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Because it's applied to the skin rather than swallowed, this article doesn't classify it as a dietary supplement - that's a determination best confirmed directly with the brand

Wu et al., 1999)

They can discuss treatment options and help you decide on the best course of action based on your individual needs and goals
Fresno, CA: Linden Publishing

For example, if you take five micrograms, you absorb around 1.2 micrograms
