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Research-grade peptides, documented down to the lot

Peplogy research peptide vials in a laboratory

Pure peptides. Real results.

Research-grade peptides for those who demand the highest standard.

  • 99%+ Purity
  • Lab tested
  • Research grade
  • Made in the USA
Shop the CatalogView COAs
  • 99%+ HPLC & MS verified purity
  • 100% Of lots third-party tested
  • 840+ Researchers served
  • 7 Quality checks per lot

Volume pricing Save 8% on 3 vials and 12% on 5 or more — applied automatically at checkout See how →

#1 Research peptide

Retatrutide (GLP-1 RT)

Our most-ordered research compound, built by solid-phase synthesis, confirmed by mass spectrometry, and shipped with the COA for its exact lot.

from $35

Shop Retatrutide (GLP-1 RT) All GLP-1 & Multi-Agonists Peptides
  • COA Certified Every lot tested
  • ≥99% Purity HPLC + MS verified
  • Same-Day Dispatch Orders by 2 PM ET
  • Secure Checkout 256-bit encryption
  • US-Based Team Real people, fast replies

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The Research Catalog

83 research compounds across 9 categories — each one synthesized to analytical standards and released against a lot-matched Certificate of Analysis.

Bioregulators 3 products

Capsules 24 products

View all 24 →

GLP-1 & Multi-Agonists 5 products

Metabolic 20 products

View all 20 →

Nasal Sprays 7 products

Peptide Blends 25 products

View all 25 →

Research Bundles 12 products

View all 12 →

Research Peptides 36 products

View all 36 →

Serums 3 products

Beyond purity

What “99% pure” doesn't tell you.

Purity testing measures one thing. We also test for the four things it can't see.

Almost every supplier publishes a purity number. But HPLC and mass spectrometry were built to measure the molecule — not what's sitting around it. A peptide can test 99.9% pure and still carry endotoxins, heavy metals or microbial growth. The chromatogram won't show it, so we test for it separately.

  • 01 — Endotoxins

    Bacterial fragments that survive sterilization.

    Heat-stable and biologically active on their own.

    Why purity testing misses it

    HPLC and mass spec measure the peptide itself. Endotoxins are biological residue that neither test can see — a vial can read 99% pure and still carry them.

    Why it matters

    Endotoxins trigger immune and inflammatory signaling in cell models, which can distort results before an experiment even starts.

  • 02 — Sterility

    Confirmation that nothing is growing in the vial.

    Cultured against USP methods — not assumed from a clean chromatogram.

    Why purity testing misses it

    Purity tests never culture for bacteria, fungi or yeast. Live contamination can grow in material that passed every chemistry test.

    Why it matters

    Microbial growth adds unknown variables to every assay run with that material.

  • 03 — Heavy metals

    Lead, arsenic, mercury and cadmium from raw materials.

    Inorganic — only detectable by ICP-MS.

    Why purity testing misses it

    HPLC and mass spec are blind to inorganic contaminants. Finding them takes a separate test most suppliers skip.

    Why it matters

    Trace metals can interfere with enzymatic and cell-based assays and quietly confound results.

  • 04 — Batch consistency

    Proof that this batch matches the last one.

    Multiple samples, same reference standard, every time.

    Why purity testing misses it

    Testing a single vial per run is the industry norm. We sample across the batch and compare it to the same reference.

    Why it matters

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

Purity is the starting line. Not the finish.

Shop by research area

Find Your Compound

Not sure where to start? Browse the catalog by the pathway you're studying.

Most popular

Bestselling Compounds

The research peptides our verified customers reorder most.

US-based · Built on data

Tested & shipped
in the U.S.A.

Peplogy is built on documented quality control. Every lot is tested before release and fulfilled the same day from our facility in Dallas, Texas — and the analytical paperwork travels with every order.

Shop Metabolic Why Peplogy

Why labs choose Peplogy

The Standard in Research-Grade Peptides

Six commitments — each one backed by a number, not a slogan.

  • Independent Testing

    Every lot is verified by [Independent lab] — HPLC purity, mass-spec identity and endotoxin screening.

    99.7%

    average purity · last 50 lots

  • Same-Day Dispatch

    Orders placed by 2 PM ET ship the same day — tracked, insured and cold-packed.

    2–3 days

    average domestic delivery

  • Damage & Error Cover

    Wrong item, damaged in transit or missing from your order? Tell us within 30 days of delivery and we replace it or refund you, free.

    30 days

    to report · free replacement or refund

  • US-Based Operations

    Tested, packed and shipped by our team in the United States.

    100% US

    testing · packing · shipping

  • Verified Accounts

    Every account is reviewed by our team before approval, keeping supply reliable for real research.

    1 day

    typical approval time

  • Expert Support

    Real people who know the products — COA, storage and ordering questions welcome.

    <6 hrs

    average first reply · weekdays

Verified by Testing lab HPLC-MS lab GMP Compliant facility 256-bit SSL Encrypted checkout 0.05 EU/mL Endotoxin verified
The testing standard

Every lot clears 7 independent checks before it's listed for sale.

Many sellers ship on a supplier's word. Every Peplogy lot goes through independent third-party testing — and if any check fails, that lot never reaches you.

  1. 14

    Days · Sterility

    USP sterility testing runs a full 14-day incubation — because slow-growing organisms don't appear in a rushed two-day check.

  2. Endotoxin Testing (LAL)

    Endotoxins are invisible, heat-stable and can invalidate a whole study. We screen every lot against USP limits.

  3. Purity — HPLC

    High-performance liquid chromatography confirms ≥99% purity and quantifies every impurity — measured and printed on the COA.

  4. Heavy Metals — ICP-MS

    Screens for lead, arsenic, cadmium and mercury down to trace limits — contaminants that carry over from raw materials.

  5. Identity — Mass Spectrometry

    Confirms the molecular weight matches the exact sequence on the label — proof it is what it says it is.

  6. Batch Consistency

    Multiple samples per batch, compared to the same reference, so vial 900 matches vial 1.

  7. Net Content

    The milligrams on the label are the milligrams in the vial — net peptide content is assayed on every batch.

Independent third-party verification — every batch, no exceptions.

Research sets

Featured Research Bundles

Curated multi-compound sets at a saving versus buying each vial on its own. Every component ships with its lot-matched COA.

View all bundles

Verified lab testing

Certificates of Analysis & Safety Data

Every compound is independently tested, with a lot-matched Certificate of Analysis (COA) and a GHS-format Safety Data Sheet (SDS) ready to download.

Semaglutide / BPC-157 Blend (GLP-1 SM / BPC-157)

Epithalon

Ipamorelin

Tesamorelin

Tesamorelin / Ipamorelin Blend

AOD-9604

PT-141

CJC-1295 / Ipamorelin Blend

Thymosin Alpha-1

GHK-Cu

Semax

Selank

Search all COAs by lot number

Why Peplogy

A Standard You Can Verify

We publish the proof. Every product is backed by analytical testing and lot-level documentation — no guesswork, no black boxes.

  • Analytical Purity

    ≥99% purity verified by HPLC and mass spectrometry. Each lot is characterized before release, so your assays start from a known baseline.

  • COA on Every Lot

    A lot-matched Certificate of Analysis documents identity, purity and test results — for every product, every batch.

  • US Fulfilment

    Tested before release and shipped the same day from the United States, with tracking on every order.

Research-Grade Peptides for Sale in the USA

Peplogy supplies research-grade peptides to laboratories and qualified researchers across the United States. Our catalog of 83 research compounds covers single research peptides, peptide blends, GLP-1 and multi-agonist peptides, bioregulators and metabolic compounds, and every lot is released with a Certificate of Analysis for that exact lot.

Research Peptides in Every Format

Most research peptides ship as lyophilized (freeze-dried) powder in sealed glass vials, the most stable format for storage and transport. We also supply research peptides as 60-count capsule bottles for oral-format studies, ready-to-use nasal sprays, topical serums, and three-vial research bundles priced 10% below buying each vial separately. Browse peptide vials, peptide capsules, nasal sprays, research bundles or the full catalog.

How We Test Research-Grade Peptides

Every lot is characterized by HPLC for purity and by mass spectrometry for identity before it is listed for sale, and each lot clears 7 quality checks. The matching COA is published in our COA library, so you can check a lot before you buy. The analytical methods behind these checks are covered in the peer-reviewed literature on PubMed.

Buy Peptides Online with Same-Day Dispatch

When you buy peptides online from Peplogy, orders placed by 2 PM ET on business days are dispatched the same day from our facility in Dallas, Texas, with tracking on every order. Most domestic orders arrive in 2–3 business days, shipping is free on orders over $150, and volume pricing is applied automatically at checkout when you order several vials.

For Research Use Only

All research peptides for sale at Peplogy are supplied strictly for laboratory research. They are not drugs, foods, supplements or cosmetics, and are not for human or veterinary use. See our research use policy for details.

Answers

Frequently Asked Questions

Are these products third-party tested?

Yes. Every lot is independently tested for identity, purity and contaminants before release, and the full Certificate of Analysis is published for that lot.

What does 'Research Use Only' mean?

Our products are supplied only for laboratory research. They are not drugs, foods, supplements or cosmetics, and are not for human or veterinary use.

How fast do orders ship?

Orders placed by 2 PM ET on business days ship the same day, with tracking. Most domestic orders arrive in 2–3 business days.

How should these compounds be stored?

Store lyophilized vials at −20 °C, away from light and moisture. Each product page and its Safety Data Sheet include compound-specific handling notes.

Do you provide a Certificate of Analysis?

Always. The COA for your exact lot is printed in the box and available to download from the product page and our COA library.

Still have questions? Email us
  • Every order ships with the COA for its exact lot
  • Same-day dispatch by 2 PM ET
  • Free shipping over $150