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
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Review summary
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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 am fairly new to peptides and since I have found Northline Labs it has made the process and the cost so much easier. Their customer service is amazing, they email you back right away, they are helpf... See more
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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
373 reviews
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Replied to 100% of negative reviews
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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
11 June 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.
1 May 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.
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
11 June 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.
2 June 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
3 June 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!
1 June 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.
1 May 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.
10 June 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!
4 June 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.
10 June 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.
24 April 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
2 June 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.
Great service and prices
First of all the website is user friendly which is a plus. The BOGO deals are great because this stuff is expensive. The shipments go out fast and ha not had any problems. Overall I am pleased with the service and prices will continue to buy.
25 May 2026
Unprompted review
Reply from Northline Labs
Thank you, Everett! Glad the site's easy to use and the BOGO deals are landing for you. Fast, problem-free shipping at fair prices is what we're after. We appreciate you and look forward to your next order!
Fast delivery easy checkout easy site…
Fast delivery easy checkout easy site to navigate amazing company
20 May 2026
Unprompted review
Reply from Northline Labs
Thank you, Jesse! Fast delivery, easy checkout, and a site that's simple to navigate is exactly what we want. We appreciate the kind words!
Great company to work with
Great company to work with, easy ordering, fast delivery arrived within 3 days will use again, keep up the good work.
10 June 2026
Unprompted review
Reply from Northline Labs
Thank you, Mandy! Easy ordering and 3-day delivery — exactly what we aim for. We'll keep it up, and we appreciate you coming back!
Quick shipping
Quick shipping. Pricy cane in professional looking goal. Looks like we got just what we ordered
1 June 2026
Unprompted review
Reply from Northline Labs
Thank you, Kristy! Quick shipping and professional packaging, exactly as ordered — that's what we like to hear. Appreciate you!
Great customer service
When I received my first order with this company, it was incorrect. However, they rectified it almost immediately. Since then, all my orders have come quickly and correct.
27 May 2026
Unprompted review
Reply from Northline Labs
Thank you! We're glad we could fix that first order right away — and even happier everything's been quick and correct since. That's exactly how we want to show up. We appreciate you!
The shipping is quick
The shipping is quick. I had a question with my order and they responded quickly to my email. I’ve placed 2 orders and getting ready to place my 3rd.
12 May 2026
Unprompted review
Reply from Northline Labs
Thank you, Miranda! Quick shipping and fast support — glad we could help with your question. Three orders in, we're grateful to have you and here's to many more!
I am fairly new to peptides and since I…
I am fairly new to peptides and since I have found Northline Labs it has made the process and the cost so much easier. Their customer service is amazing, they email you back right away, they are helpful and curious. I have referred 3 friends and they all love it too!!
15 May 2026
Unprompted review
Reply from Northline Labs
Thank you, Tianna! Making the process and cost easier, plus quick and helpful email support, is exactly what we go for — and referring 3 friends means the world to us. We appreciate you!
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