Metric system. Metric system, international decimal system of weights and measures, based on the metre for length and the kilogram for mass, that was adopted in France in 1795 and is now used officially in almost all countries.
However, if taken in large doses, vitamin D side effects may include: Thirst; Metallic taste in the mouth; Increased urination; Decreased appetite; Weight loss; Constipation; Vomiting; Diarrhea; Itchy skin; Loss of muscle tone; Irritability; Tiredness; Sore eyes; Pain in the bones and joints ...
Vitamin A. Vitamin A has many important functions in your body. It helps regulate your immune system, helps form and maintain healthy teeth, skin, and tissue, it produces the pigments in the retina of the eye, and promotes good vision. A deficiency in this vitamin can lead to problems with any of these.