When using injectable snap8, do you need to inject in the area you want tightened, or can you inject subq anywhere? Also, can you use injectable snap 8 topically?

Has anyone tried this? I just bought a 1g vial, but can’t find any reconstituting or administering instructions. Apparently, this is a new format, so not sure if I’m supposed to reconstitute & use topically, or as an injection?

I hear about a lot of people combining peptides into 1 vial to avoid so many injections. Is there a general rule as to what can be combined & what can’t?