I see at least three sources of problems.

1. Test it for mass, purity, endotoxins, whether it is the real deal or not; this can be easily mitigated if one joins some testing group to share costs.

2. Calculate the dosage units properly, as it depends on how much bacteriostatic water is mixed with the powder. Here, many peptide calculators help. Some will end up making mistakes here; instead of taking 5 units, one will take 50 units--this leads to ER visits.

3. Hygiene: use gloves and alcohol wipes.