L-Tyrosine (free-form amino acid)
L-Tyrosine (free-form amino acid) is a tier 1 form of L-Tyrosine, used in 2,592 on-market products .
2,592
on-market products
tier 1
quality tier
n/a
elemental fraction
Why this tier: The form used in the oral human trials cited on the compound (McAllister 2024, Coull 2016, Steenbergen 2015); in Coull 2016 a single 150 mg/kg dose raised serum tyrosine as much as a double dose. "Micronized", "fermented" and "HPLC" describe particle size, origin or assay, not a distinct chemical form.
Source: Coull N et al. 2016, Med Sci Sports Exerc 48(2):277-286, PMID 26285023; McAllister MJ et al. 2024, Stress 27(1):2375588, PMID 38975711