no they are perfectly fine
Ascorbic acid, also known as vitamin C, is not particularly dangerous. Not having enough of it is dangerous.
All vitamins are dangerous if taken at too high levels.
Yes, too much of anything can be dangerous for you/your health.
Vitamin K is given to new born babies to prevent them from having catastrophic bleeding - which would likely to cause their death. There is very little danger of a vitamin being dangerous as long as it is administered correctly.
Large doses of vitamin C or D are both dangerous. Please check with your doctor before taking any supplements.
It is likely not dangerous for a 17 year old to a take a small amount of vitamin E. If there are health issues, it is always a good idea to consult a doctor.
There are many dangerous side effects of a Vitamin B deficiency, including permanent nerve damage and destruction of parietal cells. A Vitamin B deficiency can also cause chronic gastrointestinal discomfort.
It is said that about 3000 mg a day is the limit for vitamin C. Anything about that amount probably will not be hugely dangerous but may cause some unwanted symptoms
Excess of vitamin intake or vitamin overdose is called hypervitaminosis. It is a condition of high storage levels of vitamin, which can lead to toxicity.Hypervitaminosis A is an excess of vitamin A, Similarly Hypervitaminosis C an excess of vitamin C, and so on.High or toxic levels of vitamins occur when you have high supplement intake and when you do not take from dietary sources.
It depends on which medication. One should avoid consuming excess vitamin E when taking the medication that is used for thinning blood. Too much consumption of Vitamin E is dangerous and you should consult a doctor before taking Vitamin E supplements.
this should be discussed with a doctor; Vitamin E affects the blood clotting mechanisms and can be dangerous if too much is taken...e.g., for anyone having surgery.