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 An eye disease called age-related macular degeneration (AMD). 2  Some research shows that taking vitamin B12 with other vitamins, including folic acid and vitamin B6, might help prevent an eye disease called age-related macular degeneration. Injecting vitamin B12 as a shot, as well as taking through the nose or by mouth, is effective for treating low red blood cell counts caused by poor absorption of vitamin B12. 2  Vitamin B12 deficiency. 3  Taking vitamin B12 by mouth, through the nose, or as a shot is effective for treating vitamin B12 deficiency.