Vitamin D taken with food constitutes 10% of the total vitamin D in the body. Asst. Prof. Dr. Ayse Huri Ozkarabulut from Istanbul Gelisim University (IGU) Health Sciences Faculty Nutrition and Dietetics Department remarked the following: Egg yolk, beef liver and fish oil are the best-known sources of vitamin D. 90% of the vitamin D in the body is synthesized in the skin under the effect of sunlight.
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