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
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 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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So far so good
So far so good! Fast shipping with tracking updates throughout the process.
May 28, 2026
Unprompted review
Reply from Northline Labs
Thank you, Mikki! Fast shipping with tracking updates the whole way — that's exactly the experience we want. Glad it's off to a great start, and we appreciate you!
Product is Effective
Product is Effective, purchase is transparent and easy
June 9, 2026
Unprompted review
Reply from Northline Labs
Thank you! We work hard to keep the purchase transparent and easy — glad that came through. We appreciate you!
Satisfied
I have now ordered from Northline a few times and my order has always arrived quickly and with accuracy. I will continue to give my business to them.
March 9, 2026
Unprompted review
Reply from Northline Labs
Thank you, April! Quick and accurate on every order — that's exactly what we aim for. We're grateful for your continued business!
Great company with great products,,I…
Great company with great products,,I received my product in super fast time
December 27, 2025
Unprompted review
Reply from Northline Labs
Thank you, James! Great products and super-fast shipping — exactly what we strive for. We appreciate you!
Easy to order
Easy to order. They sent a follow up email right away with my tracking number. It did not arrive on its original date stated but when I emailed the company they relied within an hour with things get delayed. Let's wait until monday and we will go from there. They were right and it came the within the next 2 days. It is literally just the peptide with o instructions so prepare for that. I would order from thos company again though.
June 5, 2026
Unprompted review
Reply from Northline Labs
Thank you, Jennifer! Glad our team jumped on your email within the hour and got everything sorted — responsive support is a big deal to us. We appreciate you, and we'll see you on the next order!
So far great experience
So far great experience. Fast shipping and great results.
June 4, 2026
Unprompted review
Reply from Northline Labs
Thank you, Amanda! Fast shipping and a great experience so far — that's exactly what we want to hear. We appreciate you!
great product and quick delivery on…
great product and quick delivery on time and it’s top batch service seriously.
June 9, 2026
Unprompted review
Reply from Northline Labs
Thank you, Ahmed! Quick, on-time delivery and top-notch service — we appreciate the kind words and the support!
I’m pleased with the progress I’ve…
I’m pleased with the progress I’ve made. Easy to order and very fast delivery. Prices are decent.
June 9, 2026
Unprompted review
Reply from Northline Labs
Thank you! Easy ordering, very fast delivery, and fair prices — exactly what we aim for. We appreciate you!
Excellent products!
These peptides work better than I expected. Currently taking Reta and my appetite is non existent!
May 11, 2026
Unprompted review
Reply from Northline Labs
Thank you so much for the kind words and for choosing Northline — we're grateful for your support!
I've had good results with northline…
I've had good results with northline products and will continue to use them. Prices are reasonable and shipping is quick.
Judy W
June 9, 2026
Unprompted review
Reply from Northline Labs
Thank you, Judy! Reasonable prices and quick shipping are exactly what we aim for — and we appreciate you continuing to choose us!
So far so good
So far so good! Only a few orders so far but quality has been great. Shipping fast! Love the BOGO sales!!
June 9, 2026
Unprompted review
Reply from Northline Labs
Thank you! Great quality, fast shipping, and yeah — the BOGO deals are a nice bonus. Glad you're off to a great start with us. Appreciate you!
Fast Shipping - Amazing Product
Shipping was fast and everything was packaged perfectly! Website was easy to use. Already feeling a difference in my body from beginning my peptide journey. Def recommend Northline Labs!
June 3, 2026
Unprompted review
Reply from Northline Labs
Thank you! Fast shipping, perfect packaging, and an easy website — exactly the experience we want. Thanks so much for the recommendation!
Fast service … convenient… Will use…
Fast service … convenient… Will use them again
June 5, 2026
Unprompted review
Reply from Northline Labs
Thank you, Steve! Fast and convenient — exactly what we're going for. We'll be here when you're ready to order again!
SATISFACTION
My husband and I have been using Northline for several months. We are completely satisfied! We have actually gotten 2 family members and 2 gym partners on Peptides. My daughter is on Reta. She is down 32 lbs in 6 weeks!
Hubby and I on Ipa/tesa and Mots c. We have lost over 20 lbs each and increased our muscles. We are more than 100% satisfied with Northline products!
June 9, 2026
Unprompted review
Reply from Northline Labs
Thank you so much for the kind words and the support — it genuinely means a lot to our team. We're grateful to have you with us and we're here whenever you need anything!
Northline Labs is fantastic
Northline Labs is fantastic. Their customer service is friendly and responsive, their pricing is fair, and my order arrived incredibly fast thanks to their quick shipping. Highly recommend.
June 7, 2026
Unprompted review
Reply from Northline Labs
Thank you, Ben! Friendly support, fair pricing, and fast shipping — that's exactly what we strive for. We really appreciate the recommendation!
Reply from Northline Labs
Thank you, Casey! Easy checkout, safe delivery, good product — that's the trifecta we go for. Appreciate you!
Reply from Northline Labs
Thank you, Jared! Four orders in and going strong — that's exactly what we like to hear. Appreciate you being a regular, and here's to many more!
Orders come fast
Orders come fast. Accurate. Trustworthy. Great research results.
June 9, 2026
Unprompted review
Reply from Northline Labs
Thank you, David! Fast, accurate, and trustworthy — that's exactly the reputation we want to earn. We appreciate you!
Very happy customer
Very quick response and delivery ! Great product! Very happy costumer.
June 9, 2026
Unprompted review
Reply from Northline Labs
Thank you, Terri! Quick response, quick delivery, and a happy customer — that's the goal every time. We appreciate you!
UPS lost my very first order
UPS lost my very first order, so I contacted Northline to let them know, and a replacement order was shipped out to me that same day! I was shocked and so thankful. I got my order, then ordered more and all has been great! Wonderful customer service.
May 15, 2026
Unprompted review
Reply from Northline Labs
Thank you, Emily! When UPS dropped the ball, we wanted to make it right fast — so glad we could, and even happier you came back for more. That's exactly the kind of service we stand for. We appreciate you!
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