Thiamin Mononitrate
Also known as: thiamine mononitrate
FDA-permitted nutrient added to enriched grain products at mandated levels. Thiamin is an essential B vitamin; deficiency causes beriberi.
What it is
Synthetic, stable form of vitamin B1 (thiamine). The nitrate salt is preferred for fortification because it tolerates heat and humidity better than thiamin hydrochloride.
Vitamin fortificant; required addition to enriched cereal grain products under FDA standards of identity.
Why it's flagged
- No established adverse effects from food-level intake; thiamin is water-soluble and excess is excreted
What regulators actually say
"Enriched flour ... contains in each pound 2.9 milligrams of thiamin, 1.8 milligrams of riboflavin, 24 milligrams of niacin, 0.7 milligrams of folic acid, and 20 milligrams of iron."
"Thiamin (also called vitamin B1) helps turn the food you eat into the energy you need. ... The Food and Nutrition Board did not establish ULs for thiamin because no studies have shown adverse effects from consuming too much thiamin."
Regulatory status
United States — FDA
Permitted food additive in enriched grains (21 CFR 137.165)
European Union — EFSA
permitted as nutrient addition
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