Vit D
 

The deficiency of vitamin D is manifested trough a few symptoms, such as muscle weakness, depression, weak immune system and some skin conditions. In order for the skeletal muscle to function properly you need vitamin D. Unfortunately it’s very hard to get the quantities of this vitamin only from the food you eat and sun exposure. Thais is why it’s important to supplement your diet with around 1000 UI of vitamin D a day.