Protein is necessary for muscle repair and growth.For this reason, many people consume protein supplements in the form of shakes along with their workouts.However, the optimal time to have a protein shake is a hotly debated topic.Some believe it’s best to drink a protein shake before a workout, whereas others argue that after a workout is ideal.This article explains whether it’s best to have a protein shake before or after your workout.
The Recommended Daily Allowance (RDA) for protein is 0.36 grams per pound (0.8 g/kg) of body weight (1).
The RDA is the estimated amount of a nutrient a person needs to avoid a deficiency. It doesn’t specify the amount needed to optimize body composition or health (2).
For protein, it’s clear that the RDA is much too low to support muscle recovery and growth (3, 4, 5, 6).
In fact, research suggests that people who routinely strength train may need double the RDA, or 0.72 grams per pound (1.6 g/kg), to support muscle recovery and growth (3, 7).
For a person weighing 150 pounds (68 kg), this equals 109 grams of protein per day.
To optimize your results, spread this amount over three to four meals that are consumed every three to four hours (8, 9).
A protein shake is a good option between meals, either as a snack or around your workout. They typically contain 25–30 grams of protein per scoop.
SUMMARYPeople who exercise regularly need more protein to support muscle recovery and growth. Consume your protein at equally spaced times throughout the day.
Does the “Anabolic Window” Matter?
Many people believe drinking a protein shake within 30 minutes of exercise will maximize their results in the gym.
This 30-minute window, commonly known as the “anabolic window,” is a short period of time in which your muscles are like a sponge for protein.
The thought is that if you consume protein outside of the anabolic window, your body won’t effectively utilize it or build muscle (10).
Research now suggests that this anabolic window of opportunity is much longer than 30 minutes and may not be limited to after exercise (11).
In fact, it may not matter if you drink a protein shake before or after your workout in terms of optimizing muscle repair and growth.
SUMMARYIt was previously believed that protein had to be consumed within 30 minutes of a workout for your body to use it. Recent research suggests that this may not be the case.
To date, only one study has compared the effects of consuming protein either before or after a workout on muscle strength and size.
The researchers split 21 men into two groups, both of which received a protein shake containing 25 grams of protein. One group received it immediately before their workout, while the other group received it immediately after (12).
Everyone completed a whole-body workout three times per week for 10 weeks.
Interestingly, the study found no significant differences in muscle strength or size between the groups. These results suggest that as long as you consume protein around your workout, it doesn’t matter if it’s before or after training.
Therefore, you can choose which time you prefer or is most convenient for you.
SUMMARYWhether you drink a protein shake before or after your workout may not have an effect on muscle strength or size.Daily Protein Intake May Be More Important
The research on whether protein intake around your workouts is important for maximizing gains is mixed.
Some research has questioned whether consuming protein around your workout is even necessary (11, 13).
A few studies suggest it’s beneficial, while other research shows no effect (14, 15, 16, 17).
These opposing results led researchers to analyze the findings of 23 studies on the effects of consuming protein around exercise (18).
They found that total protein intake was the strongest predictor of muscle strength and size, regardless of whether people consumed it close to their exercise or not.
Therefore, how much protein you consume per day is likely more important than when you consume it for gaining muscle size and strength.
SUMMARYThe total amount of protein you consume each day is more important for muscle growth and strength than the timing of when you eat it.