Why Cant This Be Used To Apply Propecia Topically?

abcdefg

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I saw this today, and just wondered why cant we have something like this to apply propecia topically? Or apply it, and have it slow release for a month? Yes, it might go systemic still almost for sure but still. You still might get higher dose locally where it matters and less everywhere else. Hell put some RU or CB on these needles and blow away the ARs topically where you needle your scalp with these.
Where is the treatment besides propecia?

https://www.telegraph.co.uk/news/2019/01/14/micro-needles-could-future-long-lasting-contraception/
 
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