Is E101 (Riboflavin (Vitamin B2)) Halal?
Doubtful — depends on source
E101 (Riboflavin / Vitamin B2) is a yellow colour and vitamin that can be made synthetically, by microbial fermentation, or on animal-derived growth media — so it is treated as doubtful (mushbooh) unless the source is known.
What is E101?
Riboflavin is vitamin B2, also used as a yellow-orange food colour. It can be produced synthetically or by microbial fermentation; the fermentation medium can in some cases be animal-derived.
Made by chemical synthesis or by fermentation using microorganisms grown on a nutrient medium. The medium is usually plant-based, but can vary and is rarely stated.
Why is it doubtful (mushbooh)?
Riboflavin itself is not a prohibited substance; the doubt is about production. Synthetic and plant-fermentation riboflavin is halal; where the growth medium may be animal-derived, the source should be confirmed. Because this is seldom stated, it is treated as doubtful until verified.
Commonly found in
It may be found in — this does not mean every product below contains it.
- Cereals and dairy products
- Sauces and desserts
- Supplements and fortified foods
- Some soft drinks
How it appears on labels
RiboflavinVitamin B2E101Colour (E101)INS number: 101
How to verify a product in Singapore
- Ingredient-level guidance is not halal certification — check the complete product, not just this ingredient.
- Look for recognised halal certification, and check the finished product on the official MUIS HalalSG register.
- When the source or processing aids are unclear, contact the manufacturer.
In Singapore, verify the finished product on the MUIS HalalSG register or contact the manufacturer if the production source is unclear.
Check MUIS HalalSGSources: EFSA, FAO/WHO, MUIS · Last reviewed: July 2026 · This guidance is not certification.
Frequently asked questions
Is E101 (riboflavin) halal?
It is usually halal (synthetic or plant-fermentation), but because the fermentation medium can vary and is rarely stated, it is treated as doubtful until confirmed.
Is Vitamin B2 from animals?
It can be produced synthetically or by fermentation; most is not animal-derived, but the medium is not always stated. Confirm if you need certainty.
What names should I look for?
'Riboflavin', 'Vitamin B2' or 'E101'.
Related ingredients
Sources & methodology
- Re-evaluation of riboflavin (E 101) as a food additive — European Food Safety Authority (EFSA) · Synthetic/fermentation production
- General Standard for Food Additives (GSFA) Online Database — Codex Alimentarius (FAO/WHO) · Approved uses and INS number
- Halal Certification — HalalSG — Majlis Ugama Islam Singapura (MUIS) · Singapore halal verification process
Humble Halal methodology: we classify additives by their common origin, not by any specific product. A generally-halal ingredient does not make a finished product halal-certified. This page is general guidance, not certification or religious/legal advice — always verify the complete product. Last reviewed July 2026.