not reduce soreness
Creatine	B	Strength recovery between hard bouts	Mixed for endurance; adds body mass
Tart cherry	B	Strength recovery, small drop in soreness	Best for short, intense periods
Curcumin	B	Soreness and creatine kinase	Small trials, varied products
Omega-3	C	Lower muscle damage markers in blood	Markers are not performance
Caffeine	C (A for performance)	Glycogen refill with carbohydrate	Dose studied is high and hurts sleep
Beetroot / nitrate	C (A for endurance performance)	Soreness and jump recovery in one trial	Recovery data are thin
BCAAs	C	Soreness in small trials	Redundant if protein intake is adequate
Collagen	C	Collagen synthesis markers; jump recovery	Soreness effect not significant
Olive polyphenols	D	Modest antioxidant marker changes	No soreness or strength outcomes yet

What is the best supplement for muscle recovery?

Protein, and it is the only grade A on the list. The ISSN recommends 1.4–2.0 g of protein per kg of body weight a day for most exercising people (Jäger et al., 2017). It suggests 20–40 g per serving, spread every three to four hours. Endurance athletes should prioritise carbohydrate, and added protein may help offset muscle damage.

Protein's effect is on repair, not on comfort. A 2023 meta-analysis found that protein around resistance exercise helped preserve maximal strength and lowered creatine kinase (Pearson et al., 2023). It had no effect on muscle soreness. Food covers most needs. Powder is a convenience, not a requirement.

Creatine: B for recovery

Creatine is among the most studied supplements in sport. The ISSN position stand reports that it may enhance post-exercise recovery and help athletes tolerate heavy training loads (Kreider et al., 2017). It also describes supplementation as safe in healthy people in studies lasting up to five years.

A later review found that creatine may speed recovery between bouts of intense exercise (Wax et al., 2021). The same review noted contradictory findings for endurance exercise. It also flagged events where extra body mass could hurt performance. For a climber on a bike, that matters.

Tart cherry juice for recovery: B

Tart cherry is the best-studied polyphenol food for recovery. A meta-analysis of 14 studies found a small reduction in soreness and a moderate benefit for strength recovery (Hill et al., 2021). It also found small reductions in C-reactive protein and IL-6. Creatine kinase did not change.

A fruit polyphenol review suggested over 1,000 mg of polyphenols a day, for three or more days around hard exercise (Bowtell and Kelly, 2019). That fits stage races, camps and tournaments better than daily use. See the antioxidant caveat below.

Curcumin: B

Two meta-analyses agree on direction. One found that curcumin lowered creatine kinase and a muscle soreness index (Fang and Nasir, 2021). A second, with 10 trials, found lower soreness, creatine kinase and TNF-α, plus better strength and range of motion (Beba et al., 2022). The trials were small, and products varied widely. The authors called for larger, better-designed studies.

Omega-3: C

A 2021 meta-analysis found that omega-3 supplements reduced creatine kinase, lactate dehydrogenase and myoglobin after muscle-damaging exercise (Xin and Eshaghi, 2021). Those are blood markers of muscle damage. The analysis did not establish faster return of strength or performance. If you already take fish oil, see taking olive polyphenols and omega-3 together.

Caffeine: A for performance, C for recovery

Caffeine improves endurance performance at 3–6 mg per kg of body mass, according to the ISSN (Guest et al., 2021). Recovery is a narrower story. In seven trained athletes cycled to exhaustion, caffeine at 8 mg/kg plus carbohydrate raised glycogen resynthesis by 66% over four hours (Pedersen et al., 2008).

That dose is close to the 9 mg/kg level the ISSN links with frequent side effects. The ISSN also notes effects on sleep. Caffeine after an evening session may cost more recovery than it gains.

Beetroot and nitrate: A for endurance, C for recovery

Nitrate is one of the few supplements the IOC rates as having good performance evidence (Maughan et al., 2018). Recovery evidence is thinner. In one trial, 30 men drank beetroot juice or placebo after 100 drop jumps (Clifford et al., 2016). The high-dose group regained jump height faster and had higher pain thresholds. Strength and inflammatory markers did not change. Our article on beetroot nitrates and olive polyphenols covers the performance doses.

BCAAs: C

A meta-analysis of 8 studies found that BCAAs reduced soreness after exercise (Fedewa et al., 2019). Only 61 participants were involved. A separate review found no human study showing that oral BCAAs alone stimulate muscle protein synthesis (Wolfe, 2017). Complete protein supplies BCAAs plus the other essential amino acids. If you eat enough protein, BCAAs add little.

Collagen: C

Collagen is more about connective tissue than muscle. In eight men, 15 g of vitamin C-enriched gelatin before skipping doubled a blood marker of collagen synthesis (Shaw et al., 2017). In 24 men, 20 g a day of collagen peptides sped jump recovery after drop jumps (Clifford et al., 2019). Soreness was not significantly different from placebo, and inflammation markers did not change.

Olive polyphenols: D

We make olive polyphenol products, so we hold this grade to the same standard. One randomised trial gave 29 active adults a hydroxytyrosol-rich olive fruit water extract for 16 days (Roberts et al., 2022). It found modest antioxidant changes after a hard session. It did not measure soreness, strength or performance. That extract is a different product from Pomoni's.

The mechanisms are plausible, and we explain them in olive polyphenols for strength training. Until a trial measures recovery directly, D is the honest grade. The one authorized EU claim concerns blood lipids, not muscles. Olive oil polyphenols contribute to the protection of blood lipids from oxidative stress. The effect is obtained with a daily intake of 20 g of olive oil containing at least 5 mg of hydroxytyrosol and its derivatives (European Commission, 2012).

Can antioxidant supplements blunt training adaptations?

Yes, at high doses. Oxidative stress during exercise is part of the signal that tells muscle to adapt. In a study of rats and 14 men, 1 g a day of vitamin C hampered endurance training adaptations (Gomez-Cabrera et al., 2008). In another, 54 people took 1,000 mg of vitamin C and 235 mg of vitamin E daily for 11 weeks (Paulsen et al., 2014). Markers of new mitochondria rose in the placebo group but not in the vitamin group. VO2max and running performance improved equally in both groups.

A third trial found that vitamins C and E blocked exercise-induced gains in insulin sensitivity (Ristow et al., 2009). These were high-dose vitamins, not foods. The practical lesson still applies to any recovery product. Use the strongest anti-soreness tools for races and stacked hard days, not after every session in a building block. Our physician's guide to anti-inflammatory recovery covers this balance.

What should drug-tested athletes know?

Contamination is a real risk. The IOC consensus warns that some supplements contain prohibited substances, which can cause an anti-doping rule violation (Maughan et al., 2018). It advises trialling any product in training first and seeking expert advice. Choose products that publish batch test results, and check what each test actually covers.

If you want olive polyphenols as part of a daily diet, Phenolia Daily provides 12 mg of olive polyphenols in two capsules. It combines powdered high-phenolic olive oil, olive leaf extract and Greek Mountain Tea, with 60 capsules per box.

Sources

1. Maughan RJ, Burke LM, Dvorak J, et al. IOC consensus statement: dietary supplements and the high-performance athlete. British Journal of Sports Medicine. 2018;52(7):439–455. doi.org/10.1136/bjsports-2018-099027
2. Jäger R, Kerksick CM, Campbell BI, et al. International Society of Sports Nutrition position stand: protein and exercise. Journal of the International Society of Sports Nutrition. 2017;14:20. doi.org/10.1186/s12970-017-0177-8
3. Pearson AG, Hind K, Macnaughton LS. The impact of dietary protein supplementation on recovery from resistance exercise-induced muscle damage: a systematic review with meta-analysis. European Journal of Clinical Nutrition. 2023;77(8):767–783. doi.org/10.1038/s41430-022-01250-y
4. Kreider RB, Kalman DS, Antonio J, et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. Journal of the International Society of Sports Nutrition. 2017;14:18. doi.org/10.1186/s12970-017-0173-z
5. Wax B, Kerksick CM, Jagim AR, et al. Creatine for exercise and sports performance, with recovery considerations for healthy populations. Nutrients. 2021;13(6):1915. doi.org/10.3390/nu13061915
6. Hill JA, Keane KM, Quinlan R, Howatson G. Tart cherry supplementation and recovery from strenuous exercise: a systematic review and meta-analysis. International Journal of Sport Nutrition and Exercise Metabolism. 2021;31(2):154–167. doi.org/10.1123/ijsnem.2020-0145
7. Bowtell J, Kelly V. Fruit-derived polyphenol supplementation for athlete recovery and performance. Sports Medicine. 2019;49(Suppl 1):3–23. doi.org/10.1007/s40279-018-0998-x
8. Fang W, Nasir Y. The effect of curcumin supplementation on recovery following exercise-induced muscle damage and delayed-onset muscle soreness: a systematic review and meta-analysis of randomized controlled trials. Phytotherapy Research. 2021;35(4):1768–1781. doi.org/10.1002/ptr.6912
9. Beba M, Mohammadi H, Clark CCT, Djafarian K. The effect of curcumin supplementation on delayed-onset muscle soreness, inflammation, muscle strength, and joint flexibility: a systematic review and dose-response meta-analysis of randomized controlled trials. Phytotherapy Research. 2022;36(7):2767–2778. doi.org/10.1002/ptr.7477
10. Xin G, Eshaghi H. Effect of omega-3 fatty acids supplementation on indirect blood markers of exercise-induced muscle damage: systematic review and meta-analysis of randomized controlled trials. Food Science and Nutrition. 2021;9(11):6429–6442. doi.org/10.1002/fsn3.2598
11. Guest NS, VanDusseldorp TA, Nelson MT, et al. International Society of Sports Nutrition position stand: caffeine and exercise performance. Journal of the International Society of Sports Nutrition. 2021;18(1):1. doi.org/10.1186/s12970-020-00383-4
12. Pedersen DJ, Lessard SJ, Coffey VG, et al. High rates of muscle glycogen resynthesis after exhaustive exercise when carbohydrate is coingested with caffeine. Journal of Applied Physiology. 2008;105(1):7–13. doi.org/10.1152/japplphysiol.01121.2007
13. Clifford T, Bell O, West DJ, Howatson G, Stevenson EJ. The effects of beetroot juice supplementation on indices of muscle damage following eccentric exercise. European Journal of Applied Physiology. 2016;116(2):353–362. doi.org/10.1007/s00421-015-3290-x
14. Fedewa MV, Spencer SO, Williams TD, et al. Effect of branched-chain amino acid supplementation on muscle soreness following exercise: a meta-analysis. International Journal for Vitamin and Nutrition Research. 2019;89(5-6):348–356. doi.org/10.1024/0300-9831/a000543
15. Wolfe RR. Branched-chain amino acids and muscle protein synthesis in humans: myth or reality? Journal of the International Society of Sports Nutrition. 2017;14:30. doi.org/10.1186/s12970-017-0184-9
16. Shaw G, Lee-Barthel A, Ross ML, et al. Vitamin C-enriched gelatin supplementation before intermittent activity augments collagen synthesis. American Journal of Clinical Nutrition. 2017;105(1):136–143. doi.org/10.3945/ajcn.116.138594
17. Clifford T, Ventress M, Allerton DM, et al. The effects of collagen peptides on muscle damage, inflammation and bone turnover following exercise: a randomized, controlled trial. Amino Acids. 2019;51(4):691–704. doi.org/10.1007/s00726-019-02706-5
18. Roberts JD, Lillis JB, Pinto JM, et al. The impact of a natural olive-derived phytocomplex (OliPhenolia) on exercise-induced oxidative stress in healthy adults. Nutrients. 2022;14(23):5156. doi.org/10.3390/nu14235156
19. Gomez-Cabrera MC, Domenech E, Romagnoli M, et al. Oral administration of vitamin C decreases muscle mitochondrial biogenesis and hampers training-induced adaptations in endurance performance. American Journal of Clinical Nutrition. 2008;87(1):142–149. doi.org/10.1093/ajcn/87.1.142
20. Paulsen G, Cumming KT, Holden G, et al. Vitamin C and E supplementation hampers cellular adaptation to endurance training in humans: a double-blind, randomised, controlled trial. Journal of Physiology. 2014;592(8):1887–1901. doi.org/10.1113/jphysiol.2013.267419
21. Ristow M, Zarse K, Oberbach A, et al. Antioxidants prevent health-promoting effects of physical exercise in humans. Proceedings of the National Academy of Sciences. 2009;106(21):8665–8670. doi.org/10.1073/pnas.0903485106
22. European Commission. Commission Regulation (EU) No 432/2012 establishing a list of permitted health claims made on foods. 2012. eur-lex.europa.eu