Vitamin D 4000IU - 180 Tablets High Strength Vitamin D3 Supplements Immune Bones

Vitamin D3 4000iu ( 100μg). Vitamin D3 is produced when sunlight converts a pro-hormone in the skin into vitamin D. A form of cholesterol naturally found in the skin absorbs the UVB radiation and converts it into cholecalciferol, the pre-vitamin form of D3.

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