L-Theanine (generic/unbranded)
L-Theanine (generic/unbranded) is a tier 2 form of L-Theanine, used in 1,997 on-market products .
1,997
on-market products
tier 2
quality tier
n/a
elemental fraction
Why this tier: Chemically identical to branded forms when purity is verified; an industry-sourced report claimed some synthetic/generic products contained D-theanine (less well absorbed than L-theanine in rats), but independent confirmation is lacking -- quality may be manufacturer-dependent rather than guaranteed by the name alone.
Source: Desai MJ, Armstrong DW. 2005, Chirality 17:154-162, PMID 15704209 (rat PK of theanine enantiomers); the industry claim of racemic generic product is unconfirmed