Toxic fragments left behind by dead bacteria.

Heat-stable. Survive sterilization. Biologically active on their own.

Why purity testing misses them

HPLC and mass spec measure chemistry. Endotoxins are biological remnants — invisible to both. A vial can be 99% pure and still loaded with them.

Why it matters

Endotoxins are biologically active. They trigger immune responses, inflammation, and cytokine release on their own — corrupting research data before the experiment begins.

The absence of living microbial contamination.

Cultured against USP standards. Not assumed from a clean chromatogram.

Why purity testing misses it

Purity tests don’t culture for bacteria, fungi, or yeast. Live contamination can grow in a vial that “passed” purity testing.

Why it matters

Microbial growth introduces unknown variables into every experiment. We test every batch against USP sterility standards.

Lead, arsenic, mercury, and cadmium introduced during synthesis.

Inorganic. Invisible to HPLC and mass spec. Detected only by ICP-MS.

Why purity testing misses them

Heavy metals are inorganic. HPLC and mass spec are blind to them entirely. They require a separate test (ICP-MS) most suppliers skip.

Why it matters

Heavy metals accumulate in biological tissue and produce confounding effects in long-term studies. We screen for all four primary contaminants on every batch.

Verification that every batch matches the last.

Multi-sample. Reference-tested. Reproducibility, audited.

Why most suppliers miss it

Spot-checking one vial per run is industry standard. We pull multiple samples per batch and test against the same reference every time.

Why it matters

Reproducibility is the foundation of legitimate research. If batches drift, your data drifts with them.