Why we test

Research peptides and supplements reach buyers without an FDA review. The seller writes the label, and nobody checks it before you pay.

Some vials hold less than the label says. Some hold a different compound. Some pick up bacteria or endotoxin from a careless fill. They all look the same in the box, and a lab test is how you tell them apart.

Southern Diagnostics is an independent U.S. lab in Jersey City, New Jersey. We test peptides, SARMs, research chemicals and supplements for purity, identity and contamination. Every certificate we issue goes into a public database, so anyone holding a vial from the same lot can check it.

How we stay independent

• We don't make or sell peptides, supplements or any product we test.
• Vendors pay the same prices as everyone else and get the same report format.
• Once we issue a certificate, we don't edit or withdraw it at a vendor's request.

How we test

We use methods from the published scientific literature on professional-grade HPLC and LC-MS instruments. Trained analytical chemists run each test and review the data before a certificate goes out. Reports give numbers: purity as a percentage, measured content in milligrams, and endotoxin in EU, so you can compare one lot with another.

The Southern Diagnostics team