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 of vitamin D that can be made by the body is limited by factors such as sun exposure, skin pigmentation, age, geographic location, clothing coverage, and the use of sunscreen. Additionally, certain medical conditions or medications can affect the body's ability to produce vitamin D.
The amount absorbed and subsequently used by the body
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
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.
The only way to reduce vitamin D in the body is to stop intake of vitamin D.
Vitamin C
They have a low amount of vitamin k
vitamin D