Riboflavin 5'-Phosphate
Also known as: E101a, E101a food additive
Riboflavin-5'-phosphate is the bioactive form of vitamin B2 (an essential nutrient). It is GRAS as a vitamin fortificant and authorized as color E101(ii) in the EU.
What it is
Riboflavin-5'-phosphate (FMN), the phosphorylated active form of vitamin B2, used as a yellow color and as a vitamin fortificant.
Yellow color (E101a), vitamin B2 fortification.
Why it's flagged
- may color urine bright yellow at high intake (harmless)
What regulators actually say
"Riboflavin... may be safely used for the coloring of foods generally... in amounts consistent with good manufacturing practice."
Regulatory status
United States — FDA
GRAS as a nutrient (riboflavin 21 CFR 184.1695); authorized as a color additive exempt from certification (21 CFR 73.450).
European Union — EFSA
Authorized food additive E101(ii) (riboflavin-5'-phosphate) under Regulation (EC) 1333/2008.
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