> That size filtration will filter out any lifeforms (fungal, bacterial, viral) while allowing the peptide/drug itself to pass through 0.22 won't filter out vi

> That size filtration will filter out any lifeforms (fungal, bacterial, viral) while allowing the peptide/drug itself to pass through 0.22 won't filter out viruses, but time will inactivate enveloped viruses (which are usually the ones you want to avoid injecting), and source control/proper handling should take care of the rest.