Where to get peptides.

You can get peptides from a research-supply vendor online, from a pharmacy on prescription, or from a 503A compounding pharmacy. Four more channels exist that are not a storefront at all. The answer to where to get peptides depends entirely on which compound you want, and for most of the popular ones only the first channel is open.

Tesamorelin and BPC-157 come from different places, and the difference is not about the seller. It is about whether the molecule has ever been through an approval, and what that changes legally.

Where can you get peptides?

Seven channels, with what each one covers, what it asks of you, and where it runs out. Four of them are not a website.

Three of the seven involve a checkout. The other four are a prescriber, a trial, a supplement shelf that does not stock this category, and a border. Which of them is open to you is settled entirely by the compound.

Which channel is open for your compound?

Peptides sort themselves by one test: does the compound have a brand name? If it does, a prescription channel exists. If it does not, there is nothing for a prescriber to write.

Tesamorelin is Egrifta. Semaglutide is Wegovy and Ozempic. Tirzepatide is Zepbound and Mounjaro. PT-141 is Vyleesi. Those four you can get at a pharmacy.

Everything without a brand name has no prescription channel at all. That covers BPC-157, TB-500, epithalon, GHK-Cu, the Khavinson bioregulators, and retatrutide while it stays in Phase 3. For those, the research-supply channel is the whole market.

What can you get near you, in person?

Less than the search suggests, and it is worth being direct about why. There is no retail counter for research peptides anywhere in the US. A shop selling vials to walk-in customers would be marketing them for human use, which is the one thing the labeling that makes the sale lawful forbids.

• A local clinic or telehealth service. Real, and a legitimate channel. It prescribes approved or compounded peptides with oversight attached.
• A retail pharmacy. Dispenses the four approved peptides on a prescription, and stocks bacteriostatic water, which is the one item in this category with a genuine walk-in answer. Some pharmacies ask for a prescription for it and many do not, because it is a diluent rather than a drug.
• A compounding pharmacy. Prepares from approved active ingredients, per patient, on a prescription.
• A vitamin aisle. Collagen peptides, which are a hydrolyzed food protein taken by the scoop. Not what this site covers.

What is genuinely available near you goes through the local channels in detail.

What does the online channel ask you to trust?

Every other channel arrives with somebody standing behind it. A pharmacist. A prescriber. A trial protocol. This one does not. The vendor is the whole quality system, which is why the choice of vendor matters more here than on any other row of that table.

• What the channel gives you. Access with no gatekeeper, delivery in days, and a price roughly an order of magnitude under a clinic's.
• What it withholds. Sterility, endotoxin testing, fill accuracy and anyone with the power to recall a bad lot.
• What replaces them. A document. That is the whole substitution, so the document has to be real: third party, lot-matched, and signed by a lab you can name. How to read one.
• What the labeling commits the vendor to. No dose, no route, no health claim. Research use only, in practice.

Seven checks, scored across ten vendors is how to test that document before you order. For what those vendors charge, ten of them are priced side by side, and the eight-criterion framework ranks them by name. Per-compound sourcing lives in the A–Z index.

Where do you buy each compound?

The channel is the same for most of this list: a research-supply vendor, online. What changes compound by compound is the check. Each entry below gives that check, the substitution it catches, and the price band at third-party tested retail in 2026.

Four compounds carry enough demand to have their own sourcing guide: BPC-157, tirzepatide, retatrutide and tesamorelin. The rest live here. For what the same vendors charge across the board, ten of them are priced side by side.

“Not benchmarked” means we did not verify a price for that compound. It is not a comment on the compound. Where a band is given, it is what third-party tested material sells for, not a quote from one vendor.

Where to buy 5-Amino-1MQ

Research-supply vendors online, and nowhere else. It is not a peptide at all. It has zero amino acids and weighs just 159 g/mol. Ask for CAS 42464-96-0 on the identity line. A mass-spec ion at m/z 159.1 confirms it; a purity percentage on its own does not. Expect $50–$150 for a 50 mg vial, or roughly $1–$3 per mg. That is about a tenth of what BPC-157 costs by weight. The full guide covers the NNMT mechanism.

Where to buy adipotide

Research supply only. No pharmacy stocks it, and the primate work that made it famous is also what stopped it. The construct is CKGGRAKDC-GG-D(KLAKLAK)₂, 25 residues, about 2611 g/mol. Mass spec should be consistent with that full chimeric molecule, not with a fragment of it. Tested vials run $85–$180 per 10 mg and $55–$110 per 5 mg. Below roughly $45 per 10 mg vial, ask which synthesis step was skipped. The full guide has the renal toxicity record.

Where to buy argireline

Research and cosmetic-ingredient suppliers online. The certificate should carry CAS 616204-22-9 and a molecular weight of 889.0 g/mol. Peptide content should be stated in milligrams. A bare percentage describes the carrier solution, not the peptide. The substitution to catch is the non-acetylated hexapeptide. It weighs roughly 847 Da, and it is not the compound the published work used. Expect $25–$55 per 10 mg vial and $60–$110 for 50 mg. The full guide covers the SNARE mechanism and the 500-dalton skin-penetration limit.

Where to buy cagrilintide

Two routes exist, and only one is yours to choose: a research-supply vendor, or a clinical trial you have to qualify for. No regulator has approved cagrilintide, alone or as half of CagriSema. So there is no pharmacy route and no script to write. On its own in Phase 2 it cut body weight about 9.7%; paired with semaglutide, REDEFINE-1 reported about 20.4%. Almost nobody looking for it wants it alone. One certificate covering a mixed vial establishes the identity of neither peptide in it. The full guide has the trial record.

Where to buy CJC-1295

Research supply only. The name settles nothing on its own, so make the vendor state which variant the vial holds. DAC has a half-life of 6–8 days. No-DAC clears in roughly 30 minutes. CAS 863288-34-0 is the no-DAC registration, and its theoretical mass is 3367.9 g/mol; DAC carries a separate CAS. Expect $50–$100 for a 5 mg no-DAC vial and $80–$150 for the same size in DAC. The full guide explains why that one modification changes everything else.

Where to buy the CJC-1295 / ipamorelin blend

Research supply, as a co-lyophilized vial. The certificate should carry two CAS numbers on one report: 863288-34-0 for CJC-1295 no-DAC and 170851-70-4 for ipamorelin. It should also report two masses, 3367.9 and 711.9 g/mol. Peptides the size of CJC-1295 usually appear as multi-charge ions, so expect a peak near 1684.9 rather than a single one at the full weight. A tested 5 mg + 5 mg blend runs $80–$150 per vial. The stack research covers why the two are paired.

Where to buy DSIP

Research supply only. The identity line should read CAS 62568-57-4, against a molecular mass of 848.82 g/mol. The mass-spec peak lands at 849.8. Expect $40–$80 for a 5 mg vial and $70–$130 for 10 mg. Below $30 per 5 mg deserves a question. Above $100 you are paying retail markup. One more tell: a vendor who says out loud that the brain target is unidentified is reading its own literature. The full guide covers what the modern studies did and did not reproduce.

Where to buy epithalon

Research supply only. The certificate should show CAS 307297-39-8, a molecular weight of about 390 g/mol, and the sequence written out as Ala-Glu-Asp-Gly. Mass spec should land at 391.2, within 0.3 Da. Expect $60–$100 for 10 mg, $100–$150 for 20 mg and $130–$170 for 50 mg. Vendor copy claiming proven human results is the red flag here, because the Russian trials behind those claims have never been independently replicated. The full guide sets out what those trials actually measured.

Where to buy glutathione

Three channels, and they are priced an order of magnitude apart. Research supply sells bulk powder at $30–$60 per gram. An IV clinic bills $150–$400 a session on $20–$60 of material. Two CAS numbers circulate for this compound and they are different molecules: 70-18-8 is reduced glutathione, and 27025-41-8 is the oxidized dimer. Reduced is the form the research uses, at 307.32 g/mol. Ship it freeze-dried and light-protected. The full guide separates the redox evidence from the skin-lightening claim.

Where to buy gonadorelin

Three routes, which is rare here. A research-supply vendor online, a compounding pharmacy if a prescriber writes for it, or fertility care delivered by pump. Gonadorelin is synthetic GnRH, a decapeptide with an approved diagnostic use behind it. The real sourcing risk is analog substitution. A related GnRH analog suppresses the axis instead of stimulating it. That is the opposite of what was intended. A purity figure tells you how clean the vial is, not which GnRH molecule is in it. The full guide explains why pulsed and steady delivery do opposite things.

Where to buy hexarelin

One route: research-supply vendors online. No pharmacy stocks it and there is no prescription for a doctor to write. At six amino acids it is cheap to make, so counterfeits are rare and identity is not the main worry. Degradation is. A short peptide can be genuine and still be spoiled, so ask how the vial was stored and shipped. Hexarelin is the most potent growth-hormone releaser in its class and the fastest to stop working. The full guide covers that trade-off and the newer cardiac work.

Where to buy IGF-1 LR3

Research and life-science reagent suppliers, and that is the only route. The prescribable IGF-1 product is a different molecule entirely. This one runs to 83 residues. That is long for a synthetic peptide, so quality varies far more than it does for short ones. Folding matters as much as sequence purity. A percentage cannot tell you whether the chain assembled into the right shape. The LR3 modification is what a cheap vial is likeliest to lack, so name it on the certificate. The full guide has the human safety picture, which is the thinnest in this field.

Where to buy KPV

Research supply online. Our verified set holds no CAS number for KPV, so ask for the mass and the sequence instead: 342.4 g/mol, and an identity line reading Lys-Pro-Val and nothing longer. The mass-spec peak should land at 343.4, within 0.5 Da. A longer fragment sold as KPV is the substitution this check catches. Expect $40–$80 for a 10 mg vial of lyophilized powder; above $100 is retail markup. The full guide and what the research reports cover the melanocortin pathway.

Where to buy NAD+

Research supply sells lyophilized powder at $75–$150 per 500 mg vial. An IV clinic bills $500–$1,500 a session. Only about $150 of that is material in a 1,000 mg infusion. The check that separates this order from a cheaper precursor is the CAS number. NAD+ itself is 53-84-9, at 663.43 g/mol, reading [M+H]⁺ 664.4. NMN is CAS 1094-61-7 at 334.22 g/mol and reads 335.2. Nicotinamide riboside is lighter again, at 255.23 g/mol. Three molecules, three prices, and the substitution is invisible on a label. The full guide compares the routes.

Where to buy PT-141

Two routes, because this one has an approved product behind it. The pharmacy version is Vyleesi, on a prescription, at about $300 a dose. A research vendor ships the reference compound as powder for $40–$80 per 10 mg. The certificate should carry CAS 189691-06-3. Mass spec should read [M+H]⁺ 1026.2, against a theoretical 1025.2 g/mol. Melanotan II sits at 1024.2 Da, one dalton away. A certificate showing purity and no mass cannot separate the two. The full guide covers the Vyleesi trials.

Where to buy selank

Research supply only. The certificate should spell out the seven-residue sequence with its N-acetylation. It should carry CAS 129954-34-3 and a molecular weight of 793.9 g/mol. Mass spec should read near 794.9, within half a dalton. Expect $40–$80 per 10 mg vial, $30–$55 for 5 mg and $70–$140 for 20 mg. Below $30 per 10 mg, doubt the acetylation step and the purification behind it. The full guide covers the Russian anxiety trials.

Where to buy semax

Research supply only, and this is the one identity trap worth reading twice. Two different molecules are sold under the name. CAS 80714-61-0 belongs to plain semax at 813.9 Da, not to the acetylated amide. Plain semax should read [M+H]⁺ 814.9 on the certificate. N-Acetyl Semax Amide is a separate molecule at 854.9 g/mol and reads 855.9. A certificate whose CAS and whose mass describe different molecules has told you nothing. Water content should be under 8%. Expect $40–$80 per 10 mg vial. The full guide has the stroke-protocol history.

Where to buy SS-31

Research supply for the reference compound. The prescription version, Forzinity, is orphan-drug priced at $300,000–$750,000 a patient year. The two are not alternatives to each other. A certificate should show HPLC purity at or above 98%. Mass spec should read [M+H]⁺ 640.8, against a theoretical 639.79 g/mol. Chiral HPLC should confirm the D-arginine. The likely substitution is ordinary tyrosine in place of Dmt, which lands near 612 Da. That 28-dalton gap is the two missing methyl groups. Research-grade material runs $80–$150 per 10 mg vial. The full guide covers the cardiolipin mechanism.

Where to buy TB-500

Research supply only, and the name covers two different molecules. One is full-length thymosin β4, a 43-amino-acid human peptide at about 4963 Da. The other is the synthetic seven-residue fragment Ac-LKKTETQ at 889.0 g/mol, which carries CAS 885340-08-9. Ask in writing which one is in the vial, because the price and the synthesis differ sharply. Expect $50–$120 per 5 mg vial of lyophilized powder. Below $40 per 5 mg, ask about purification. The full guide covers the actin-binding work.

Where to buy thymosin alpha-1

Two routes, split by country. In more than 30 countries a pharmacy fills it on prescription as Zadaxin or thymalfasin. It is not approved in the US. So a US buyer has one route: research supply, no prescription involved. The check is the N-terminal acetyl group. Substitution there gives a peptide that reads right on paper and is not the same molecule. Only a mass number separates the two, by 42 daltons. Approval elsewhere says nothing about what is inside an unregulated vial. The full guide explains the approval gap.

What about the compounding channel?

503A is the section of federal law that lets a pharmacist prepare a drug for one named patient. It works from approved active ingredients, so it reaches semaglutide and tesamorelin rather than BPC-157, and the FDA moved BPC-157 to its restricted category in 2023.

That picture is in motion. The FDA's Pharmacy Compounding Advisory Committee met on 23–24 July 2026 with BPC-157, KPV, TB-500 and MOTS-c on the agenda for the 503A bulks list. The outcome of those votes is not something we can confirm, so this page does not state one. An advisory vote is not rulemaking, and 503A listing concerns prescription compounding: it would not turn the research-supply channel into a pharmacy. The compounding history in full.

Frequently asked questions