The purity of a vitamin is the same as the purity of any other substance; it means that you have only that substance and nothing else mixed in with it.
In humans, vitamin c.
It is a compound, so it is a pure substance.
No calcium is in pure vitamin C. It is possible a manufacture may prepare the calcium salt of vitamin C in its formulation. The label would indicate that.
Vitamin D, Vitamin B, Vitamin E Good for me, makes you pee Anything with the "ee" sound really.
Not exactly. The body will convert Beta Carotene into Vitamin A when it is needed. That's why Beta Carotene is the preferred and safer version of Vitamin A... you can overdose on pure Vitamin A easier than you can on Beta Carotene
It is a compound, so it is a pure substance.
Yes because it is 1 compound: C4H5N3O. It does have to mix with other compounds to be created.
B
skin
No, collagen is a type of protein and retinol is a pure form of Vitamin A.
Vitamin E is an anti-oxidant which is very soothing if applied to a burn. (But can be sticky and difficult to apply to the skin in its pure form)
Pure evil