E641 — Leucine
E641 (Leucine) appears in the ingredient lists of 41 products sold in the United Kingdom.
Nutri-Score
22 rated products
Median values
| Energy | 16 kcal |
| Sugars | 0.45 g |
| Saturates | 0.00 g |
| Salt | 0.01 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 containing it, by country
Products listing this additive in each country edition of Shelfpedia (Open Food Facts data)
| Country | Products |
|---|---|
| France | 220 |
| United States | 179 |
| Germany | 41 |
| United Kingdom | 41 |
| Spain | 39 |
| Australia | 27 |
| Canada | 24 |
| Italy | 23 |
| Sweden | 18 |
| Belgium | 16 |
| Netherlands | 12 |
| Switzerland | 11 |
| Brazil | 10 |
| Ireland | 8 |
| New Zealand | 8 |
| Morocco | 8 |
| Japan | 7 |
| Czechia | 6 |
| Romania | 6 |
| Finland | 5 |
Products
41 products, most viewed first.
Source: Open Food Facts export of 23 October 2026, ODbL · Shelfpedia calculations (medians, distributions).