Absolutely loving my results from Reta, MOTC, and NAD+ and I am even doing lower doses and many online BROS recommend. I did a lot of research before hand for quality 3rd party lab testing with great... See more
Company replied
While we don't verify specific claims because reviewers' opinions are their own, we may label reviews as "Verified" when we can confirm a business interaction took place. Read more
To protect platform integrity, every review on our platform—verified or not—is screened by our 24/7 automated software. This technology is designed to identify and remove content that breaches our guidelines, including reviews that are not based on a genuine experience. We recognise we may not catch everything, and you can flag anything you think we may have missed. Read more
Review summary
Created with AI, based on recent reviews
What people talk about most
Reviews shaping this summary
The website is straightforward and easy to navigate. The prices are better than most other sites. I got a text message asking if I had any questions or concerns. Shipping was quick and I received a... See more
Company replied
I started with Northline Labs a few months ago with one peptide. I was impressed with their customer care and their speed with getting me my product. Also their quality is like no other I’ve had befor... See more
Company replied
I couldn’t recommend Northline labs’s more. They are the best in the game, in my opinion. To list a few reasons—they offer high quality peptides (third party tested), amazing customer service, in-dept... See more
Company replied
Company details
Written by the company
Northline Labs is an independent United States supplier of research-grade peptides and bacteriostatic water. We work with researchers, laboratory professionals, and biotech operators who need consistent quality and predictable supply. Every batch we ship is third-party verified at 99%+ purity. The Certificate of Analysis for each lot is published on the corresponding product page before the order moves — no waiting, no requesting. Weekday orders typically ship same-day via UPS, and we run a standing buy-one-get-one-50%-off offer across the catalog. We answer customer emails in hours rather than days, and we read every reply. Lot quality, transparency, and responsive support are the three things we work hardest to never miss — and the reason most of our customers come back.
Contact info
United States
- northlinelabs.org
4.7
Excellent
376 reviews
Asks customers to review
This company invites their customers to review, whether positive or negative
Replied to 90% of negative reviews
Typically replies within 1 month
How this company uses Trustpilot
See how their reviews and ratings are sourced, scored, and moderated.
Everything was easy
Everything was easy, honest, and simple! Delivery was fast! Will be a regular customer!
June 4, 2026
Unprompted review
Reply from Northline Labs
Thank you, Molly! Easy, honest, and simple with fast delivery is exactly what we want every order to feel like. We're glad to have you as a regular!
I think the value of express delivery…
I think the value of express delivery could be better, and it could arrive faster.
June 12, 2026
Unprompted review
Reply from Northline Labs
Thanks for the honest feedback, Fabiana. We hear you on express delivery value and speed — it's something we're actively working to improve. We appreciate you taking the time.
Quick turnaround
I received my order in 3 business days and it was as advertised.
May 25, 2026
Unprompted review
Reply from Northline Labs
Thank you, Brent! Three business days and exactly as advertised is the experience we want every time. We appreciate you.
Reply from Northline Labs
Thank you, Paul! Easy ordering, great pricing, and quick delivery is what we're here for. We appreciate you.
Reply from Northline Labs
Thank you, Steve! Fast shipping, solid packaging, and quality all around is exactly what we strive for. We appreciate you!
Been using them for months
Been using them for months. Good product and fast shipping.
June 12, 2026
Unprompted review
Reply from Northline Labs
Thank you, Victoria — months of loyalty means a lot to us. A good product and fast shipping every time is the goal. We appreciate you!
Reply from Northline Labs
Thank you, Kandace! Good service and an even better product is the bar we hold ourselves to. We appreciate you.
So I've been on the glp-3 for 3 weeks
So I've been on the glp-3 from Northline Labs for about 3 weeks now and I love the results dropped about 10 lbs . I have a really bad sweet tooth and it basically silenced the cravings excellent product I will be ordering again
June 11, 2026
Unprompted review
Reply from Northline Labs
Thank you for the kind words and the 5 stars — we truly appreciate you, and we're glad you'll be ordering again!
Package took a little longer to receive…
Package took a little longer to receive so I missed some doses, so far everything seems to be working. Klow has helped with my inflammation and it also helps me sleep very well. Reta has yet to kick in, I have 20 mg so my next order will be 30mg, I’m hoping to loose some weight but also have more energy & recover faster from Hiking.
May 1, 2026
Unprompted review
Reply from Northline Labs
Thanks for the honest feedback, Rachel. Sorry the package took a little longer this time — we're always working to keep delivery quick, and we appreciate your patience and the 4 stars.
Good quality
Good quality, excellent customer service and fast shipping
June 1, 2026
Unprompted review
Reply from Northline Labs
Thank you, Nicolette! Good quality, excellent service, and fast shipping is the standard we hold. We appreciate you.
I am just getting started with…
I am just getting started with peptides, and Northline has been so helpful. They are quick to answer any questions I may have via email, and shipping has always been fast. I appreciate everything about Northline. The quality of the peptides has been great!
Kristy T
June 11, 2026
Unprompted review
Reply from Northline Labs
Thank you so much, Kristy! We're glad the team has been helpful and responsive over email, and that shipping's been fast. We're grateful to have you with us as you get started!
Very positive
Very positive, highly recommend this site. Product are quality. I am using reta and recommend highly.
June 2, 2026
Unprompted review
Reply from Northline Labs
Thank you, Andrea! We really appreciate the high recommendation and the kind words about quality. Grateful to have you with us.
Shipped quickly
Very impressed with how quick it was shipped. As soon as I placed my order within the same day it was on the way. Packaged great and no damages. Ordered twice and will again. Ty
June 3, 2026
Unprompted review
Reply from Northline Labs
Thank you, Christie! Quick shipping, solid packaging, and no damage on arrival is exactly what we aim for. We appreciate you.
Northline is very efficient and sells a…
Northline is very efficient and sells a great product. They are very responsive!
June 1, 2026
Unprompted review
Reply from Northline Labs
Thank you, Christopher! Efficient, responsive, and a great product is exactly what we strive for. We appreciate you.
Review of Delivered Order
After researching information on the website, I placed an order for the GLP3. The product was delivered within the time frame I was provided and I am very satisfied with the results thus far.
May 1, 2026
Unprompted review
Reply from Northline Labs
Thank you, Rebecca! We're glad your research led you to us, and that delivery landed right within the time frame we quoted. We appreciate you.
The only company I trust for peptides
I’ve been ordering various peptides from Northline for four months and the experience has been great. The products are effective, tested for purity, and shipping is fast.
June 10, 2026
Unprompted review
Reply from Northline Labs
Thank you for trusting us with your peptide orders these past few months — that means a lot. We're proud of our purity testing and fast shipping, and grateful to have you with us.
Great Products and Customer Service! Multiple orders.
Great Products and Customer Service!
June 4, 2026
Unprompted review
Reply from Northline Labs
Thank you, Bryan! Great products and great service across multiple orders is exactly what we aim for. We appreciate your repeat business!
I order and it shipped the same day
I order and it shipped the same day. Got the product fast. So far so good on the quality. I like the COA’s for each batch are available for transparency.
June 10, 2026
Unprompted review
Reply from Northline Labs
Thank you, Christopher! Same-day shipping and a per-batch COA for transparency are things we're proud of. We appreciate you.
fast delivery, great product
I’ve ordered from Northline Labs a few times now and have been using Reta, NAD+, and GHK-Cu for about 4 months. Delivery has always been quick, the process is simple, and I haven’t had any issues. Products arrived as expected and overall it’s been a very smooth experience. Definitely happy with my orders so far.
April 24, 2026
Unprompted review
Reply from Northline Labs
Thank you, Eva! A few months of quick delivery, a simple process, and no issues is exactly the smooth experience we want for every order. We appreciate you!
Been using Northline for about half a…
Been using Northline for about half a year now.. Go product and customer service will be continuing to use them
June 2, 2026
Unprompted review
Reply from Northline Labs
Thank you, Johnny! Half a year with us means a lot — we're glad the product and customer service have kept you coming back. We appreciate you and look forward to your next order.
The Trustpilot Experience
Anyone can write a Trustpilot review. People who write reviews have ownership to edit or delete them at any time, and they’ll be displayed as long as an account is active.
Companies can ask for reviews via automatic invitations. Labeled Verified, they’re about genuine experiences.
Learn more about other kinds of reviews.
We use dedicated people and clever technology to safeguard our platform. Find out how we combat fake reviews.
Learn about Trustpilot’s review process.
Here are 8 tips for writing great reviews.
Verification can help ensure real people are writing the reviews you read on Trustpilot.
Offering incentives for reviews or asking for them selectively can bias the TrustScore, which goes against our guidelines.