The layer of skin that you wash are layers of dead keratinized cells in the outermost layer of the epidermis. There are no blood vessels in this layer of skin Vitamin d is synthesized primarily in the innermost layers of the epidermis. Common sense will also tell you that it's not likely that a dead cell is going to be able to transport anything that is synthesized into the dermis where there are blood vessels. Quack-foolery.
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