Sterility testing might cost more than filtering does.
For the last several months on this forum I've picked up a lot from experienced members and changed my mind on a few topics. One is how important filtering is, so now I filter nearly every peptide. There are plenty of threads on filtering already, but none seem to answer these exact points. If a peptide has full testing including sterility, endotoxins and metals, is filtering still needed? And for pharma-grade glutathione or HCG, should they be filtered too? I'm currently not filtering those.