Ans: An alternative source of vitamin B12 for meat is algae. Every 100g of sun dried  Chlorella Vulgaris contains 10-50 micrograms of vitamin B12. Vitamin B12 present in chlorella is a natural source. It is an excellent natural supplementation for vegetarians to avail enough sources of vitamins as in meat. Also, the nutrient called tryptophan present in chlorella will act as a sleep enhancing amino acid. This is used by the brain to produce neurotransmitters, melatonin, and serotonin, which help to relax the brain for sufficient sleep. Usually, young people will have high melatonin levels. This is the reason for young people to have better sleep.