Dermal (skin patch) or sublingual peptide applications?

[Rock Solid1]

Has anyone experimented with alternate peptide delivery mechanisms other than oral or direct injection? I have seen some companies offering skin patches or tongue strips and wondering if these can or would be effective. I see how this would be nice for peps like GHK-cu since the injections aren’t always the most pleasant.

Anyone have a direct comparison or anecdotal experience?