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
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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
Asks customers to review
This company invites their customers to review, whether positive or negative
Replied to 100% of negative reviews
Typically replies within 1 month
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I was very happy with my order.The…
I was very happy with my order.The shipping was fast and delivered with care.will definitely be ordering again soon.
May 25, 2026
Unprompted review
Reply from Northline Labs
Thank you, Loreley! Fast shipping delivered with care — exactly what we aim for. We'll be here when you're ready to order again!
Northline Labs has been my go to for…
Northline Labs has been my go to for peptides for some time now. Competitive pricing, quality products, and fast shipping.
May 15, 2026
Unprompted review
Reply from Northline Labs
Thank you, Thomas! Being your go-to means a lot — competitive pricing, quality, and fast shipping are exactly what we work to keep up. We appreciate your loyalty!
Ordering made easy
Ordering made easy. I appreciate that they have the lab utilized on their cite. Delivery was very prompt and the products have helped me tremendously.
May 8, 2026
Unprompted review
Reply from Northline Labs
Thank you, Carrie! Easy ordering, prompt delivery, and transparent lab testing right on the site — that's exactly what we want to deliver. We appreciate you!
Best company I’ve found by far
Best company I’ve found by far! All compounds have been amazing!
May 27, 2026
Unprompted review
Reply from Northline Labs
Thank you so much! “Best company by far” is incredible to hear — we're grateful for your support and we're not slowing down. Appreciate you!
Great products
Great stuff! I’ve noticed a difference in my body and haven’t had any issues!
April 8, 2026
Unprompted review
Reply from Northline Labs
Thank you! So glad the experience and the ordering process have been smooth for you. We really appreciate the support — see you next order!
Fast shipping with excellent customer service
I have ordered 3 different Products from Northine Labs. All 3 were shipped the same day I ordered them. Communication from their email system was excellent. They are # 1 on my list for purchasing peptides for research.
June 8, 2026
Unprompted review
Reply from Northline Labs
Thanks Patrick! Three orders shipped same-day with clear communication — that's exactly the experience we want to deliver. Honored to be #1 on your list. Appreciate you!
Product review
Northline has very fast shipping. They are typically running a bogo sale. All of their products are third party tested. Great company to work with.
June 9, 2026
Unprompted review
Reply from Northline Labs
Thank you! Fast shipping, third-party tested products, and our regular BOGO — you summed us up perfectly. Great to work with you too!
Happy Customer!
Remarkable Results! Life Changing! Products as described. Quick Shipping
April 15, 2026
Unprompted review
Reply from Northline Labs
Thank you so much! Products as described and quick shipping — exactly what we aim for on every order. We're grateful for the support!
Excellent Experience with Northline Labs
While my interaction with Northline Labs was primarily remote, I had a great experience. The process was smooth, communication was clear, and everything was handled professionally from start to finish. I was especially impressed by how quickly my order was delivered—it arrived faster than expected, which was greatly appreciated. Overall, the entire experience was easy, efficient, and hassle-free. I would definitely recommend Northline Labs to anyone looking for reliable service and fast delivery.
May 24, 2026
Unprompted review
Reply from Northline Labs
Thank you, Lashell! Smooth, clear, and faster than expected from start to finish — that's the experience we work hard for. We'd love to have you back, and thanks so much for the recommendation!
Great products and very speedy service!!
Great products and very speedy service! Will definitely be placing more future orders!!!
May 18, 2026
Unprompted review
Reply from Northline Labs
Thank you, Nancy! Speedy service and happy customers — that's the goal. We can't wait for those future orders. Appreciate you!
Fast ✅ quality products ✅ great…
Fast ✅ quality products ✅ great customer service ✅
March 23, 2026
Unprompted review
Reply from Northline Labs
Thank you, Sparky! Fast, quality products, and great service — you nailed exactly what we go for. Appreciate you!
Quick delivery and effective peptides
June 9, 2026
Unprompted review
Reply from Northline Labs
Thank you, Marcy! Quick delivery is something we take a lot of pride in. We really appreciate you taking the time to leave a review!
Great product
Great product, great results from a trusted source. Well worth the money in your fitness journey.
May 1, 2026
Unprompted review
Reply from Northline Labs
Thank you, Janice! “Trusted source” and worth it — that genuinely means a lot to us. We appreciate your support!
Got my GLP-3 shortly after ordering
Got my GLP-3 shortly after ordering. I’m early in the process but so far it seems great. No complaints at all and everything seems to be as expected so far!
June 9, 2026
Unprompted review
Reply from Northline Labs
Thank you! Quick delivery and no complaints — exactly what we like to hear. We're here whenever you need us. Appreciate you!
Surprisingly quick delivery window
Surprisingly quick delivery window. Great quality, packaged great.
Had someone reach out to make sure everything had went well during process. Will be ordering again.
June 1, 2026
Unprompted review
Reply from Northline Labs
Thank you! Quick delivery, solid packaging, and a check-in to make sure all went well — that's the experience we want every time. See you on the next order!
Love that these come from MN
Love that these come from MN. Came well packaged. Affordable while remaining pure. Don’t forget your BAC water.
May 20, 2026
Unprompted review
Reply from Northline Labs
Thank you, Lydia! Proud to be Minnesota-based, and glad the packaging and value landed right. Great shout on the BAC water too. Appreciate you!
Great service and peptide seem to be…
Great service and peptide seem to be working 😁 for me
June 9, 2026
Unprompted review
Reply from Northline Labs
Thank you, Eusebio! Great service is something we really focus on — glad it showed. We appreciate you taking the time to leave a review!
The website is straightforward and easy…
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 tracking number pretty quickly. All in all Northline Labs is great and I highly recommend them!
June 4, 2026
Unprompted review
Reply from Northline Labs
Thank you, Ray! Easy to navigate, fair prices, proactive support, and quick tracking — that's the full experience we're going for. Thanks so much for the recommendation!
Great results from Reta
Great results from Reta. Good pricing. Quick delivery.
May 11, 2026
Unprompted review
Reply from Northline Labs
Thank you, Kelli! Good pricing and quick delivery are exactly what we aim for. We really appreciate you taking the time to review!
Easy to order with no hassle and…
Easy to order with no hassle and received my items faster than I thought. Will definitely use Northern Labs again.
May 28, 2026
Unprompted review
Reply from Northline Labs
Thank you, Carlos! No hassle and faster than expected — that's the goal. We'll be here when you're ready to order again. Appreciate you!
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