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A member asked:
What are some things that can cause low vitamin a and d levels?
A doctor has provided 1 answer
Bad diet, indoors: It is rare to have low vitamin a in the usa as even limited diets contain enough of this vitamin to meet the body's needs. Vitamin d however is dependent partially on diet and also on sunlight so low vitamin d is common and it is reasonable to supplement this with 2000-4000 units of d3 per day especially in poorly lit climates like seattle and alaska.
Answered 8/1/2012
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