Tested, lot by lot
Every lot is checked by an independent laboratory, and the certificate of analysis for your lot comes with your order.
Synthos Research Peptides
The peptides everyone's talking about. Lab-tested.
Reta, BPC-157, GHK-Cu, NAD+ and 27 more research compounds. Every lot is analysed by an independent lab and ships with its certificate, and you pay only after a real person has confirmed your order.
31research compounds in stock
€0to pay today. We call you first.
Independent lab test, every lot
Pay after a confirmation call
Ships from inside the EU
Real people, not bots
Why researchers choose Synthos
You've done your reading. We've done the testing.
A real person first
Leave your number and a Synthos representative confirms everything with you. You pay only once it's all clear: €0 online.
Fast and discreet, from the EU
Tracked shipping from inside the EU in a plain box, with no customs or import fees inside the EU.
Explained, not hyped
Every compound has its own research review, with a source for every number.
Open the Research Library →The whole idea is simple: you focus on your research, we take care of everything else.
Quality
Every lot gets an ID check
Before a lot is released for sale, an independent laboratory analyses it. The certificate of analysis travels with your order, so you can check the vial for yourself.
Identity
Is it the right compound?The lab confirms the molecule in the vial is the one on the label.
Purity
How clean is it?How much of the content is the peptide itself, and how much is anything else.
Amount
Is the dose really there?A 10 mg vial should hold 10 mg. The analysis measures what is actually inside.
Lot number
Can you trace it?Every vial carries its lot number, which links it to its own certificate.
Want to see the certificate before you pay? Ask your representative on the call.
Shop by research area
View all 31Find your research area
Weight managementMetabolic and appetite-signalling peptides.6 compounds →Recovery & repairPeptides studied in tissue repair and inflammation models.5 compounds →Skin & hairCopper peptides and blends studied in skin and hair research.3 compounds →Longevity & cellularMitochondrial, telomere and cellular-ageing research compounds.6 compounds →HormonalPeptides studied in endocrine and hormonal signalling.7 compounds →CognitiveNeuropeptides studied in focus, stress and memory models.2 compounds →Lab suppliesReconstitution and handling supplies.2 compounds →
Most ordered
Shop allBestsellers
Weight managementReta 40 mg pen
Triple GLP-1 / GIP / glucagon receptor agonist in a ready-to-use pre-filled pen.
€279
Weight managementReta 10 mg
Triple GLP-1 / GIP / glucagon receptor agonist, 10 mg lyophilised peptide vial.
€89
Recovery & repairTB-500 10 mg
Synthetic fragment of thymosin beta-4 studied in repair and mobility.
€90
Longevity & cellularNAD+ 1000 mg
Nicotinamide adenine dinucleotide for cellular-energy research.
€105
HormonalCJC-1295 + Ipamorelin 10 mg
GHRH analogue combined with a selective ghrelin-receptor agonist.
€90
Research stacks
Compounds that are studied together
Ready-made combinations from the published research. Add the whole stack in one tap; ask about multi-vial pricing on your call.
Recovery stack
The two most-studied repair peptides, side by side.
€138
Mitochondrial stack
Cellular energy and mitochondrial-efficiency research.
- NAD+ 1000 mg€105
- MOTS-c 10 mg€65
- SS-31 10 mg€110
€280
Skin & collagen stack
Copper peptide plus an anti-inflammatory tripeptide.
- GHK-Cu 50 mg€65
- KPV 10 mg€65
€130
Focus stack
Two neuropeptides studied in attention and stress models.
- Semax 10 mg€65
- Selank 10 mg€60
€125
How ordering works
Simple, and nothing to pay online
- 1
Choose
Add compounds or a ready-made stack to your cart. No account, no card.
- 2
Leave your number
Name and phone at checkout. Takes about 30 seconds.
- 3
A real person calls
Within 24 hours we confirm products, quantities, shipping and the lot certificate.
- 4
Pay & receive
Pay by card, transfer or a local method. Your tracked box ships from the EU in 1–2 days.
Featured
Reta 40 mg, ready to use.
Retatrutide, the triple GLP-1 / GIP / glucagon agonist, in a pre-filled pen with 12 needles in a branded box. No mixing, no reconstitution. In a 48-week phase 2 trial (NEJM, 2023) the highest dose averaged a 24.2% reduction in body weight.
Why Synthos
Not your typical peptide vendor
 | Typical online vendor | |
|---|---|---|
| Pay only after a human confirms your order | ✓ | ✕ |
| Certificate of analysis for your exact lot | ✓ | ✕ |
| Ships from inside the EU (no customs in the EU) | ✓ | ✕ |
| Real person on the phone or WhatsApp | ✓ | ✕ |
| Plain, discreet, tracked packaging | ✓ | ✓ |
| Crypto-only or prepayment to a stranger | ✕ | ✓ |
Research Library
Open the Research LibraryWe don't just sell it. We explain it.
34 research reviews with a source for every number, and an honest evidence rating for every compound.
Retatrutide
Weight management
Retatrutide: what the triple-hormone trials actually show
One molecule, three hormone receptors and a phase 3 programme of more than 5,800 people. Here is what the retatrutide data say about weight, liver fat and side effects, and what they still cannot tell us.
BPC-157
Recovery & repair
BPC-157: what three decades of research actually show
A 15-amino-acid fragment of a stomach protein became one of the most talked-about repair peptides. Here is what the evidence says, and what it doesn't.
GHK-Cu
Skin & hair
GHK-Cu: what fifty years of copper-peptide research actually show
A three-amino-acid fragment of human blood went from a liver-cell experiment in 1973 to the ingredient list of countless skin creams. Here is how strong the evidence is, and who produced most of it.
Questions
Frequently asked
Can't find your answer? A real person replies within one working day.
How does ordering work?
Add products to your cart and leave your name and phone number at checkout. Nothing is charged online. A Synthos representative calls or messages you within 24 hours to confirm the order, and you pay once you're happy with it.
How can I pay?
Visa or Mastercard, bank transfer, and local methods such as MB WAY and Multibanco in Portugal. Your representative sends the payment details after the confirmation call.
Where do you ship, and how long does it take?
We ship worldwide from inside the European Union, always with tracking. EU orders have no customs or import fees and usually arrive in 2–5 working days. Outside the EU, delivery usually takes 5–12 working days, and any local import duties depend on your country; your representative will confirm this on the call.
Is the package discreet?
Yes. Orders go out in a plain box with no product names on the outside.
How do I know what's in the vial?
Every lot is tested by an independent laboratory, and the certificate of analysis for your lot comes with your order. Ask your representative if you'd like to see it before you pay.
Are these products for human use?
No. Synthos products are sold for laboratory research only. They are not medicines and are not approved by the EMA, FDA or any other regulator for human use.
Start your research with confidence.
Tested lots, EU shipping and a real person on the phone before you pay a cent.