Comparison

DL-Phenylalanine and L-Phenylalanine 500 mg

DL-Phenylalanine (DC) lists 1 distinct ingredients and L-Phenylalanine 500 mg (BIOVEA) 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	DL-Phenylalanine	L-Phenylalanine 500 mg
Phenylalanine	1,000 mg	1,000 mg

Amounts are per serving as DSLD gives them: DL-Phenylalanine, 2 tablets; L-Phenylalanine 500 mg, 2 vegetarian capsules. Current labels entered April 2022 and October 2019. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.

Each product on its own

DL-PhenylalanineDC: every row against all products listing it
L-Phenylalanine 500 mgBIOVEA: every row against all products listing it