If there were no ultraviolet rays reaching the earth, human would suffer from deficiency of
Essential amino acids
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Our body is designed to get the vitamin D, it needs by producing it when bare skin is exposed to sunlight. The part of the sun’s rays that is important is ultraviolet B (UVB). This is the most natural way to get vitamin D. Large amounts of vitamin D3 (cholecalciferol) are made in the skin when we expose all of our body to summer sun.