Calcitriol
Alpha-tocopherol is the form of tocopherol that exhibits vitamin E activity in the human body. It is the most biologically active form of vitamin E and is the form typically found in supplements and fortified foods.
vitamin D
Vitamins are broken down into their active forms in the body, such as retinol for vitamin A or ascorbic acid for vitamin C. These active forms can then be utilized by the body for various physiological functions.
three
Vitamin D
No, vitamins are by definition an essential nutrient that cannot be made by the body in sufficient quantities. Vitamin D is not really a vitamin. The human body can produce this nutrient and it is actually a hormone, not a vitamin.
Vitamin k is essential for blood clotting thus helping wounds to heal.
veins , capillaries, arteries
It strengthens blood capillaries.
No, Cobalamin (B12) is a vitamin necessary to the human body.
You probably die because vitamin k is important to have in human body.
precursors