The transdermal route of administration is a route of administration for drugs that entails them seeping through the site on the skin where they are applied, down into the bloodstream where they then gain access to the site(s) of action in the body.

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Applying drugs to brain via scalp (transdermal)

Many medications are intended only for the brain, but are taken orally. Hence <10% finds its intended target, while the remaining >90% is at best wasted, and at worst causes unwanted side-effects. ...
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Can humans transdermally absorb minerals from ocean water, and if so how much?

According to several studies quoted here, chemicals can be absorbed by the skin transdermally, at least under certain conditions. When it comes to elements in seawater like sodium, magnesium, ...
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What Conditions must Drugs satisfy for them to be Deliverable via the Transdermal route?

What Conditions must Drugs satisfy for them to be Deliverable via the Transdermal route? I assume a high $\log{P}$ (lipophilicity) would be one, are there any others?