Question: what vitamins and minerals are lacking in a vegan diet?
Answer: Vitamin B12. Vitamin B12 is an essential nutrient that's almost exclusively found in animal-sourced foods, such as fish, meat, dairy products, and eggs ( 1 ). ... 
Creatine. ... 
Carnosine. ... 
Vitamin D3 (Cholecalciferol) ... 
Docosahexaenoic acid (DHA) ... 
Heme iron. ... 
Taurine.