Mood matters. A bright mood can make your day. Optimistic can help keep your mood in optimal shape. Healthy production of the mood-regulating neurotransmitter serotonin is supported by the key ingredients l-tryptophan, 5-HTP, coenzyme B-6, folic acid and folinic acid. Optimistic features the clinically studied ingredients vitamin D. 144451SKU 21078027959