Vitamins and Minerals Vitamin D is especially recommended for people with a tendency to be deficient (elderly, bedridden, vegans, dark-skinned people, alcoholics, people with kidney, liver or celiac diseases. Vitamin D can produce improvements in mood if of SAD (Seasonal Affective Depression) in less than a week. Vitamin D has an important role by virtue of promoting the process of phagocytosis (where the cells of the immune system engulf and digest bacteria and foreign bodies), thus having anti-tumor activity and modulating effect of the immune system PRESENTATION 90 Pills.