The Claim

In healthy young adults, ingestion of free amino acids results in a greater postprandial increase in plasma insulin concentration compared to an equivalent amount of intact milk protein, with peak insulin levels of 35 ± 15 mU/L and 24 ± 9 mU/L, respectively.

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.

Quantitative
1 study reviewed
In plain English

If you drink free amino acids, your insulin spikes more after the meal than if you drink the same amount of protein from milk — 35 vs 24 units on average.

See the scientific wording

Free amino acid ingestion leads to a greater postprandial rise in plasma insulin concentration compared to an equivalent amount of intact milk protein in healthy young adults, with peak insulin levels reaching 35 ± 15 mU/L versus 24 ± 9 mU/L, respectively.

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 shows that taking amino acids in powder form gives your body a faster boost of building blocks than drinking milk protein, which usually leads to a bigger insulin spike—just like the claim says.

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.