Vitamin A, also known as retinol, plays a critical role in maintaining epithelial tissues that line several surfaces and structures, such as skin, gastrointestinal tract, respiratory tract, and nose. Vitamin A also plays a role in visual function, and immune functions.
Vitamin D3 (cholecalciferol) plays an integral role in calcium metabolism and bone health as well as healthy immune defense.
Vitamin K2 supports the deposition of calcium into bone, it also has a regulatory effect on Vitamin A and D by activating the proteins in both vitamins and with regard to osteoclast and osteoblast activity.
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