Does protein timing (anabolic window) matter?
Reviewed and updated · Methodology
A 2013 meta-analysis by Schoenfeld et al. found no meaningful strength or hypertrophy benefit from narrow post-workout protein timing once total daily protein was matched.
If you trained fasted or have not eaten for 4+ hours before training, eating protein within a couple of hours post-workout is a reasonable hedge.
Pre-sleep casein (30–40 g) has some evidence for supporting overnight MPS and recovery when training volume is high.
Consistency beats timing. Missing your daily target by 30–50 g matters far more than any post-workout shake timing.
Do I need a shake immediately after the gym?
Not for most people. If your next meal is within a couple of hours and you have eaten protein in the prior 4 hours, plain food works fine. Shakes are convenient, not magical.
Is fasted training bad for muscle?
Not inherently, but back-to-back training sessions with long fasting windows and low daily protein will compromise gains. In that case, post-workout protein matters more.
- ISSN Position Stand: Protein and Exercise — Peer-reviewed consensus: 1.4–2.0 g/kg for active adults
- Morton et al., 2018 — Meta-analysis of protein supplementation & RET — Br J Sports Med: benefits plateau around 1.6 g/kg/day
- Schoenfeld & Aragon, 2018 — How much protein per meal? — Evidence for ~0.4 g/kg/meal across 4 meals
Nutrition data is verified against the product’s Nutrition Facts label and the brand’s official spec sheet. See our full ranking methodology for the scoring formula and inclusion rules.