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 ...
1 Vitamins A, C, E, and minerals like copper and zinc are essential to eyesight.  Antioxidants, including beta-carotene, lutein, and zeaxanthin, protect the macula from sun damage. Get these antioxidants from dark leafy greens, egg yolks, yellow peppers, pumpkin, sweet potatoes, and carrots.