Is L-Cystine vegan?
L-Cystine
L-Cystine is an amino acid derivative used as a flour treatment agent and dietary supplement; it can be produced synthetically or derived from animal sources such as feathers and hair, or from human hair, though plant and fermentation-derived sources also exist.
Why unconfirmed?
L-Cystine can be either derived from animal, or non-animal sources. The ingredient name itself is identical either way, so the label alone can’t tell you which. Only a supplier declaration can.
| E number | E921 |
|---|---|
| INS number | 921 |
| CAS number | 56-89-3 |
| EC number | 200-291-9 |
| Last verified | Needs verification (help us verify this ingredient) |
An ingredient is considered vegan if it contains no animal-derived components at any point in its production.
Selling a product with this ingredient? A supplier declaration can confirm the source. See how certification works.
Classifications are made to the best of our knowledge based on available scientific and regulatory sources. We cannot guarantee the accuracy of every entry, errors in the sources we draw from can always occur. This tool also cannot account for cross-contamination, which depends entirely on individual suppliers and producers. If you believe a classification is incorrect, you can report an issue.
