What happens if you take in too much Vitamin A. you could develop vitamin A toxicity, known as Hypervitaminosis A. Excessive intake of Vitamin A in the form of beta carotene is not harmful, but will cause the skin to turn yellow. This can be reversed by consuming less beta carotene.
In contrast large doses of supplements of Vitamin A as retinol (10 to 15 times the RDA) is harmful and could result in fatty liver (hepatomegally), dry skin, nausea, vomiting, fatigue, weakness, headaches, anorexia and possibly an increase in birth defects among pregnant women.
This is reasonably common with as many as 5 per cent of people taking vitamin A suffering from the toxicity symptoms. Stopping the large doses usually reverses the symptoms with no lasting damage, although in children damage can be permanent.
Too much carrot juice and vitamin A supplements can kill you!
Though the yellowing of the skin from indulging in a heavy dose of carrots is seldom serious and will disappear in a few days, continued carrot gorging can cause medical problems. In 1974 one unfortunate English health advocate named Basil Brown consumed 10 gallons of carrot juice and took 10,000 times the recommended RDA of vitamin A in a period of 10 days. Those 10 days were the unfortunate man's undoing, his skin turned bright yellow and he died of severe liver damage.
Extract from "The Times" - Times 15 February 1974
Carrot juice diet killed scientist
A health food addict who had been drinking up to eight pints of carrot juice a day was bright yellow when he died, an inquest at Croydon. Surrey, was told yesterday. Dr John Fabricius said he believed Mr Basil Brown' aged 48, a scientific adviser, had died of vitamin A poisoning.
Mrs Brenda Brown, of Hayes Lane, Kenley, the dead man's wife, told Dr Mary McHugh, the coroner, that she had prepared the carrot juice. "Nobody pre- scribed it. He just thought it was the right way to cat. He also took vitamin A tablets."
A typical day's diet for her husband was: breakfast, carrot juice and fruit ; midday, more carrot Juice and fruit; evening meal, eggs, tomatoes, cheese. Dr J. Fabricius, the family's doctor, told the coroner that he had warned Mr Brown against his addiction to vitamin A. He had warned Mr Brown to stop taking vitamin A and had later sent him to a specialist who also warned him.
Mr Brown had been '"an intelligent man but he had a very low opinion of doctors ". Dr David Haler, a pathologist, said that Mr Brown was bright yellow when he died. Vitamin A poisoning, like alcoholic poisoning, produced cirrhosis of the liver. The inquest found that Mr Brown had died from carrot juice addiction.