The Claim

In healthy young adults, consuming 30 grams of free amino acids does not result in a greater increase in mixed muscle protein synthesis rates compared to consuming an equivalent amount of intact milk protein during a 6-hour postprandial period, even though plasma amino acid availability is higher with free amino acids.

Source: Ingestion of Free Amino Acids Compared with an Equivalent Amount of Intact Protein Results in More Rapid Amino Acid Absorption and Greater Postprandial Plasma Amino Acid Availability Without Affecting Muscle Protein Synthesis Rates in Young Adults in a Double-Blind Randomized Trial

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
80score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

How it works
1 study reviewed
In plain English

If you're a healthy young adult, drinking a supplement with 30 grams of broken-down amino acids won't help your muscles grow more than drinking the same amount from real milk protein—even though your body absorbs the amino acids faster.

See the scientific wording

In healthy young adults, ingestion of 30 grams of free amino acids does not increase mixed muscle protein synthesis rates more than an equivalent amount of intact milk protein over a 6-hour postprandial period, despite greater plasma amino acid availability.

What the research says

1 study
  1. Study: Ingestion of Free Amino Acids Compared with an Equivalent Amount of Intact Protein Results in More Rapid Amino Acid Absorption and Greater Postprandial Plasma Amino Acid Availability Without Affecting Muscle Protein Synthesis Rates in Young Adults in a Double-Blind Randomized Trial

    The study found that even though free amino acids led to higher levels of amino acids in the blood, they didn’t build more muscle protein than drinking milk protein in young adults over 6 hours.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.