One is the online market of research-grade powders labeled not for human use. The other is a small number of medical clinics that actually evaluate you, prescribe a compounded protocol, and supervise it
For example, a powdered antibiotic or peptide vial instructions may say add X mL sterile water for injection. In many cases, practitioners use bacteriostatic water (when allowed) so that one vial can serve multiple doses
If the vial was left out overnight, the solution may still be usable, but potency could be reduced
Lyophilized (unmixed) peptide powder lasts 1824 months when stored correctly
It did take a few months to settle
Blackmarket needles, self-sourced substances, and using your own needles