L-Cystein Monohydrochloride L－システイン塩酸塩

In Japan

• The hydrochloride of an amino acid (cysteine). Under the standards for use, it may be used in natural fruit juice and bread, and when used for seasoning there is no restriction on the food.
• Under the Food Labeling Standards, when used as a seasoning it can be labeled with the group name “調味料（アミノ酸）” (seasoning (amino acid)). When used for nutritional fortification, it falls within the range for which additive labeling may be omitted (Annex, Additives 1-5).
• When written by substance name, the short names “システイン塩酸塩” (cysteine hydrochloride) and “システイン” (cysteine) can be used.

Japan's standards for use

• May be used in natural fruit juice and bread
• When used for seasoning purposes, it is not limited to bread and natural fruit juice

This is a summary of the standards for use. See the source list for the exact conditions.

In the EU

• It is on the EU list of food additives (Regulation (EC) No 1333/2008, Annex II) as E920.
• In the EU, as E920 (L-cysteine, including its hydrochloride), it is permitted as a flour treatment agent in wheat flour (food category 06.2.1).

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・類別名一覧、用途名併記の例示、一括名の範囲、栄養強化の範囲ほか） (Japanese)
• 消費者庁「食品表示基準について」本体（添加物の表示） (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 antioxidant, processing agent

• Horseradish Extract
• Tea Extract
• Grape Seed Extract