But people with "higher levels of melanin absorb and block UVB radiation, thereby reducing the amount of vitamin D the skin can produce," she adds. But what's going on biologically when darker ...

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using too much sunscreen and having naturally high levels of melanin, diminish the skin’s ability to produce vitamin D. Deficiencies often go unnoticed, with only those that are extreme and ...

Obviously I was quite shocked and upset." She was surprised because she had believed a long-perpetuated myth that high levels of melanin in black skin meant it could not be damaged by the sun.