CFR › Title 21 › Part 172 › §172.31521 CFR §172.315Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkNicotinamide-ascorbic acid complex may be safely used in accordance with the following prescribed conditions:(a)The additive is the product of the controlled reaction between ascorbic acid and nicotinamide, melting in the range 141 °C to 145 °C.(b)It is used as a source of ascorbic acid and nicotinamide in multivitamin preparations.