We aren't the cheapest. We're the best, and we'd rather tell you that up front than pretend otherwise.
Every batch is compounded fresh, flash-frozen immediately, and held in dedicated cold storage at -10°F straight through to the moment it ships. Research peptides aren't shelf-stable commodities. Potency degrades fast when product sits warm in a warehouse for months. Most of what's on the market does exactly that. Ours doesn't.
Every order is third-party lab tested, HPLC and mass-spec confirmed to ≥99% purity, with the actual results on a Certificate of Analysis you can read for yourself. Not marketing numbers, not a recycled screenshot. Real testing from a real lab, every time.
Every order ships vacuum-sealed, cold-packed, and bubble-wrapped in plain, secure packaging, domestically, in 2 to 4 days. No exposure, no guesswork, no compromise on the cold chain.
You can find it cheaper somewhere else. We genuinely invite you to go look, and then ask yourself why you'd want that garbage in your research. Fresh batches, frozen integrity, real third-party COAs, and total transparency. If it has the Excalibur name on it, it's quality. Full stop.
For in-vitro laboratory research use only. Not for human consumption.
Excalibur Peptides is a U.S.-based supplier of research peptides for in-vitro laboratory use only. Every batch is tested by HPLC for purity and confirmed by mass spectrometry for identity, and ships with a lot-specific Certificate of Analysis reporting compound name, lot number, purity percentage, molecular weight, and test methodology. Orders are processed same-day and delivered domestically in 2–4 business days in discreet, cold-packed packaging. Products are not intended for human or animal consumption.
Browse our full catalog of 99%+ pure, third-party tested research compounds organized by signaling pathway and receptor target. For laboratory research use only.
BPC-157, TB-500, Wolverine Blend, KLOW Blend, GHK-Cu — compounds studied for signaling pathways in preclinical models. Each lot is HPLC tested and shipped with a lot-specific Certificate of Analysis confirming purity and identity by mass spectrometry.
GLP-2T, GLP-3R — dual and triple receptor agonists studied in incretin and glucagon receptor signaling research. Sold strictly as reference compounds for in-vitro laboratory study, never for human or animal use.
GHRP-6, Tesamorelin — GHRH analogs and growth hormone secretagogue receptor ligands used in secretion-pathway research. Lyophilized, sealed in glass vials, and shipped cold-packed with domestic 2–4 business day delivery.
NAD+, MOTS-c, SS-31 — mitochondrial-derived peptides and coenzymes studied in AMPK activation, sirtuin signaling, and cellular energy metabolism research models.
Click through to view product details, pricing, purity data, and the lot-specific Certificate of Analysis for each compound.
10mg · >99% purity · $49.99 · Tissue Research · In stock
Body Protection Compound-157, a pentadecapeptide composed of 15 amino acids studied for its interactions with the FAK-paxillin and VEGFR2-Akt-eNOS signaling pathways.
Research-grade BPC-157 — HPLC-verified, mass spec confirmed, COA with every order. Same-day USA shipping. Research use only. Shop Excalibur Peptides.
10mg · >99% purity · $89.99 · Tissue Research · In stock
Thymosin Beta-4 fragment studied for its role in cell migration via G-actin sequestration and actin polymerization in preclinical models.
TB-500 for research — 99%+ purity, HPLC/MS verified, discreet USA delivery. Thymosin Beta-4 fragment for preclinical studies.
10/10mg · >99% purity · $139.99 · Tissue Research · In stock
A dual-compound formulation of BPC-157 and TB-500 designed for synergistic signaling pathway research in preclinical models.
Wolverine Blend — BPC-157 + TB-500 dual-compound formulation for synergistic research. 99%+ pure, COA included, fast USA shipping.
10/10/50mg · >99% purity · $179.99 · Tissue Research · In stock
A four-peptide complex featuring GHK-Cu (50mg), BPC-157 (10mg), TB-500 (10mg), and KPV (10mg) for multi-pathway research studies.
KLOW Blend — GHK-Cu, BPC-157, TB-500, KPV four-peptide complex for research. 99%+ purity, batch COA, fast domestic shipping.
50mg · >99% purity · $64.99 · Tissue Research · In stock
Copper peptide complex studied for its role in collagen and glycosaminoglycan synthesis, metalloproteinase modulation, and antioxidant activity.
GHK-Cu copper tripeptide-1 for tissue-remodeling research. 99%+ HPLC-verified purity, COA every batch, ships same-day from USA. Research use only, not for human use.
10mg · >99% purity · $99.99 · Growth · In stock
Synthetic GHRH analog peptide studied for its binding to GHRH receptors and stimulation of endogenous growth hormone release.
Buy research-grade Tesamorelin — GHRH analog studied for GH axis and visceral fat. Third-party COA every batch. Fast USA shipping. Research use only.
5mg · >99% purity · $39.99 · Growth · In stock
Growth Hormone Releasing Peptide-6 studied for its binding to the ghrelin/GHS receptor (GHS-R1a) and dose-dependent GH release.
GHRP-6 hexapeptide, HPLC + MS verified 99%+ purity, LAL endotoxin tested. COA with every batch, ships from USA. For in-vitro research use only.
10mg · >99% purity · $99.99 · Metabolic Research · In stock
Synthetic peptide used in laboratory research to study incretin receptor binding kinetics and downstream intracellular signaling cascades.
Buy GLP-2T (dual GIP/GLP-1 agonist) — 99%+ pure, batch COA verified, ships same day. US research peptide supplier. Excalibur Peptides.
10mg · >99% purity · $129.99 · Metabolic Research · In stock
Synthetic peptide studied in laboratory research settings for its receptor binding properties and intracellular signaling characteristics.
Buy GLP-3R (GIP/GLP-1/glucagon triple agonist) — 99%+ purity, COA on every batch, fast US shipping. Research use only. Excalibur Peptides.
10mg · >99% purity · $59.99 · Cellular Research · In stock
Mitochondrial-derived peptide encoded within the 12S rRNA gene, studied for AMPK activation and mitochondrial-to-nuclear signaling.
Research-grade MOTS-c 10mg for AMPK and mitochondrial studies. 99%+ purity, HPLC-verified, COA every batch. USA shipping. Research use only.
500mg · >99% purity · $49.99 · Cellular Research · In stock
Nicotinamide adenine dinucleotide — an essential coenzyme studied for its role in over 500 enzymatic reactions and sirtuin substrate activity.
NAD+ 500mg — nicotinamide adenine dinucleotide for cellular energy metabolism and sirtuin pathway research. 99%+ pure, USA shipping.
5mg · >99% purity · $74.99 · Cellular Research · In stock
Cathelicidin-derived 37-amino-acid antimicrobial peptide studied for its interactions with bacterial membranes, immune signaling, and tissue research pathways in preclinical models.
LL-37 5mg — human cathelicidin antimicrobial peptide for innate immunity and tissue research. 99%+ purity, COA included, fast USA shipping.
10mg · >99% purity · $65.00 · Cellular Research · In stock
Mitochondria-targeted tetrapeptide (elamipretide class) studied for its selective association with cardiolipin on the inner mitochondrial membrane and its effects on electron transport efficiency in preclinical models.
Research-grade SS-31 10mg for cardiolipin-binding studies. 99%+ purity, HPLC-verified, COA every batch. Research use only.
10mg · >99% purity · $60.00 · Cognitive Research · In stock
Synthetic heptapeptide analog of the endogenous immunomodulator tuftsin, studied for GABAergic and monoamine pathway modulation and BDNF expression in preclinical neuroscience models.
Buy research-grade Selank 10mg (tuftsin-derived heptapeptide for GABAergic and BDNF research). 99%+ purity, HPLC-verified, COA every batch. Research use only.
10mg · >99% purity · $60.00 · Cognitive Research · In stock
Synthetic heptapeptide derived from the ACTH(4-10) fragment, studied for BDNF/NGF expression, monoaminergic signaling, and neurotrophic pathway activity in preclinical models.
Research-grade Semax 10mg for BDNF and neurotrophic studies. 99%+ purity, HPLC-verified, COA every batch. Research use only.
PT-141 (bremelanotide): cyclic melanocortin agonist researched for MC4R pathway activation. HPLC-verified ≥98% purity. Research use only.
SLU-PP-332: synthetic pan-ERR agonist researched as an exercise mimetic in metabolic models. HPLC-verified ≥98% purity. Research use only.
Snap-8 (acetyl octapeptide-3): SNARE-complex peptide researched for competitive inhibition of acetylcholine release. Topical research use only.
Ara-290 (cibinetide): 11-amino-acid EPO helix-B peptide selectively activating the innate repair receptor. ≥98% purity. Research use only.
CJC-1295 (GHRH analog) and Ipamorelin (GHS-R1a agonist) researched together for synergistic pulsatile GH stimulation. Research use only.
Verified, third-party reviews from researchers on Trustpilot. Rated 4.7 out of 5 from 32 verified reviews on Trustpilot. Read all reviews on Trustpilot.
Free reference content and guides for in-vitro research workflows. Not medical advice.
Side-by-side comparison of US-based research peptide suppliers on purity, COA, and operational coverage.
Catalog overview of in-vitro research peptides with purity and COA standards explained.
What domestic U.S. fulfillment means for research laboratories — shipping, customs, and lead times.
Context on the 2026 shutdown and what a like-for-like research supplier should provide.
Factual GHRH-analog reference: research areas, molecular weight, and FAQs.
Lot-specific COAs for every catalog compound, viewable inline in the browser.
Check that the COA references the exact lot number printed on your vial, names the independent testing laboratory, and reports both HPLC purity (≥99%) and a mass-spectrometry identity match against the calculated molecular weight. A generic or undated COA that is not lot-specific should not be accepted as batch verification.
High-Performance Liquid Chromatography separates the components of a peptide sample and quantifies each peak. The purity percentage on a COA is the area of the target-peptide peak as a fraction of all detected peaks — measuring how much of the sample is the intended sequence versus truncated peptides, deletion sequences, or synthesis byproducts.
Mass spectrometry (typically LC-MS with electrospray ionization) measures the molecular weight of the peptide in the vial. Identity is confirmed when the observed mass matches the theoretical molecular weight calculated from the peptide's amino-acid sequence. Purity without identity confirmation is not sufficient — both tests are required to verify a batch.
Lyophilized (freeze-dried) peptides ship in sealed glass vials with temperature-controlled domestic delivery in 2–4 business days. Unopened lyophilized vials are stored refrigerated (2–8 °C) or frozen (−20 °C) for long-term storage. Once reconstituted, peptides are refrigerated and used within the timeframe specified by the research protocol.
"For in-vitro laboratory research use only" means the compound is sold strictly for non-clinical scientific study in laboratory environments. It is not a drug, not approved by the FDA for human or veterinary use, and is not intended for human or animal consumption, injection, or therapeutic application.