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 has many roles in health: normal vision, bone and tooth formation, cell function, and immunity. The carotenoids act as antioxidants. Vitamin A works in the lining of your lungs to help fight infection. It also helps to keep your intestines healthy. Not getting enough vitamin A can lead to night blindness. This means your eyes do not adjust when going from a lighted area to a dark area, such as when entering a dark movie theater.