New research reveals surprising results!

When it comes to post-workout nutrition, one of the most common questions I get is: “How much protein should I eat after I train?”

Most fitness advice recommends consuming 20 grams of high-quality protein after resistance exercise to optimize muscle recovery. But here’s the catch: that number is based mostly on studies in men. So does the same rule apply to women?

A new study just looked into this exact question—and the results may change how you think about your post-workout shake.

What the science says about post-workout protein for women

We know that resistance training and dietary protein both stimulate muscle protein synthesis (MPS)—the process your body uses to build and repair muscle. But how much protein is needed to trigger this effect?

In men, research shows muscle protein synthesis plateaus at about 20 grams of high-quality protein. Anything more doesn’t necessarily add benefit. But women tend to have less muscle mass, so their needs might be different.

This new study set out to test exactly that.

Study design: Protein & recovery in active females

Researchers recruited 28 healthy, recreationally active women (ages 18–24) to complete a resistance training session—specifically, unilateral leg presses and extensions performed to failure.

Immediately afterward, participants were randomly assigned one of three post-workout drinks:

• 1.5g of essential amino acids (EAA) with 6g of leucine
• 15g of whey protein
• 20g of whey protein

The goal? To compare the effects of different protein doses on post-exercise muscle protein synthesis over a 4-hour recovery period.

The results: Is 20g really necessary?

All three groups experienced a significant increase in muscle protein synthesis compared to rest. But here’s the kicker:

There were no significant differences in muscle protein synthesis between the groups at any point post-exercise.

That means whether the women drank a 1.5g EAA shake, 15g of whey, or 20g of whey, the muscle-building response was essentially the same.

Key implications:

• Smaller protein doses may be sufficient for women
• Leucine content (around 1g) is likely more important than total protein
• The 20g rule may be more than necessary for young, active females

What this means for your recovery strategy

This study supports the idea that more isn’t always better, especially for women with lower muscle mass.

Here’s what I recommend:

• Focus on total daily protein intake—that’s still your #1 priority
• After workouts, aim for ~15g of high-quality protein or a dose with ~1g of leucine
• Check your post-workout shake ingredients to ensure you’re covering leucine

Want more tips like this? Check out our FREE RESOURCES and explore the macro-friendly recipes on the blog to help you fuel smarter and recover stronger.

Bottom line

If you’re a young, active woman, your body might not need a full 20g of protein immediately after training. A smaller protein dose—or even an essential amino acid supplement with enough leucine—can still do the job.

And remember: post-workout protein is important, but the real gains happen when your total daily intake supports your goals.

💬 Have questions? Drop them in the comments or DM me on Instagram @hollytbaxter. I’d love to hear how you’re adjusting your routine based on the latest research!