Comparison

Serotonin FX and L-Tryptophan 1000 mg

Serotonin FX (The People's Chemist) lists 2 distinct ingredients and L-Tryptophan 1000 mg (NOW) 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 0.52.

Amount per serving (and % of the Daily Value)
IngredientSerotonin FXL-Tryptophan 1000 mg
Tryptophannot disclosed1,000 mg
Valeriannot disclosed

Amounts are per serving as DSLD gives them: Serotonin FX, 1 capsule; L-Tryptophan 1000 mg, 1 tablet. Current labels entered September 2019 and October 2012. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.

Each product on its own