What fat-soluble vitamin should simon be particularly careful with as a supplement because of its greater likelihood of reaching toxic levels in his body?

Because Vitamins A and D (fat-soluble) are stored in the body, Simon should be particularly careful when consuming them in high amounts.  Consuming excess amounts of vitamin D can cause the body to absorb too much calcium and this can lead to excess calcium deposits in critical organs.  Vitamin A toxicity can cause loss of appetite, blurred vision, irritability, headache, and liver damage.  

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