Increasing Vitamin D3
When the skin is exposed to UVB light, the Cholesterol in the skin is transferred into Vitamin D3.
In general the skin does not need much of the UVB energy to generate vitamin D3, and 15 minutes of strong sunshine every day are enough.
In Northern European countries pregnant women receive UVB light in clinics so that their babies will have more vitamin D3 when born.
UVB light does not tan the skin very much, compared to UVA lamps that are used in tanning beds.
Animals need to UVB light for Vitamin D3 and strong bones. In the Zoo there are UVB lamps for reptiles. Reptile keepers within the home environment can purchase UVB/UVA emitting bulbs from pet stores to provide their reptiles with the required amount of UVB/UVA they need to generate vitamin D3. Such lights are branded Creature World or Repti Glo and used for a period of 10-12 hours per day to give required exposure. These lamps simulate the sun spectrum and they give mostly visible light and a very small amount of UVB light, like the sun gives. Vitamin d3 in Wikipedia
Read more about this topic: UV-B Lamps
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