I have used amazon filters for oils and they seemed to do a good job. You need to make sure they are sterile filters and come individually wrapped. I think for peptides you need hydrophyllic filters with a PTFE or nylon membrane (someone correct me if i am wrong). For oils it doesnt matter if you use hydrophyllic or hydrophobic filters, but peptides and hgh it matters. But ghoul and other members know much more than i do when it comes to filtering peptides, so its better to wait for confirmation.
I am not 100% sure if PTFE and nylon is suitable for peptides because i do not have experience filtering them. But PTFE is good for oils because it is resistant to the solvents used in oils