Research
Micronutrients & recovery
High concentrations of specific free amino acids (glutamine, tryptophan) are consistently present in both whey and plant-based protein powders.
You can expect both whey and plant protein powders to be rich sources of glutamine and tryptophan.
ModerateSupportsMEDIUM confidence
The amino acids like glutamine and L-tryptophan were consistently high-ranking in most species of whey and plant-based proteins investigated.
Why this rating
Based on chemical analysis of products, not clinical trials.
Source
Quantitative LC-MS/MS Determination of Source-Specific Variations of Underivatized Free Amino Acids in Protein Powders
C. Ranjani et al. · Asian Journal of Chemistry · 2025
DOI 10.14233/ajchem.2025.34190
mechanism_only · n=18
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- Whey protein powders contain significantly higher concentrations of sweet-tasting free amino acids (glycine, alanine, serine, proline, threonine) compared to plant-based protein powders.Moderate
- The geographical origin of protein powder (India, China, Japan) significantly influences its free amino acid profile.Moderate
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