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 ...
Improves Vision. Vitamin A can aid in improving vision. It enables your eyes to adjust to light changes, keeps them moist, and also improves night vision. It can prevent many conditions like dry eyes and night blindness by increasing the adaptability of the human eye to both bright light and darkness.