Peptide Referee

Synthesis Peptides review: is it legit?

Live Transparency score 63/100 Checked Oct 15, 2026. Visit synthesispeptides.co

Our findings in brief

In short: Synthesis Peptides scores 63/100, higher than 74% of the 192 active vendors we track. It's #36 on our best peptide vendors list.

We haven't lab-tested anything from Synthesis Peptides, so this covers public evidence only, not product quality. As of Oct 15, 2026:

What checks out

What's missing or unverified

Across 5 peptides that at least three vendors sell, its best prices are typically 21% above the median (1 of 5 below). Compare its prices.

At a glance

Website
synthesispeptides.co
Status
Live
Domain registered
Jul 13, 2026 (3 months ago)
Registrar
Porkbun
Domain expires
Jul 13, 2027
First archived
Aug 28, 2026
Shop platform
Custom
Ships to (stated)
US
Payment (stated)
Card, PayPal
COAs
Batch COAs public
Research-use disclaimer
Yes
Traffic rank (Tranco)
Outside the top 1 million

Transparency checks

Six checks of public information, worth 100 points. The score measures openness, not product quality. How we score.

CheckWhat we foundPointsEvidence
Domain age Registered Jul 13, 2026 (3 months old) 0/20 Registry record
Public certificates of analysis Batch-specific COAs are public 25/25 COA page
Independent lab named on COAs No independent lab named 0/10 —
Business identity Address published; no company name found 8/15 Address
Shipping, refund and terms pages All three found 15/15 Shipping · Terms
Card or PayPal payment (buyer protection) Site lists card and PayPal 15/15 Card, PayPal

Total: 63/100. All six checks completed.

Synthesis Peptides prices compared

The lowest price per milligram at Synthesis Peptides for each peptide, against the median listing across all vendors we track. Rank 1 = cheapest vendor for that peptide.

Peptide Synthesis Peptides $/mg Median $/mg vs median Price rank
GHK-Cu $0.740/mg $0.590/mg +25% 64th of 91
BPC-157 $5.00/mg $5.28/mg −5% 43rd of 82
Tesamorelin $8.00/mg $6.62/mg +21% 60th of 78
TB-500 $7.50/mg $6.17/mg +21% 55th of 80
Cagrilintide $12.60/mg $8.90/mg +42% 45th of 61

Price index: 1.21 (1.00 = market median; lower is cheaper), across 5 peptides sold by 3+ vendors.

All Synthesis Peptides listings (5)

Peptide Product Size Price $/mg vs median Stock Vendor's page
BPC-157 BPC-157 10 mg $50 $5.00/mg −5% In stock View
Cagrilintide Cagrilintide (Amylin Analogue) 5 mg $63 $12.60/mg +42% Out of stock View
GHK-Cu GHK-Cu 50 mg $37 $0.740/mg +25% In stock View
TB-500 TB-500 10 mg $75 $7.50/mg +21% In stock View
Tesamorelin Tesamorelin 10 mg $80 $8.00/mg +21% In stock View

Prices come from each vendor's public product feed and were last fetched Oct 15, 2026. They exclude shipping and discounts. $/mg uses the labeled amount, not measured content. How we compare prices.

Alternatives to Synthesis Peptides

Live vendors selling the same peptides as Synthesis Peptides, ranked by transparency score. Payments from vendors never affect this order.

# Vendor Status Transparency Domain age COAs Ships to Prices tracked Lab tests
1 Peptidology Live 90/100 22 months Batch COAs public US 3 —
2 Pure Peptide Labs Live 90/100 12 months Batch COAs public US, worldwide 44 —
3 Eros Peptides Live 87/100 3.4 years Generic COAs only US 14 —
4 Nationwide Peptides Live 85/100 11 months Batch COAs public US 38 —
5 Go Alpha Labs Live 83/100 17 months Batch COAs public US 47 —

Is something wrong?

If you run Synthesis Peptides, or you have evidence that something here is out of date, email [email protected] with a link to the evidence. We re-check within five business days and log every change on our corrections page.

Evidence we used (19)