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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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
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
So far my personal experience has been great, you just need to do your research and know what you are doing.. I have been using it for two weeks… Also,if you are not taking the right dose you will not... 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
4.6
Excellent
388 reviews
Asks customers to review
This company invites their customers to review, whether positive or negative
Replied to 69% of negative reviews
Typically replies within 1 month
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Great customer service and super timely…
Great customer service and super timely shipping. Highly recommend!
May 15, 2026
Unprompted review
Reply from Northline Labs
Andy, thank you for the recommendation. Fast shipping and responsive support are two things we never compromise on. Appreciate the repeat business. — Northline Labs Support Team
Great company
Great company, quick shipping and customer service is top notch. I had an issue with a product and they responded quickly and shipped out a new vial.
May 11, 2026
Unprompted review
Reply from Northline Labs
Kimberli, thank you. Glad we were able to resolve the issue quickly and get a replacement out to you. That's the standard we hold ourselves to. Appreciate your trust in us. — Northline Labs Support Team
Northline is the best!!
Northline is the best!!! Always super fast in customer support AND shipping! Hands down my favorite company to order from.
May 15, 2026
Unprompted review
Reply from Northline Labs
Liz, that means a lot. Support and shipping speed are the two things we refuse to let slip. Thank you for making us your go-to. — Northline Labs Support Team
I will choose this peptide company over any other
One of the best hotel companies customer service is great when you email them they get right back to you I never had any bad experience with this company. This company I will continue on buying from and they give you information about the benefits
April 10, 2026
Unprompted review
Reply from Northline Labs
Jay, really appreciate the loyalty. We take pride in fast email response times and making sure every customer has a smooth experience. Thank you for choosing Northline. — Northline Labs Support Team
The highest quality service and…
The highest quality service and products I've found. Their peptides have been great for my health.
May 14, 2026
Unprompted review
Reply from Northline Labs
Jeff, thank you. Quality service and quality product are what we aim for on every order. Appreciate you taking the time to share your experience. — Northline Labs Support Team
Great product with quick shipping!
May 15, 2026
Unprompted review
Reply from Northline Labs
Thanks David — glad it landed quickly. Appreciate the review.
— Northline Labs Support Team
Experience was very good
Experience was very good. Made 2 orders on the same day. Both were shipped the same day. The second took an extra week to get. That was on USPS. This was a great experience.
April 17, 2026
Unprompted review
Reply from Northline Labs
Thanks for the review and for ordering twice in one day — that means a lot. Sorry one of the deliveries took an extra week; quick note that we ship via UPS, so it's worth checking that tracking link if it comes up again. Appreciate you.
— Northline Labs Support Team
Very happy with the whole process
Very happy with the whole process. Competitive prices with the BOGO. After the purchase, i got a shipping confirmation quickly. I will order from them again.
May 12, 2026
Unprompted review
Reply from Northline Labs
Thanks Bigwheell — BOGO and fast shipping are exactly what we work hard to keep consistent. Looking forward to your next order.
— Northline Labs Support Team
Northline Labs is great to work with!
Northline Labs have been very easy to work with and very responsive. I have contacted them to ask questions on multiple occasions and they responded within a few hours. They are fast at shipping and have great product options.
May 1, 2026
Unprompted review
Reply from Northline Labs
Matt, thank you. Responsiveness is something we take seriously — glad it came through on your end. Appreciate the kind words about our product selection. — Northline Labs Support Team
100% ordering again
100% ordering again. Love this product and videos they share
May 8, 2026
Unprompted review
Reply from Northline Labs
Thanks Cody — glad the videos are helping. We will keep them coming. Appreciate you.
— Northline Labs Support Team
Reply from Northline Labs
Thanks Andrew — appreciate the recommendation. Glad it landed well.
— Northline Labs Support Team
Ordering was easy
Ordering was easy. I love the amount of information Northline Labs provides, I find it to be very helpful. Delivery was excellent, my products arrived ahead of the original estimate.
March 20, 2026
Unprompted review
Reply from Northline Labs
Thanks Debra — glad the product information on the site was useful and that delivery beat the estimate. Appreciate you taking the time.
— Northline Labs Support Team
Glp3 testing has proven to be effective
Glp3 testing has proven to be effective
May 14, 2026
Unprompted review
Reply from Northline Labs
Thanks for the review and for sharing your testing notes — appreciate it.
— Northline Labs Support Team
Everything here is 100% legit and…
Everything here is 100% legit and manufactured to high quality control standards. Shipping was also fast and free. I would highly recommend to anyone out there buying peptides.
May 11, 2026
Unprompted review
Reply from Northline Labs
Thanks tyler — quality control and fast shipping are non-negotiable on our side, glad it came through that way. Appreciate the recommendation.
— Northline Labs Support Team
I’ve ordered from Northline multiple…
I’ve ordered from Northline multiple times now and have had no problems whatsoever every time. Checkout process is super easy and delivery is quick. Products come well packaged and definitely are legit. I’ve got the results I wanted and more from everything I’ve ordered!
May 14, 2026
Unprompted review
Reply from Northline Labs
Thanks Mark — multiple orders without a hiccup is exactly the consistency we work to keep. Glad it has been smooth on your end. Appreciate you.
— Northline Labs Support Team
Awesome products great results
Awesome products great results. Ships fast, and always high quality. Highly recommend!
May 8, 2026
Unprompted review
Reply from Northline Labs
Thanks Anthony — fast shipping and consistent quality is the standard we keep. Appreciate the recommendation.
— Northline Labs Support Team
Amazing products and fast shipping
Fast shipping and great products I recommended to all my friends and will continue to buy.
May 14, 2026
Unprompted review
Reply from Northline Labs
Thanks Leonard — sharing with friends is the biggest compliment a small lab can get. Appreciate you.
— Northline Labs Support Team
Great product
Great product! Works exactly as needed with no side effects. Very happy!
May 12, 2026
Unprompted review
Reply from Northline Labs
Thanks Sheri — glad the product worked out for you. Appreciate the review.
— Northline Labs Support Team
Reply from Northline Labs
Thanks Amy — simple and fast is what we shoot for. Appreciate the review.
— Northline Labs Support Team
Customer support very valuable and the…
Customer support very valuable and the quality of the products Is a plus,
March 17, 2026
Unprompted review
Reply from Northline Labs
Thanks Donny — appreciate you calling out both the support side and the product side. Means a lot.
— Northline Labs Support Team
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