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.
Coenzyme Q-10 is a substance in the human body that is vitamin like. Naturally, it is found in meats and seafood but can also be man made.
Vitamin D
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.
Human skin produces Vitamin D in presence of sun light but not the other parts of body.
vitamine A witch will be transformed to vitamine D by the human body
vitamin D
Vitamin B12 is the only water-soluble vitamin that can be stored in the human body in large amounts, primarily in the liver. This allows for a reserve to be maintained for months to years, unlike other water-soluble vitamins that need to be consumed more regularly.
Calcitriol