Worried that your sunscreen may be blocking your intake of Vitamin D?

It's definitely the season to slather on the anti-sun stuff.

And take note: clouds are not sunscreens.

But studies show that, even when we use sunscreen, we're not terribly efficient about it.

And that's why we still get some of the Vitamin D from the sun in summer, even if we're heavily into the Coppertone.

Here's why:

* Sunscreen, by definition, screens out most of the sun's harmful ultraviolet rays – but not all.  It's not "sunblock."

* If you use a product with an SPF 30, for example, one-thirtieth or 3.3 per cent of the radiation, the majority of which is UVB, is transmitted.

* Sunscreens are almost never applied in a concentration that provides the level of protection tested and advertised on the bottle or tube.

* The tested level that determines the SPF is 2 mg. per centimeter squared. Studies have found that most people use only about 0.5 mg.

* That means a sunscreen supposedly providing SPF 16 protection is actually providing only SPF2 when the typical 0.5 mg is applied.

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