Comparison

Zen Theanine and L-Theanine

Zen Theanine (AOR Advanced Orthomolecular Research Premium) lists 1 distinct ingredients and L-Theanine (PureBulk.com) 1 (rows of one ingredient counted once); 1 are on both labels. On the site's similarity measure, which compares ingredient lists (1 for the same list, rarer ingredients counting for more; amounts are not part of it), the two formulas score 1.00: the same ingredients, at the amounts in the table below.

Amount per serving (and % of the Daily Value)
Ingredient	Zen Theanine	L-Theanine
Theanine	225 mg	250 mg

Amounts are per serving as DSLD gives them: Zen Theanine, 1 capsule; L-Theanine, 250 mg. Current labels entered March 2020 and June 2013. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.

Each product on its own

Zen TheanineAOR Advanced Orthomolecular Research Premium: every row against all products listing it
L-TheaninePureBulk.com: every row against all products listing it