Vitamin intake is beneficial for vegetarians

Those who follow vegan or vegan-like diets which include no animal products can be healthy, but more care must be taken to ensure adequacy.  Vitamin D and iron supplements, in addition to vitamin B-12 at levels sufficient to meet the Recommended Dietary Allowances, may need to be provided.

Well-planned vegetarian diets are adequate for pregnant and lactating women.  With both vegetarian and nonvegetarian diets, iron and folate supplements are usually necessary during pregnancy, although vegetarians frequently have greater intakes of those nutrients than do non-vegetarians.