What do vegans have difficulty obtaining?

vitamin B-12 Most soy products have added vitamin B12. Vegans may have difficulty obtaining iron as they don't eat blood--this can be remedied by eating spinach, oatmeal, beans, raisins and food cooked in cast iron. Include vitamin C in your diet as that helps you absorb iron. Protein can be problematic as vegans eat far less protein than those who eat animal products. A vegan can get adequate protein from nuts and seeds, whole grains, bean/bean products and a variety of vegetables (almost all have some protein). Calcium can be problematic but vegans can get calcium from tofu, green leafy vegetables like collards, sesame seeds.