Vitamine A
The effects of excessive vitamin A intake include:
birth defects
liver abnormalities,
reduced bone mineral density that may result in osteoporosis
coarse bone growths
hair loss
excessive skin dryness/peeling
Signs of acute toxicity include nausea and vomiting, headache, dizziness, blurred vision, and loss of muscular coordination.
vitamine B1
The only known cases of thiamine overdose occurred with thiamine injections. Thiamine injection may result in anaphylactic reactions
Vitamine B3
Extremely high doses of niacin can cause niacin maculopathy, a thickening of the macula and retina which leads to blurred vision and blindness.[3] The recommended daily allowance of niacin is 2-12 mg a day for children, 14 mg a day for women, 16 mg a day for men, and 18 mg a day for pregnant or breast-feeding women.[4] Over 20 mg per day may produce hot flushes lasting 15-30 minutes in duration, along with a strange itching sensation and a reddening of the skin. In some cases it may cause a headache or even nausea. This is completely normal if a large dose of niacin hasn't been taken before and is caused by the cells of the body releasing histamine, which results in vasodilation. Once the body becomes used to the larger dose (usually over a period of days), these side effects will lessen or cease. Taking aspirin half an hour before the niacin will generally lessen the side effects.
vitamine B6
An overdose of pyridoxine can cause a temporary deadening of certain nerves such as the proprioceptory nerves; causing a feeling of disembodiment common with the loss of proprioception. This condition is reversible when supplementation is stopped.[2]
Because adverse effects have only been documented from vitamin B6 supplements and never from food sources, only the supplemental form of vitamin B6 (pyridoxine) is discussed with respect to safety. Although vitamin B6 is a water-soluble vitamin and is excreted in the urine, very high doses of pyridoxine over long periods of time may result in painful neurological symptoms known as sensory neuropathy. Symptoms include pain and numbness of the extremities, and in severe cases difficulty walking. Sensory neuropathy typically develops at doses of pyridoxine in excess of 1,000 mg per day. However, there have been a few case reports of individuals who developed sensory neuropathies at doses of less than 500 mg daily over a period of months. None of the studies, in which an objective neurological examination was performed, found evidence of sensory nerve damage at intakes of pyridoxine below 200 mg/day
vitamine B9
The risk of toxicity from folic acid is low
vitamine C
Chance of overdose
As discussed previously, vitamin C exhibits remarkably low toxicity. The LD50 (the dose that will kill 50% of a population) is generally accepted to be 11900 milligrams per kilogram.[32] This means that for a 60 kilo (132 pound) human, one would need to administer 714,000 mg (714 g or 1.6 pounds) of vitamin C in order to to stand a 50% chance of killing the person. However, vitamin C cannot result in death when taken orally as large amounts of the vitamin cause diarrhea and are not absorbed.[33] An extremely large amount of vitamin C would need to be rapidly injected in order to stand any chance of killing a person. Supposedly, Robert Cathcart has used intravenous doses of up to 250 grams with no adverse effects.
vitamine D
Symptoms of vitamin D poisoning include:
Dehydration
Vomiting
Decreased appetite (anorexia)
Irritability
Constipation
Fatigue
An excess of vitamin D causes abnormally high blood concentrations of calcium (hypercalcemia) which can eventually cause severe damage to the bones, soft tissues, and kidneys. It can also damage the kidney and produce kidney stones
das alles wat ik vond
met dank aan verschillende wikipedia pagina's
Een tekort is veel erger dan een overdosis, en als je de dosis bekijkt die nodig is voor een overdosis, zou ik gewoon zeggen: "niet klagen en pak die pilletjes, ge hebt geluk dat ge een moeder hebt da zo bezorgd is"