HGH and penetrate

Molecular weight. If it were viable, a major drug company would've been all over it a long time ago.
 
Molecular weight. If it were viable, a major drug company would've been all over it a long time ago.

The closest they've come is experimental intranasal administration of certain hexa-peptides (ghrps) and transbuccal insulin/igf-1 compounds (iplex)- however their effectiveness was limited/ considerably inferior to their injected counterparts. Not to mention costly.
 
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