There ARE supplements and drugs that are best administered by routes that bypass the stomach/GI tract for one reason or another. Google will provide numerous reasons as to why this may be important.
Not sure what you mean by "powder form" in the bloodstream, though.
My guess is if you dumped an Epistane capsule out into your mouth you would eventually just end up swallowing it anyhow due to increased salivary output which would result from keeping that shit floating about in your mouth. I'm sure Tyson K or MODOK would be better able to clue you in on sublingual/buccal formulations, but I would imagine that drugs designed for oral use are best used... orally.
It is also concerning that your sole post in the APPROPRIATE forum (though the attempted thread hijack was in poor taste) implies you are considering an 8 week cycle of this PH, but you really should start a thread in the Steroids section (or PM a mod requesting this thread be moved there) for better input.
In fact, based on these two posts, you should probably reconsider Epi altogether until you have adequately educated yourself on the topic.