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.

The skin itself also produces at least one hormone precursor - Vitamin D. 7-dehydrocholesterol can be 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.

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