S.C. Code § 39-27-30
All white bread sold or offered for sale within the State shall be enriched to contain in each pound, as sold, not less than one milligram and not more than two milligrams of vitamin B-1 (thiamine), not less than four milligrams and not more than sixteen milligrams of nicotinic acid (niacin) or nicotinic acid amide (niacin amide) and not less than four milligrams and not more than sixteen milligrams of iron (Fe).
The enrichment of white bread may be accomplished through the use of enriched flour, enriched yeast, other enriched ingredients, synthetic vitamins or harmless iron salts or by any combination of methods which will produce enriched bread which meets the standards herein defined.
The State Department of Agriculture shall change or add to the specifications for ingredients and the amounts thereof as necessary to conform to the Federal definition of enriched bread when promulgated.
S.C. Code § 39-27-30