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E101aColorantLow concern
Riboflavin-5'-Phosphate
In plain words
The short version
The phosphate ester of vitamin B2 — a more water-soluble form for fortification and yellow coloring.
Why it's green
It's widely considered safe at the amounts used in food, so we mark it green. The Safety section below has the details.
Safety profile
ADI not specified — considered safe. Hydrolyzed in digestion to riboflavin and phosphate, both essential nutrients. Excess water-soluble vitamins are excreted in urine (sometimes producing the bright-yellow urine color associated with B-complex supplements).
The detail
Educational information only. Not medical or dietary advice.