cysteine glutathione detection Simultaneous of and in food with a two-channel near-infrared fluorescent probe Determination of cysteine and glutathione
Description
BMC Complement Med Ther 22:241
Because the active (non-protonated) Meta II conformation absorbs at 378 nm, it appears that most of the chromophore in the triple mutant is bound via a non-protonated Schiff-based linkage

Visible improvement usually appears within 48 weeks of consistent use

M25.512 is exactly right
