3 ms·
Canada is so north that at this time of the year it is already not having UVB ray penetration, which is required for the body to make Vitamin D.
by matznerd 12y ago
Canada is so north that at this time of the year it is already not having UVB ray penetration, which is required for the body to make Vitamin D.
- imanaccount247 12y agoI'm in Canada and the UV index (which is based on UVB levels) is still hitting 4 or 5 on clear days. That is above the level where you are recommended to wear clothing, hats, sunscreen, etc to avoid burning. How do you figure that is not enough to produce vitamin D?