Suntheanine (branded, fermentation-derived)

Suntheanine (branded, fermentation-derived) is a tier 1 form of L-Theanine, used in 0 on-market products .

Why this tier: The specific branded ingredient used in the large majority of published human L-theanine RCTs, giving it the deepest clinical evidence trail of any single commercial form; independent analyses report >99% L-isomer purity. Superiority to a verified-pure generic is not independently confirmed by a head-to-head PK/outcomes trial -- this tier reflects depth of clinical usage, not proven PK superiority.

Source: widely used as the study article across L-theanine RCTs; purity claim is manufacturer-sourced

Brands using this form

No on-market brand data available.