Riboflavin-5′-phosphate (sodium)

E number E101CAS 130-40-5

Riboflavin-5'-phosphate is a more water-soluble form of vitamin B2, used where the plain vitamin will not dissolve well enough — in drinks and liquid preparations, and as a yellow colour.

Where it is and isn’t permitted

Status of Riboflavin-5′-phosphate (sodium) by jurisdiction. Every jurisdiction this site covers is listed, including those where the substance does not appear.
JurisdictionStatusScope and limitsCitation
United StatesFood and Drug AdministrationPermitted21 CFR 184.1697retrieved 2026-09-07
Codex AlimentariusCodex Alimentarius Commission / JECFANot listedDoes not appear on this jurisdiction’s permitted list. That is not the same as being prohibited.

What it is made from

Made by phosphorylating riboflavin, which is itself produced by fermentation or synthesis.

  • Vegan
  • Vegetarian
CAS registry number
130-40-5
InChIKey
OHSHFZJLPYLRIP-BMZHGHOISA-M
PubChem
CID 23666409

Every name it appears under

41 recorded names. A label may use any of them.

E number

  • E101
  • E106

CAS registry number

  • 130-40-5
  • 22251-85-0

As it appears in regulation

  • Riboflavin-5′-phosphate (sodium)

Other names

  • 7,8-Dimethyl-10-ribitylisoalloxazine Phosphate Sodium
  • E 101(ii)
  • FLAVIN MONONUCLEOTIDE MONOSODIUM SALT [MI]
  • Flavin Mononucleotide Sodium Salt
  • FMN-Na
  • Infuvite (TN)
  • Lactoflavin Phosphate Sodium Salt
  • Riboflavin 5'-(dihydrogen phosphate), monosodium salt
  • Riboflavin 5'-(dihydrogen phosphate), sodium salt
  • Riboflavin 5'-(dihydrogen phosphate), sodium salt (1:1)
  • Riboflavin 5'-(sodium hydrogen phosphate)
  • Riboflavin 5'-monophosphate sodium salt
  • Riboflavin 5'-phosphate sodium anhydrous
  • RIBOFLAVIN 5-PHOSPHATE SODIUM
  • Riboflavin monophosphate monosodium salt
  • Riboflavin phosphate (sodium) (Standard)
  • RIBOFLAVIN PHOSPHATE SODIUM
  • Riboflavin Phosphate Sodium Salt
  • Riboflavin Phosphate Sodium Salt (~70%)
  • riboflavin sodium phosphate
  • Riboflavin sodium phosphate (JP18)
  • RIBOFLAVIN SODIUM PHOSPHATE ANHYDROUS
  • Riboflavin sodium phosphate CRS
  • Riboflavin Sodium phosphate(FMN-Na)
  • Riboflavin sodium phosphate; riboflavin 5'-(sodium hydrogen phosphate)
  • Riboflavin-5'-phosphate sodium
  • riboflavin-5'-phosphate sodium salt
  • Riboflavin-5-phosphate sodium
  • Riboflavina 5 fosfato de sodio
  • Riboflavine-5'-phosphate sodium
  • Riboflavine-5?Phosphate Sodium
  • Sodium Riboflavin Phosphate
  • Vitamin B2 Phosphate Sodium Salt

Systematic names

  • Sodium (2R,3S,4S)-5-(7,8-dimethyl-2,4-dioxo-3,4-dihydrobenzo[g]pteridin-10(2H)-yl)-2,3,4-trihydroxypentyl hydrogen phosphate
  • Sodium 1-deoxy-1-(7,8-dimethyl-2,4-dioxo-3,4-dihydrobenzo[g]pteridin-10(2H)-yl)-5-O-(hydroxyphosphinato)-D-ribitol
  • Sodium;[(2R,3S,4S)-5-(7,8-dimethyl-2,4-dioxobenzo[g]pteridin-10-yl)-2,3,4-trihydroxypentyl] hydrogen phosphate

Hazard reference values

Values set by assessing bodies. A body that has not set a value is not listed here.
TypeValuePopulationAssessed byOpinion
ADI0.5 mg/kg bw/dayconsumersEFSA ANS2013

Evidence and how bodies read it

Studies, and the differing conclusions regulators drew from them, are curated by hand rather than machine-read, and none has been written for this substance yet.

Sources for this page

  • ecfr retrieved 2026-09-07

Full licence terms and publisher details on Sources. How this page is built and updated: Method.

Machine-readable:/api/v1/additives/riboflavin-5-phosphate-sodium.json