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 ...
Researchers have found that certain nutrients, such as lutein/zeaxanthin, vitamin C, vitamin E, and zinc, can reduce the risk of certain eye diseases, including macular degeneration and cataracts. For more information on the importance of good nutrition and eye health, please see the diet and nutrition section.