Skin Endocrine Function - Anatomy & Physiology

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Hormones have a large effect on the skin, details of which can be found at Skin - Anatomy & Physiology - Endocrine & Nutritional Influences. As a result [Endocrine effects on the skin|Endocrine associated skin pathology]] is relatively common.

The skin is also a producer of Vitamin D., the precursor of the hormone Calcitriol.

7-dehydrocholesterol is converted to Vitamin D by Ultraviolet radiation at wavelength 300nm. This is not a major source in animals as the majority of the skin is covered by hair in many species.

Vitamin D is then hydroxylated into it's active form, Calcitriol in the kidney.