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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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?
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How to calculate dosage between oral and scalp-transdermal application?

This is a tricky one. I will give the actual situation, hopefully this will clarify the question. I require medication of the particular small molecule drug (ibuprofen) to my brain over a sustained ...