Not all research peptides are made the same way. There are two main methods:
🦠 Fermented (recombinant): the peptide is grown inside bacteria or yeast, then separated out. When bacteria are used, they can leave behind endotoxin, a bacterial leftover that can throw off lab and cell-culture results. Removing it takes extra cleanup, and a standard purity test won't detect it. Endotoxin needs its own separate test.
⚗️ Synthetic: the peptide is built chemically, one building block at a time. No bacteria are involved in making it, so bacterial endotoxin isn't built into the process.
💬 Question for you: has a vendor ever told you how their peptides were made? Most don't say. Ask them.
For Research Use Only. Not for human or animal consumption.