Test Your Peptide For Free

Send us your peptide sample and get an independent HPLC lab test — identity, purity, and fill weight. No cost. Optional paid add-ons available.

HPLC + LC-MS 5-7 day results 100% confidential
Get My Free Test

Northline Labs

Third-party tested research peptides with full transparency

80
P-Score
Ubicación
USA
P-Score
80
Productos
40

Our Rating

Editorial Score
8.0 / 10
P-Score
80
COA Quality
8.5
Pricing
7.5
Shipping Speed
8.0
Customer Service
8.0
Transparency
8.0

Embed This Rating

Are you the owner of Northline Labs? Add your PepsReview rating badge to your website in under 2 minutes. Free, no signup required.

PepsReview Score
80 /100
Northline Labs
Live badge preview

About Northline Labs

Research peptide supplier emphasizing third-party testing and COA transparency. Offers GLP-1 receptor agonists including semaglutide, tirzepatide, and retatrutide with independent lab verification.

Third-party COA GLP-1 specialist Full lab reports USA-based

Score Breakdown

8.0
Overall Score
8.5
Quality
7.5
Price
8.0
Shipping
8.0
Service
8.0
Transparency

Pros & Cons

Pros

  • Independent third-party testing (not in-house)
  • Full lab reports published with testing facility name
  • Strong transparency and verification focus
  • GLP-1 catalog includes retatrutide
  • Responsive customer service

Cons

  • Very new company with limited reputation
  • Catalog still small (~30-40 peptides)
  • .org TLD unusual for commercial vendor
  • Shipping can be slow during restock periods
  • No bulk or loyalty discounts

Reseñas

Complete COA, higher price 2026-09-29

Northline Labs ships a batch-matched COA with the order and the certificate names the external lab that ran the analysis. Shipping was fast (3 days). My only complaint is the price — they sit at the higher end of the range. If documentation completeness is your priority, they're solid; I'd still compare a few suppliers first.

Best supplier I've used so far 2026-09-21

Ordered from Northline Labs a couple of times. Both orders shipped quickly and the product documentation was consistent. Their COA comes from a third-party lab, which is the part worth verifying, and the certificate number matched each vial. Prices are fair for the documentation standard. This entry records a supplier-service and documentation experience. It reports no outcome and names no amount. PepsReview does not host reports of personal use of research compounds, and nothing here is a recommendation to use any product.

Best supplier I've used so far 2026-09-17

Ordered from Northline Labs a couple of times. Both orders shipped quickly and the product documentation was consistent. Their COA comes from a third-party lab, which is the part worth verifying, and the certificate number matched each vial. Prices are fair for the documentation standard. This entry records a supplier-service and documentation experience. It reports no outcome and names no amount. PepsReview does not host reports of personal use of research compounds, and nothing here is a recommendation to use any product.

Write a Review

Share your experience with Northline Labs. Log in to write a review.

Log in to Review