L-Cysteine Side Effects

Cysteine with E number E920, is an nonessential α-amino acid Cysteine, marketed in nutritional supplements as an antioxidant and immune system booster. As a nutritional supplement, L cysteine can be found in a variety of forms, the most common being N-acetyl-L-Cysteine and D-cysteine.

 

General Side Effects

No significant side effects reported for this amino acid. L-Cysteine can cause nausea, vomiting, and diarrhea or constipation in specific groups of individuals.

Suggested Dosage

As L-Cysteine is widely known as safe, there is no limit on dosage of intake. However, we still recommend consumers to consult professionals before using large quantity of L-Cysteine for long period.
* ADI: Acceptable Daily Intake
* MTDI: maximum tolerable daily intake
* Data source: JECFA Database of WHO

Special Groups Precaution

Special groups refer to newborns, children, pregnant and any other applicable vulnerable groups.
There is no evidence that L-Cysteine could have any negative effects on these vulnerable groups. It should be safe to use L-Cysteine in food for newborns and pregnant. However, we still recommend consumers to consult professionals before using large quantity of L-Cysteine for long period in food for newborns or pregnant.

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