Food additive databaseseasoning, nutrient (fortification)Checked 2026-10-02
L-Isoleucine L－イソロイシン
Designated additiveNot on the EU additive list
- Purpose
- seasoning, nutrient (fortification)
- On the label
- “調味料（アミノ酸）” (seasoning (amino acid)), “調味料（アミノ酸等）” (seasoning (amino acids, etc.)), “L-イソロイシン” (L-isoleucine), “イソロイシン” (isoleucine)
- Name in the List of Designated Additives
- L－イソロイシン (No. 63)
In Japan
- An amino acid used as a seasoning and a fortifier. There are no standards for use.
- When used as a seasoning, it can be written with the group name “調味料（アミノ酸）” (seasoning (amino acid)). The short name is “イソロイシン” (isoleucine). When used for nutritional fortification, labeling is generally exempt (Food Labeling Standards).
Japan's standards for use
There are no standards for use that limit which foods or how much (the general standards for all additives still apply).
This is a summary of the standards for use. See the source list for the exact conditions.
In the EU
- It is not on the EU list of food additives (Regulation (EC) No 1333/2008, Annex II), so it cannot be used as a food additive in the EU.
When it is labeled under a shared name
L-Isoleucine may be declared on the label in the same way as “調味料（アミノ酸等）”. See Seasoning (amino acids etc.) — e.g. MSG for details.
Sources
- List of Designated Additives — Japan Food Chemical Research Foundation (Japanese)
- Standards for use and storage of each additive — Japan Food Chemical Research Foundation (Japanese)
- EU food additive database (Japanese translation) — MAFF (Japanese)
- Regulation (EC) No 1333/2008 on food additives — EUR-Lex
- 消費者庁「食品表示基準について」別添 添加物関係（1-1 簡略名・類別名、1-4 一括名の範囲、1-5 栄養強化の範囲） (Japanese)
Checked 2026-10-02. Rules and evaluations change over time. This page is a translation of our Japanese page; if they differ, the Japanese page is the reference.
This page lists facts stated in laws and in evaluations by public bodies; it is not a safety verdict. Additives used in Japan are approved by the government, which sets the foods and amounts they can be used in. The ADI is a guide to the amount that is considered safe to take every day over a lifetime.
Other substances used as seasoning, nutrient (fortification)
- Monosodium L-Aspartate
- DL-Alanine
- L-Arginine L-Glutamate
- L-Glutamic Acid
- L-Theanine
- L-Valine
- L-Histidine Monohydrochloride
- L-Phenylalanine
- L-Lysine L-Aspartate
- L-Lysine Monohydrochloride
- L-Lysine L-Glutamate
- L-Asparagine
- L-Alanine
- L-Arginine
- L-Glutamine
- L-Cystine
- L-Serine
- L-Tyrosine
- L-Histidine
- L-Hydroxyproline
- L-Proline
- L-Lysine
- L-Leucine