L-Threonine L－トレオニン（別名L－スレオニン）

In Japan

• An amino acid. No standards for use have been set. The short names are “トレオニン” (threonine) and “スレオニン” (threonine) (the same as for DL-threonine).
• If used to adjust taste, it can be written with the group name “調味料（アミノ酸）” (seasoning (amino acid)).
• It is on the list of “additives that may be used for nutritional fortification” (amino acids), and when used for nutritional fortification, labeling can be omitted (except for foods for special dietary uses and foods with function claims).

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-Threonine 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（簡略名・用途名併記・一括名・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.

Other substances used as nutrient (fortification), seasoning

• DL-Tryptophan
• L-Tryptophan
• DL-Threonine
• DL-Methionine
• L-Methionine