Thinking over those points feels worthwhile to me. Is buying a sterilizer device even realistic budget wise? Maybe putting together an airflow enclosure on your own could work. Protective handwear comes up too. Air movers? Methods using light waves or gas for cleaning? A fully isolated sterile space? Might that end up affecting the peptides? It gives a starting place for figuring out your path. Shape things around what suits you best. I'm pretty elusive by nature. Sharing my own exact routine probably wouldn't help much anyway.
Even when people follow careful methods the risk of germs getting in could still go up instead. That fresh container wasn't clean from the start and picked up something by accident. The strainer for the injection tool carries contaminants as well. The steps used for straining and managing everything fall below proper lab levels. Those odds drop a lot with a clean air cabinet a pressure sterilizer and standard hygiene rules in place. To what extent do these get used?