Is E101 Vegan?
E101 (Riboflavin) may or may not be vegan — it depends on the source. It is produced by fermentation, though it can historically be sourced from milk or eggs, and the ingredients label never tells you which source was used.
Why is E101 uncertain?
Produced by fermentation, though it can historically be sourced from milk or eggs. Manufacturers can legally use either source and simply list 'E101' or 'Riboflavin' on the label. In practice most modern production is plant-based or synthetic, but without confirmation from the manufacturer or a vegan certification logo, you can't be sure.
What can vegans look for instead?
The safest options are: (1) choose products carrying a certified vegan logo, which guarantees a plant or synthetic source was used; (2) contact the manufacturer and ask directly about the source of E101; or (3) choose products that don't list E101 at all.
Is E101 vegetarian?
Possibly not — like its vegan status, the vegetarian status of E101 depends on whether an animal or plant source was used, which the label doesn't reveal.
Frequently Asked Questions
Is E101 always non-vegan?
No — E101 is often plant-derived or synthetic, and in many products it is vegan. The problem is that the label doesn't distinguish, so each product needs verifying.
How can I tell if E101 is vegan in a specific product?
Check for a certified vegan logo on the packaging — that's the only label-level guarantee. Otherwise contact the manufacturer's customer service and ask specifically about the source of E101 in that product.
Are there vegan-friendly versions of E101?
Yes — plant-based and synthetic versions of E101 are common, and products with vegan certification will always use them. The label alone just can't tell you which version a given product contains.
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Vegan status follows the Open Food Facts additive taxonomy (ODbL licence). Sources may vary by manufacturer — check packaging or look for certified vegan labelling.