The body needs to have sunlight on the skin, to make vitamin D.
You need vitamin A for healthy eyesight and skin.
it means that your body does not have enough vitamin c, i would recommend if your vitamin c levels are low to go to the store and buy some vitamin c tablets. cause your body needs vitamin c.
vitamin D
It provides the body with vitamin D.
True, provided you are exposed to the sun. Sunlight enables your body to make vitamin D. For this reason, vitamin D is sometimes called the sunshine vitamin.
in large amounts
If your body has an inadequate amount of vitamin C you can develop scurvy. The best way to prevent this is to simply have an orange or other fruit with a high vitamin C content.
kindney
Vitamin A is a fat-soluble vitamin which means that it is stored in the liver. Vitamin A dosages should not exceed the recommended daily amount or they can be toxic to the body.
The amount absorbed and subsequently used by the body
Not all health professionals agree you should take vitamin supplements, at least not as a substitute for getting your vitamins and other nutrients from food. When you get vitamins from food, you get the complete vitamin and co-factors that the nutrients need to work in your body. Supplements do not always, in fact often do not, contain the whole vitamin or the co-factors the vitamin needs to work.
That depends on which vitamins the body is not getting as a result of diet or other enviromental factors.
Vitamin K is converted to active vitamin K in the body which helps to activate clotting factors in the liver. Coumadin (warfarin) prevents the body from activating vitamin K, therefore the clotting factors are never activated and your blood becomes thinner or more difficult to clot. When you eat vitamin K rich foods (green leafy vegitables, etc), the vitamin K competes with the Coumadin and can neutralize its effect.
No vitamin does. Your body needs a balanced amount with protein, sugars and fats. You can not win a race with just taking an extra dose of a vitamin.
The amount of vitamins from your diet, without considering the vitamin supplements
Velocity and mass
Vitamin A is an important element required for the healthy functioning of the body. One of the easiest ways to get the suggested dietary amount is through the use of vitamin A supplements. It is important to pay attention to the amount of vitamin A that is ingested, however, because large doses can actually be very harmful and even cause vitamin A poisoning. Most vitamin A supplements should be taken only after examining the amount of the vitamin in any other supplements being taken. Additionally, some topical skin treatments contain vitamin A as well and can be absorbed into the body quickly. Taking too much vitamin A can result in serious liver damage, although a vitamin A deficiency is equally as harmful over time.