We rate Synthesis Peptides 8.5/10. Its 102 public certificates all match exact issuer records, and 85 current product-and-strength rows have direct certificate controls. The store publishes clear US shipping terms, accepts major cards and PayPal, and offers verified 10% off with code PEPTIDEPRICES.
How the score breaks down
Synthesis Peptides scored across our four rubric factors — COA practices (40%), reputation, transparency, and operations (20% each).
COA practices 40%9/10
Reputation 20%7/10
Transparency 20%9.5/10
Operations 20%8/10
Weighted factor result: 8.5/10. The published score follows the weighted result after rounding.
8.5/10Quality rating
41Catalog
10%Reader discount
Evidence summary
Why Synthesis Peptides is rated 8.5/10
Our conclusion
Synthesis Peptides earns 8.5/10 with 102 issuer-verified public documents, 85 exact listing controls, clear US fulfillment terms, major-card and PayPal checkout, and verified 10% savings.
Its testing transparency is the standout strength. The main limitation is a shorter independent customer-review history than the archive depth would suggest.
Verification notes
What we reviewed, with the limits of that evidence kept explicit.
01
Strong multi-lab certificate coverage
Synthesis Peptides backs a broad catalog with 102 public certificates that match exact laboratory records: 77 Freedom Diagnostics files, 17 Kovera documents, 6 ILS certificates, and 2 Vanguard reports. Eighty-five current product-and-strength rows have direct controls. Five older Freedom files without an official record are excluded from public pages. The two Vanguard L-carnitine records are issuer-authentic but remain archive-only because Vanguard attributes the report IDs to Orbitrex Peptides. Public storefront labels remain SYN-1SG, SYN-2TZ, and SYN-3RT.
The exact-domain independent review history is still developing, but the multi-lab testing record is unusually deep for this market. The available evidence supports a 7/10 reputation factor without treating laboratory records as customer reviews.
03
Shipping and checkout
The store ships inside the United States only. Orders placed before 12pm PST ship the same business day by USPS or UPS, with typical delivery in 1–3 business days after dispatch. Shipping is free over $250. All sales are final. Defective or incorrect items require notice within 72 hours of delivery. The FAQ lists Visa, Mastercard, Amex, Discover, and PayPal. Code PEPTIDEPRICES gives customers 10% off.
04
Company identity and rating
The storefront publishes 3009 Hawksdale Dr, Unit #153, Las Vegas, NV 89134, and identifies the business as veteran-owned. The public certificate archive, support details, policies, and checkout information support a 9.5/10 transparency factor. Factor scores are COA 9, reputation 7, transparency 9.5, and operations 8, for an 8.5/10 overall rating.
Orders placed before 12pm PST ship the same business day. The store uses USPS and UPS and states 1–3 business-day delivery after dispatch. Shipping is free over $250. All sales are final. Defective or incorrect items require notice within 72 hours of delivery.
Decision guide
Synthesis Peptides — strengths and watch-outs
Strengths
All 102 public certificates match exact laboratory records
Eighty-five current product-and-strength rows have direct certificate controls
The archive spans Freedom Diagnostics, Kovera Labs, ILS Laboratories, and Vanguard
Major cards and PayPal are listed, with free shipping over $250
Code PEPTIDEPRICES gives customers 10% off
Watch-outs
Five older Freedom files without an official record are held off public pages
Cartalax, Cortagen, tablets, and some strengths have no exact current comparison match
The published Las Vegas line is a unit mailbox address
Two Vanguard L-carnitine records stay archive-only because the official catalog attributes them to Orbitrex Peptides
PeptidePrices community
Reviews from our readers
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Direct answers
Synthesis Peptides frequently asked questions
Is Synthesis Peptides legit?
We rate Synthesis Peptides 8.5/10. All 102 public certificates match exact laboratory records, and 85 current product-and-strength rows have direct controls.
Is synthesispeptides.co legit? Are Synthesis Peptides reviews trustworthy?
synthesispeptides.co is the official website of Synthesis Peptides. Synthesis Peptides scores 8.5/10 in our published evidence rubric (Trusted). See our independent analysis above.
Does Synthesis Peptides publish COAs?
Yes. PeptidePrices publishes 102 issuer-verified documents from Freedom Diagnostics, Kovera Labs, ILS Laboratories, and Vanguard. Five older Freedom files without official records are held off public pages.
Is there a Synthesis Peptides discount code?
Yes — use code PEPTIDEPRICES for the current PeptidePrices partner discount. Open the vendor through the referral link, then enter the code separately at checkout and confirm the discount before payment.
Where is Synthesis Peptides based?
Synthesis Peptides operates out of Las Vegas, NV (published address 3009 Hawksdale Dr, Unit #153).
How does Synthesis Peptides compare to other peptide vendors?
See our /vendors page for the full ranked list. We use the same rubric for every vendor on the site, so direct comparison is straightforward.
What is the Synthesis Peptides coupon code?
Use verified code PEPTIDEPRICES for 10% off.
Where is Synthesis Peptides located?
The storefront publishes 3009 Hawksdale Dr, Unit #153, Las Vegas, NV 89134, and identifies the business as veteran-owned. It ships inside the United States only.
How we rate vendors
Our quality scores are based on a weighted rubric: 40% COA practices (named third-party lab, batch linkage, public availability), 20% community reputation, 20% transparency, and 20% operations. We are independently owned; affiliate status is not a scoring factor.
PeptidePrices is independently owned and participates in Synthesis Peptides's affiliate program. We may be paid for qualifying purchases through our links. Synthesis Peptides cannot edit or approve this review, and the relationship does not add points to its score.
