Is there any issue if these happen to overlap during application? My high school chemistry thinks there might not be a problem, but it could very well be wrong.

Dear Derek,

That is a great question! I don't think so, but I am not sure. I am looking forward to Dr. Pickart's response.

Thank you
~The SkinBio Team

I don't think you have to worry about any explosions occurring...but I think CPs may kill the tin if used together. Best to alternate if using both

Not 100% sure on that... ...only your hairdresser (I mean Dr. P) will know for sure!

There should be no problem in a free days. Both metals are relatively un-reactive.

But we don't mix them in products because the ionic tin and ionic copper may slowly react but nothing toxic is created.

Derek I've used the FFB (tin peptide) since January. Copper peptides on the face. I'm sure they have overlapped many, many times. No rust, corrosion or explosions to report.