The addition of folic acid to food. In Canada, folic acid must be added to enriched pasta, white flour, infant formula, whole egg substitutes, and simulated meat products.
References:
Canadian Food Inspection Agency. Foods to Which Vitamins, Mineral Nutrients and Amino Acids May or Must Be Added [D.03.002, Fdr] [Internet]. 2018 [cited 2018 Nov 12]. Available from: http://www.inspection.gc.ca/food/labelling/food-labelling-for-industry/nutrient-content/reference-information/eng/1389908857542/1389908896254?chap=1