Is E920 Vegan? L-Cysteine
E920 (L-Cysteine) may or may not be vegan — it depends on the source used by the manufacturer.
Why is E920 check source?
L-Cysteine can be made from either plant or animal sources (human/duck feathers or synthetic). The label will not tell you which was used.
Is E920 vegetarian?
E920 is possibly vegetarian — check the source.
What should vegans do about E920?
Contact the manufacturer directly, or look for a certified vegan logo to be certain.
Reading the label for E920
The exact wording on the pack is the best clue you have when the source isn't stated outright:
| What the label says | What it means |
|---|---|
| Just “E920” or “L-Cysteine”, no qualifier | Uncertain — source unstated. A strict vegan may want to avoid or contact the manufacturer. |
| “Of vegetable origin” or “vegetable l-cysteine” | Vegan-safe — plant-derived, confirmed by the wording itself. |
| Certified vegan logo on the pack | Confirmed — the manufacturer has already verified the source for you. |
| Marked Kosher Pareve | Helpful hint, not proof — pareve means no meat or dairy, which usually points away from an animal source, but isn't a vegan guarantee on its own. |
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Helpful for vegan label reading
Resources for vegans checking E-numbers like E920
Vegan Ingredient Guide
Spot hidden animal-derived E-numbers including E920 on any food label.
Vegan Label Reading
Books and pocket cards that decode E-numbers and hidden animal additives in seconds.
Certified Vegan Foods
Products with vegan certification logos — no ingredient-by-ingredient guessing.
E920 vegan FAQs
Is E920 vegan?
E920 source varies: human/duck feathers or synthetic. Cannot be confirmed vegan without manufacturer verification.
Is E920 always non-vegan?
Not always — E920 can be either plant or animal-derived (human/duck feathers or synthetic). Without certification, you can't tell from the label alone.
How can I tell if E920 is vegan in a specific product?
Look for a certified vegan logo (The Vegan Society, BeVeg, etc.) or contact the manufacturer to ask which source they use for E920.
Other additives to watch for vegans
Data: Open Food Facts (ODbL). Vegan status reflects the most common source — always verify with manufacturer or look for certified vegan labelling.