not really sure myself, i would like to know, i got some l-tyr right now, that i just now took actually, want ot know if i should go for the altyr next time, i have read it makes not much of a difference, actually that l-tyr might be better
rule of thumb: if its a choice between an anafit.com produced/backed product or another companies wares, always go with the former. Has never failed me, nor anyone i know.