Whey Protein for Exercise Recovery
Whey protein can speed the return of muscle strength and lower markers of muscle damage after hard training, but it does not reliably reduce muscle soreness, and the overall evidence is weak and inconsistent.
Why this grade7-layer evidence engine
Two systematic reviews anchor the case for a real but limited benefit. A 2018 review (PMID 29462923) found small-to-medium gains in the recovery of muscle function in the days after resistance training, yet only about half of the individual trials showed an independent effect. A 2022 review (PMID 36513777) found protein significantly preserved maximal voluntary contraction at 96 hours and lowered creatine kinase at 72 hours, but reported no significant effect on delayed-onset muscle soreness at any timepoint.
The randomized trials are split. One trial (PMID 32784847) showed whey blunted creatine kinase and myoglobin after eccentric exercise versus water, but it was partly industry-funded and whey was no better than pea protein. A smaller trial in already resistance-trained men (PMID 32245197) found no effect on muscle protein synthesis or any recovery measure, hinting that well-trained, well-fed athletes may gain little.
Authorities are mixed, which keeps this at a weak C grade. The US FDA treats whey as generally recognized as safe but makes no efficacy claim, and Mayo Clinic endorses it as a sound post-exercise protein source. The UK NHS is cautious, noting most non-elite people are unlikely to benefit and that excess protein strains the kidneys. Because several supportive studies carry industry funding and the soreness benefit is unproven, the claim is published with a warning rather than upgraded.
Scoring transparency
All scores computed by a 7-layer evidence engine — fully auditable▸View the full decision path (audit trail)
- compute_raw_score — 加權公式: L2×0.30 + L3×0.25 + L5×0.25 + L11×0.10 + L1×0.10 = 0.522
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高品質 SR/MA 顯示 positive (1 篇 > 0 negative)
- tier_strict_requirement_check — Tier 條件達標，未降階
- detect_disputes — 偵測到 0 個 hard + 1 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status