Last reviewed May 2026 · 1 min read
Is Riboflavin vegan?
Also known as: Vitamin B2, E101, Lactoflavin (obsolete)
E-number: E101
Vegan
Suitable for a vegan diet.
Yes — While it can be found in milk and meat, commercial E101 is produced through the fermentation of fungi or genetically modified bacteria.
01 · The basics
What is Riboflavin?
Vitamin B2, used both as a nutritional supplement and as a yellow food coloring.
02 · The source
Where it comes from
While it can be found in milk and meat, commercial E101 is produced through the fermentation of fungi or genetically modified bacteria. It is vegan.
03 · Alternatives
Best vegan alternatives
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Frequently asked
FAQ
Is E101 vegan?
Yes. Despite the old name 'lactoflavin', the modern commercial production of riboflavin uses microbial fermentation, not dairy.
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