Hey everyone, I see a lot of new folks asking about expiration dates on their research compounds. It's a super important topic for safety and efficacy, so I wanted to share some thoughts. First off, the expiration date you see on a vial or bottle is usually for the lyophilized (powder) form. This is generally pretty stable when stored correctly, like in a freezer or fridge, away from light and moisture. Think years, not months, for many compounds. Once you reconstitute a peptide with bacteriostatic water, things change. The stability dramatically decreases. Most reconstituted peptides are good for a few weeks to a couple of months when refrigerated. Some are even shorter. It's always best to check the specific research for each peptide you are working with. There's a ton of variability. And always label your reconstituted vials with the date you mixed them up! This helps avoid confusion and keeps your research accurate. Don't risk your precious research by using something that's gone bad.