GLP-3 R
Our best-selling triple-agonist research peptide — GIP, GLP-3 R and glucagon receptor activity in a single lot-matched vial. Synthesized by solid-phase synthesis, verified to ≥99% by mass spectrometry, and backed by a downloadable Certificate of Analysis for every lot.
$120.00
Shop the Catalog
The Research Catalog
70 research compounds across 9 categories — each synthesized to analytical standards and verified against a lot-matched Certificate of Analysis.
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GLP-1 & Metabolic
SS-31
Price range: $50.00 through $75.00 Select options This product has multiple variants. The options may be chosen on the product page
Beyond Purity
What 99% pure doesn't tell you.
Purity testing measures one thing. We test for the four things it can't see.
Every peptide supplier publishes a purity number. But HPLC and mass spectrometry — the tests behind that number — were never designed to detect contamination. They measure the molecule, not what’s around it. A peptide can test 99.9% pure and still contain bacterial endotoxins, heavy metals, or microbial growth. The chromatogram won’t show it. Most suppliers won’t test for it. We do.
01 — Endotoxins
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.
02 — Sterility
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.
03 — Heavy Metals
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.
04 — Batch Consistency
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.
Purity is the floor. Not the ceiling.
Answers
Frequently Asked Questions
Are these products third-party tested?
Purity matches the COA every time. Shipping is genuinely same-day. I’ve reordered 11 times and Altus Peptide Lab is the only supplier I trust for my work.
What does 'Research Use Only' mean?
All products are supplied strictly for laboratory and research use only (RUO). They are not drugs, foods, supplements, or cosmetics, are not approved by the FDA, and are not intended to diagnose, treat, cure, or prevent any disease, or for human or veterinary consumption.
How fast do orders ship?
Orders placed before 2 pm EST CT typically ship the same business day from our U.S. fulfillment center, in protective packaging with tracking provided. Free shipping on orders $300 and over.
How should these compounds be stored?
Store lyophilized material at -20°C, protected from light and moisture. Once reconstituted with bacteriostatic water for laboratory titration, refrigerate at 2–8°C. Always consult the product COA for compound-specific handling.
Do you provide a Certificate of Analysis?
Yes — a lot-matched COA is available for every product and every batch, documenting identity, purity, and analytical results. Contact our team if you need the COA for a specific lot.
Why Researchers Choose Us
The Standard in Research-Grade Peptides
Six commitments. Independently verified. Every one backed by a number, not a claim.
Verify this test at www.js-compliance.com with the following unique key
Verify this test at www.js-compliance.com with the following unique key
Verify this test at www.js-compliance.com with the following unique key
Verify this test at www.js-compliance.com with the following unique key
Verify this test at www.js-compliance.com with the following unique key
Verify this test at www.js-compliance.com with the following unique key
Verify this test at www.js-compliance.com with the following unique key
Verify this test at www.js-compliance.com with the following unique key
COA Certified
Every batch tested
99%+ Purity
Lab-verified
Same-Day Ship
Orders by 2PM EST
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USA-Based
Domestic sourcing