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 is essential to the proper functioning of the retina. It also helps prevent night blindness by helping the eye to adapt to changes in lighting. Vitamin A also helps reduce the risk of age-related macular degeneration (AMD) and it inhibits the formation of cataracts. AMD and cataracts are the leading causes of visual impairment, so getting enough Vitamin A is essential to the health of your eyes.