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. Author manuscript; available in PMC: 2010 Mar 27.
Published in final edited form as: Photodermatol Photoimmunol Photomed. 2007 Oct;23(5):179–185. doi: 10.1111/j.1600-0781.2007.00302.x

Fig. 2.

Fig. 2

Percentage of pre-vitamin D3 formed after exposing ampules containing 7-dehydrocholesterol (7-DHC) to a portable tanning machine at several times and distances (◆, 14 inches; ■, 20 inches; ▲, 26 inches). Ampules containing 7-DHC (pro-vitamin D) were exposed to a portable tanning machine at several distances and times to determine the optimal conditions for vitamin D production in the skin. Vitamin D production was optimal at 14 cm from the device and an exposure time between 10 and 15 min.