If guys who already lift weights drink a 20g protein shake after working out for 9 weeks, they’ll gain more muscle and get stronger—even if the protein is a mix of fast- and slow-digesting types.

If you're a guy who lifts weights, drinking a protein shake after your workout with different mixes of fast- and slow-digesting milk proteins — like whey and casein — gives you about the same muscle and strength gains, even if your body absorbs the amino acids differently.

If you're a guy who lifts weights, drinking a protein shake after your workout with different mixes of fast- and slow-digesting milk proteins — like whey and casein — gives you about the same muscle and strength gains, even if your body processes the amino acids differently.

For young guys lifting weights, eating 1.8 grams of protein per kilo of body weight each day is enough to gain muscle and get stronger in 10 weeks — it doesn’t matter if they take a 35g casein protein shake during the day or before bed.

If you're a guy who lifts weights, getting a bigger spike in amino acids after your workout doesn't actually help you gain more muscle or get stronger over time.

If female college athletes who already lift weights drink a protein shake with 24 grams of protein right before and after their workouts for eight weeks — while following a specific 4-day workout plan — they’ll likely gain about 1.4 to 1.5 kg of muscle and lose 1 to 2% body fat.