What is the best time to get Vitamin D3 by exposure to sunlight?

Answer 1

AJ, it actually depends. Also, I must stress that not every sunlight exposure can give you Vitamin D synthesis. Basically, it is recommended that an individual get sun exposure of ten to fifteen minutes at least twice a week. It is also recommened in the morning when the sun is up at 45 degrees over the horizon. The face, neck, arms, hands, or the back (if this can be done) must be exposed to the sun during these sunlight-exposure sessions.

However, as I have initially said, there are other factors at work that help trigger inactive Vitamin D into active Vitamin D. The UV rays (ultraviolet rays) of the sun must have enough energy to start the Vitamin D synthesis in the skin. There are days in the year when the sun shines but just doesn't have the sufficient energy capable for this start-up. The geographic location also plays an important role in things. As an example, between October to mid-April, not enough solar energy crosses north of the line that stretches from LA to Atlanta. Another example of this is Boston during November through February, when the rays of the sun are insufficient to start-up Vitamin D synthesis in the skin. Industrial pollution and clouds also play a role in the lessening of UV rays.

Remember that over-exposure to the sun's rays is also not good. Please click on the link below for further details into this subject matter:

Answer 2

Anytime, really.
Between the hours of 10 am to 2 pm, all you need is about 15 minutes on a small patch of skin. If it's on your arms, a few minutes is all that is necessary.