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
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Review summary
Created with AI, based on recent reviews
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Reviews shaping this summary
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
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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
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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
378 reviews
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Yes Northline Labs
Over the course of the year, I’ve ordered from a variety of peptide companies and have concluded that Northline Labs is far superior in quality, communication, and reliability.
If you’re considering your next peptide purchase, you owe it to yourself to check out Northline Labs. You will not be disappointed.
May 18, 2026
Unprompted review
Reply from Northline Labs
Pauline — "far superior across quality, communication, and reliability" is the highest compliment we can get, especially after a year of comparison shopping. Thank you for the trust and the recommendation.
— Northline Labs Support Team
There products actually work and are…
There products actually work and are excellent quality. I’ve used simple peptides in the past with no results, I had great results with Northline and noticed a difference starting the second week
May 1, 2026
Unprompted review
Reply from Northline Labs
Thanks Mike — appreciate the detailed review. Glad it's been a clear step up for you.
— Northline Labs Support Team
I was able to talk with a real person…
I was able to talk with a real person that was actually an American and great service
April 8, 2026
Unprompted review
Reply from Northline Labs
Thanks Greg — really appreciate you taking the time to share that. We keep support in-house so you always reach a real person on the team. Happy to have you with us.
— Northline Labs Support Team
Great products and fast delivery
Great products and fast delivery. I will definitely be ordering from Northline again!
May 1, 2026
Unprompted review
Reply from Northline Labs
Thank you, JH! We appreciate the kind words and look forward to serving you again. — Northline Labs Support Team
The products work as stated
The products work as stated , price is very fair . The one detail to tighten up would be customer service , I tried multiple times to call to no answer never a call back . They definitely respond to emails but when I needed further clarification I went to YouTube for answers
May 17, 2026
Unprompted review
Reply from Northline Labs
Larry, thank you for the honest feedback. Glad the products are working well and the pricing feels fair. On the phone issue — our line is text-only, so calls won't connect. For anything you need, email hello@northlinelabs.org and we'll get back to you within hours. Appreciate you taking the time to write this. — Northline Labs Support Team
Very easy to order
Very easy to order, the price was and the shipment came promptly
April 23, 2026
Unprompted review
Reply from Northline Labs
Appreciate the review, Alan. Glad the ordering process was smooth and shipping was quick. We're here if you need anything. — Northline Labs Support Team
Northline was recommended by family and…
Northline was recommended by family and after researching online with quality and pricing comparable sites we do choose to use Northline.
Shipping was very fast with secure packaging.
Order was accurate and product vials and labeling was very extremely professional.
So far my wife and I have had good results that we would expect from a quality peptide supply.
Pricing was reasonable but with certain deals at the time I feel like we got a great deal.
We will be purchasing again very shortly.
We definitely recommend Northline for all your peptide related needs.
May 6, 2026
Unprompted review
Reply from Northline Labs
K. Hoff, this is the kind of feedback that means a lot to us. The fact that you did the research, compared options, and still chose Northline is exactly the standard we hold ourselves to. Glad the packaging, labeling, and quality all met expectations. We look forward to your next order. — Northline Labs Support Team
Great product
Great product. Fast delivery. Super happy with the quality and results
May 16, 2026
Unprompted review
Reply from Northline Labs
Thank you, T.R. Great to hear the quality and delivery both hit the mark. Appreciate you taking the time to leave a review. — Northline Labs Support Team
Ease of order via website
Ease of order via website, status of order, and fast delivery. Product was exactly what I ordered. Second time placing order with Northline Labs and will continue to do so. Great service and value.
May 16, 2026
Unprompted review
Reply from Northline Labs
Julie, thank you for coming back for a second order. That repeat trust is what we work hardest to earn. Glad the ordering experience, delivery, and product all came through again. — Northline Labs Support Team
payment can be tricky
payment can be tricky, shipping is pretty quick quality has been good packing.is questionable but peps have been ok
May 1, 2026
Unprompted review
Reply from Northline Labs
Mali, appreciate the honest feedback. We know payment options in this space can be limited and we're actively working to make checkout smoother. On packing — every order ships insulated with protective packaging, but if something arrived in less-than-ideal condition, email us at hello@northlinelabs.org and we'll make it right. Glad the products themselves are delivering. — Northline Labs Support Team
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
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