What is E101a?
E101a is Riboflavin-5'-phosphate, a colour. No animal source in normal food production.
Also written as: INS 101a, E-101a, E 101a. INS is the international numbering system used outside Europe, including on labels in Asia, Australia and the Middle East.
What to do
No action needed for this additive. Check the rest of the ingredient list, and remember that meat products still need proper halal slaughter.
Frequently asked questions
Is E101a halal?
E101a (Riboflavin-5'-phosphate) is halal. No animal source in normal food production.
What is E101a made from?
Made from riboflavin.
What is E101a used for?
E101a is used as a colour, typically in sweets, soft drinks, desserts, sauces and snacks.
What should I do if a product contains E101a?
No action needed for this additive. Check the rest of the ingredient list, and remember that meat products still need proper halal slaughter.
Related E-numbers
Last reviewed 2026-10-06. How we decide · Suggest a correction