Recovery Supplements: What the Evidence Shows

Recovery supplements in three numbers

Three pooled figures set the scale for the whole category. One is the biggest protein meta-analysis, one is the tart cherry meta-analysis, and one is the ceiling above which more protein does nothing.

Study figures come from the 20 PubMed papers in the sources list. Doses are quoted as study conditions, not recommendations. Where a compound has only one trial, the text says so.

What this guide covers

What recovery supplements actually do

Training damages muscle fibres, raises inflammation and empties fuel stores. Recovery is the repair of all three, and recovery supplements target one of them each. Protein supplies the material for repair. Creatine refills the fastest energy system. The rest of the recovery supplements act on soreness, inflammation or sleep.

The best evidence now comes from an umbrella review of 53 meta-analyses covering 24 nutritional interventions and 10 recovery outcomes (PMID 37460208).

It found moderate certainty evidence for HMB and L-carnitine on creatine kinase and for BCAA on delayed onset soreness. Curcumin, ginseng, polyphenols and anthocyanins also reduced soreness (PMID 37460208).

Three things are worth noticing in that list of recovery supplements. The effects are on markers and soreness, not on strength or muscle gained. The compounds are cheap. And the two best muscle recovery supplements, protein and creatine, are missing, because they are studied for adaptation rather than soreness.

So the honest frame for supplements for recovery is two tiers. Protein and creatine change what you build over months. The anti-inflammatory and sleep compounds change how you feel over the next 72 hours.

Protein: the supplement with 1863 people behind it

The largest meta-analysis of recovery supplements pooled 49 studies and 1863 people doing resistance training with or without protein supplementation (PMID 28698222).

Protein added 2.49 kg to one repetition maximum strength and 0.30 kg of fat free mass over placebo. Muscle fibre cross sectional area grew 310 square micrometres more (PMID 28698222).

The gain was larger in trained people, an extra 0.75 kg of fat free mass, and smaller with age. Above a total intake of 1.62 g per kg per day, more protein added nothing (PMID 28698222).

Timing matters less than total for recovery supplements. A meta-analysis of 23 studies looked at protein timing. Once total intake was controlled, timing around the session had no significant effect on strength or hypertrophy (PMID 24299050).

One timing window does have its own data. Casein taken before sleep was digested overnight. Whole body protein synthesis rose from 246 to 311 micromoles per kg over 7.5 hours, and a negative net balance turned positive (PMID 22330017).

Omega-3 fats may raise the response to protein. Eight weeks of fish oil increased the muscle protein synthesis response to insulin and amino acids from 0.062 to 0.083 percent per hour (PMID 21501117).

Creatine: adaptation, not soreness

Creatine is the most studied of all recovery supplements, and almost none of that study is about soreness. It is about the work you can do in the next session, which is the other half of recovery.

Across 22 studies, creatine plus resistance training raised strength 8 percent more than placebo plus training, 20 against 12 percent. Weightlifting performance rose 14 percent more, 26 against 12 percent (PMID 14636102).

The range was wide. Bench press one repetition maximum gains ran from 3 to 45 percent, and the authors called the response highly variable (PMID 14636102).

That variability is why some people call creatine useless among post workout recovery supplements. Responders refill phosphocreatine faster between sets and sessions; non responders already have full stores from diet.

Creatine did not appear in the umbrella review of damage markers. The trials that qualify measure strength and mass rather than creatine kinase (PMID 37460208).

Tart cherry: moderate effect on strength recovery, small on soreness

Tart cherry is the best studied of the anthocyanin recovery supplements, and the two meta-analyses agree on the shape of the effect.

Across 14 studies, tart cherry had a small effect on soreness, effect size 0.44. Strength recovery showed a moderate effect at 0.78 and power 0.53. Jump height recovery showed a large effect at 0.82 (PMID 33440334).

C-reactive protein and interleukin-6 fell by small effect sizes, 0.46 and 0.35. Creatine kinase and TNF-alpha did not change (PMID 33440334).

A 2026 meta-analysis of 19 trials found the same pattern. Maximal strength recovered better at every time point and C-reactive protein fell for 48 hours. Soreness, creatine kinase and interleukin-6 showed no pooled effect (PMID 41945263).

The trial that started the interest in tart cherry as a recovery supplement followed marathon runners. Isometric strength recovered faster on cherry juice, inflammation markers were lower, and total antioxidant status was about 10 percent higher (PMID 19883392).

Function recovers; the soreness number barely moves. That is a useful result, because function is what decides whether you can train tomorrow.

Omega-3: a real effect that is too small to feel

Omega-3 fats are sold as the anti-inflammatory choice among recovery supplements, and the meta-analysis shows why that claim is both true and overstated.

Across 12 randomised trials, 145 people on omega-3 against 156 controls, soreness after eccentric exercise fell 0.93 points on a 10 point scale (PMID 32382573).

The threshold for a difference a person can notice is 1.4 points on that scale. The pooled effect sat below it, and neither isometric strength nor range of motion improved (PMID 32382573).

The authors graded the evidence low quality and concluded that omega-3 does not produce a clinically important reduction in soreness (PMID 32382573).

The stronger omega-3 result is elsewhere. In healthy adults, eight weeks of fish oil raised the anabolic response to amino acids and insulin. Muscle protein concentration and cell size were greater afterwards (PMID 21501117).

BCAA, HMB and curcumin: the damage marker supplements

Three recovery supplements have meta-analyses on creatine kinase, lactate dehydrogenase and soreness after a damaging session. None of them has comparable data on muscle gained.

BCAA reduced delayed onset soreness with an effect size of 0.73 across 8 studies and 61 participants. The authors called that a large decrease (PMID 30938579).

A later review of 10 trials narrowed that. BCAA blunted soreness at 24 to 72 hours in trained people with mild to moderate damage. It worked only when taken before and after the session, not after alone (PMID 34669012).

In trained men, BCAA lowered creatine kinase at under 24, 24 and 48 hours and soreness at under 24 hours only. Lactate dehydrogenase did not change (PMID 34072718).

HMB lowered creatine kinase by 60.7 units per litre and lactate dehydrogenase by 15.4 across 10 and 8 studies. The effect was significant only in protocols over six weeks (PMID 29676656).

Curcumin reduced soreness by a mean difference of 0.61 and creatine kinase by 137 units per litre. The soreness effect did not depend on dose or training status (PMID 39008500).

Sources for the table: PMID 30938579, 34072718, 29676656, 39008500, 33440334, 32382573.

Sleep, magnesium and ashwagandha

Sleep is the recovery variable with the largest effect, and no recovery supplements are needed for it. Collegiate basketball players who extended sleep by 111 minutes a night cut their sprint time from 16.2 to 15.5 seconds (PMID 21731144).

Free throw accuracy rose 9 percent and three point accuracy 9.2 percent in the same study. Daytime sleepiness fell and mood scores improved (PMID 21731144).

Among recovery supplements aimed at sleep, a meta-analysis of 31 trials found significant gains in subjective sleep quality for amino acids, melatonin and vitamin D. Magnesium and zinc did not have enough data to pool (PMID 33441476).

Magnesium has its own small meta-analysis in older adults with insomnia. Sleep onset came 17.4 minutes sooner across three trials and 151 people. Total sleep time was up 16 minutes but not significant (PMID 33865376).

For athletes the magnesium question is intake. Below about 260 mg a day in men, status can become deficient, and supplementation helps performance only in people who were deficient (PMID 17172008).

Ashwagandha has one well known trial. Over eight weeks, 57 men gained 46 kg on bench press against 26.4 kg on placebo. Creatine kinase rose less after exercise and testosterone rose 96 ng per dL (PMID 26609282).

That is one trial from one group, and it has not been replicated at that size. The KSM-66 guide covers the rest of the literature.

Eight recovery supplements ranked by what the trials measured

This ranking of the best supplements for muscle recovery orders the recovery supplements by the size and quality of their evidence, not by popularity. Tier one changes what you build. Tier two changes how the next three days feel.

Sources for the table: PMID 28698222, 14636102, 33440334, 41945263, 29676656, 30938579, 39008500, 32382573, 33865376.

Ashwagandha is not ranked because it rests on one trial (PMID 26609282). Sleep extension is not ranked because it is not a supplement, and it beat all of them (PMID 21731144).

Five recovery supplement mistakes the trials rule out

Verdict: recovery supplements in 20 studies

1. Protein powder works when the day is short. +2.49 kg strength, no gain above 1.62 g per kg (PMID 28698222).

2. Timing is a rounding error. No effect once total intake is controlled (PMID 24299050).

3. Pre-sleep casein is the one window with data. Synthesis 246 to 311 micromoles per kg overnight (PMID 22330017).

4. Creatine restores the next session. Strength +8 percent over placebo, highly variable (PMID 14636102).

5. Tart cherry brings strength back, not comfort. ES 0.78 for strength, 0.44 for soreness (PMID 33440334, 41945263).

6. Omega-3 soreness effect is below the noticeable line. 0.93 against 1.4 (PMID 32382573).

7. BCAA, HMB and curcumin move blood markers. CK down 60.7 and 137 U/L; soreness ES 0.73 (PMID 29676656, 39008500, 30938579).

8. The umbrella review backs the marker tier of recovery supplements at moderate certainty. 53 meta-analyses, 24 interventions (PMID 37460208).

9. Sleep extension beat every one of the recovery supplements. Sprint 16.2 to 15.5 seconds, accuracy +9 percent (PMID 21731144).

10. Magnesium helps the deficient and the sleepless. 17.4 minutes faster sleep onset; no performance gain if replete (PMID 33865376, 17172008).