E641 — Leucine · page 3
E641 (Leucine) appears in the ingredient lists of 179 products sold in the United States.
Nutri-Score
86 rated products
Median values
| Calories | 53 kcal |
| Sugars | 0.40 g |
| Saturated fat | 0.00 g |
| Salt | 0.32 g |
Status in the United States (FDA)
Listed in the FDA inventory “Substances Added to Food”, with the regulations 21 CFR 172.320, 172.804.
Technical effects listed by the FDA: flavor enhancer, flavoring agent or adjuvant, nutrient supplement
The inventory is a partial list, and a listing is not an FDA approval of every use; the regulations set the permitted uses.
U.S. Food and Drug Administration, Substances Added to Food (updated 9/8/2026), public domain · CAS 61-90-5 via Wikidata (CC0)
Products
179 products, most viewed first · page 3 of 4.
Source: Open Food Facts export of 23 October 2026, ODbL, and USDA FoodData Central, April 2026 release, CC0 · Shelfpedia calculations (medians, distributions).