Comparison
Amino Day and Amino 21
Amino Day (Source Naturals) lists 22 distinct ingredients and Amino 21 (DaVinci Laboratories) 21 (rows of one ingredient counted once); 20 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 0.92.
| Ingredient | Amino Day | Amino 21 |
|---|---|---|
| Taurine | not disclosed | 75 mg |
| Leucine | not disclosed | 0.0225 g |
| Glutamine | not disclosed | 0.075 g |
| Valine | not disclosed | 0.015 g |
| Isoleucine | not disclosed | 0.0075 g |
| Tyrosine | not disclosed | 30 mg |
| Arginine | not disclosed | 22.5 mg |
| Lysine | not disclosed | 30 mg |
| Glycine | not disclosed | 45 mg |
| METHIONINE | not disclosed | 22.5 mg |
| Phenylalanine | not disclosed | 30 mg |
| Histidine | not disclosed | 7.5 mg |
| THREONINE | not disclosed | 15 mg |
| Glutamic Acid | not disclosed | 225 mg |
| Alanine | not disclosed | 15 mg |
| Cysteine | not disclosed | 22.5 mg |
| Aspartic Acid | not disclosed | 45 mg |
| Proline | not disclosed | 7.5 mg |
| Serine | not disclosed | 15 mg |
| Ornithine | not disclosed | 7.5 mg |
| Vitamin C | 45 mg (50%) | |
| Vitamin B6 | 15 mg (882%) | |
| Citrulline | 0.015 g |
Amounts are per serving as DSLD gives them: Amino Day, 3 tablets; Amino 21, 1 capsule. Current labels entered October 2022 and December 2024. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.