Does protein timing build more muscle? A plain look at the research for lifters who want a simple routine.
Most lifters can stop sprinting to the locker room for a shake. Timing is a fine-tuning step, and the research puts it well behind how much protein you eat in a day.
What the research says about timing
A meta-analysis of 23 hypertrophy studies found that total protein intake was the strongest predictor of muscle gain. Once the authors accounted for it, protein timing around workouts showed no significant effect on size or strength.
A 10-week trial in 21 trained men compared 25 g of whey right before training with 25 g right after. Results were similar, and the authors concluded the window for protein may be several hours wide.
Key takeaway: Hit your daily protein first. Treat timing as a tiebreaker.
What to do with that
- Aim for the daily number. The ISSN position stand suggests 1.4–2.0 g per kg of body weight a day for people who train. A larger meta-analysis found gains from protein supplements leveled off near 1.6 g/kg a day.
- Split it up. The same position stand suggests doses of about 20–40 g, spread every 3–4 hours.
- Don’t sweat the training window. The anabolic effect of a workout lasts at least 24 hours, so a shake before or after training both work.
Protein before bed
The ISSN position stand says 30–40 g of casein, a slow-digesting milk protein, before sleep raises overnight muscle protein synthesis. A 2020 review suggests at least 40 g about 30 minutes before sleep, after an evening workout, “might be” a useful recovery habit. If a bedtime shake keeps you up, skip it.
Making it a routine
Regular protein is easier when you don’t have to think about it. Proteinly’s automatic eating timer reminds you to eat every 2 hours, which helps with consistency and keeps long gaps from ending in cravings. It’s a habit tool; we don’t claim the schedule itself builds extra muscle.
For more on spreading protein out, see Protein Needs After 40: How Much and How to Spread It.
Frequently asked questions
Do I need protein within 30 minutes of training?
No. The pre- versus post-workout trial above found no difference, and the authors argue the window is far wider than 30 minutes.
Is casein before bed worth it?
It may help recovery, per the 2020 review, but the evidence is early. Make sure your daily total is covered first.
Does it matter if I eat less than 20 g in one meal?
Not much, if your day adds up. The 20–40 g range is a guide from the ISSN position stand, not a hard rule.
Next steps
Set a daily target near 1.6 g/kg, split it into a few meals, and don’t worry about the clock around your workout. Build the habit with the Proteinly app, and follow along on YouTube, Instagram and TikTok. Learn more about Proteinly or browse more articles.