Researchers have found that vitamin D levels in the U.S. population peak in August and bottom out in February. The essential vitamin -- necessary for healthy bones -- is produced in the skin upon exposure to ultraviolet B rays from the sun.
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/M...
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/M...