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 ...
As an antioxidant, vitamin C helps to prevent cataracts -- the clouding of the lens of the eye that can lead to blindness in older adults. The lens needs a lot of vitamin C to counteract all the free radicals that form as a result of sunlight on the eye. Vitamin C is concentrated in the lens.