Season and location are factors too.
In the winter in the SF bay area, it's very unlikely your skin can make enough vitamin D.
After one winter here, I my D levels were at 20 ng/ml -- way below what many believe is the sufficient level of 30 ng/ml.
In the winter in the SF bay area, it's very unlikely your skin can make enough vitamin D.
After one winter here, I my D levels were at 20 ng/ml -- way below what many believe is the sufficient level of 30 ng/ml.
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