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Whey protein before or after a workout?
Short answer: Either works. The idea that you must drink your shake within a short window after training is graded myth for healthy adults who eat enough protein. In trials that compared the same protein dose before vs after training, gains in lean mass were the same. Hitting your daily protein total matters more than the clock.
TakeItWhen grade: myth
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Common questions
What did the direct comparisons find?
A 2025 meta-analysis pooled 5 studies that randomized people to protein before or after each session for at least 4 weeks. Lean body mass did not differ, and chest-press strength did not differ. Leg-press strength was slightly higher with protein before training, but the authors say more research is needed.
Is there a 30-minute window after training?
Not a narrow one. In 21 trained men, 25 g protein right before or right after lifting, 3 times a week for 10 weeks, gave similar results on every measure. The authors wrote the window "may be as wide as several hours or perhaps more", depending on when you last ate.
What matters more than timing?
Total protein. A review of 49 trials (1,863 people) found protein supplements helped muscle size and strength during training, with no further gain in fat-free mass above about 1.6 g per kg of body weight per day. A separate review of 65 trials found no benefit from any specific timing.
Does this apply to older adults?
Mostly, with one caveat. In 30 untrained older men training for 12 weeks, 40 g protein after exercise or before sleep added nothing over training alone when they already ate at least 1.0 g/kg a day. But an older, smaller study in 13 men aged about 74 found protein right after training built more muscle than protein 2 hours later. If you are older, having protein soon after training is a reasonable habit.
Sources
- Casuso & Goossens 2025, Nutrients (PMID 40647175, doi:10.3390/nu17132070)
- Schoenfeld 2017, PeerJ (PMID 28070459, doi:10.7717/peerj.2825)
- Morton 2018, Br J Sports Med (PMID 28698222, doi:10.1136/bjsports-2017-097608)
- Wirth 2020, J Nutr (PMID 32232404, doi:10.1093/jn/nxaa049)
- Klemp 2025, J Int Soc Sports Nutr (PMID 40539259, doi:10.1080/15502783.2025.2519511)
- Esmarck 2001, J Physiol (PMID 11507179, doi:10.1111/j.1469-7793.2001.00301.x)
How we grade: strong consistent human trials, moderate some human trials, weak limited or indirect evidence, myth evidence says no. This is general information, not medical advice. If you take a prescription medicine, ask your doctor or pharmacist.
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