Question: what is the best vitamin supplement for vegetarians?
Answer: Vitamin B12. Foods often touted to be rich in vitamin B12 include unwashed organic produce, mushrooms grown in B12-rich soils, nori, spirulina, chlorella, and nutritional yeast. ... 
Vitamin D. ... 
Long-chain omega-3s. ... 
Iodine. ... 
Iron. ... 
Calcium. ... 
Zinc.