Evolution has given us the ability to produce vitamin D naturally in our bodies. You can synthesize it just under your skin with sun exposure to your face, arms, hands, or back without sunscreen.
However the seasons, geographic latitude, time of day, cloud cover, skin cover, skin colour, smog, and sunscreen affect how much UV rays you absorb and synthesize.
It is recommended that all Canadians supplement with vitamin D throughout the year.
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