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
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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 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
4.7
Excellent
378 reviews
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Replied to 90% of negative reviews
Typically replies within 1 month
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Placing my 3rd large order with…
Placing my 3rd large order with Northline Labs, I’ll stay with them from here on out. I’ve been on GLPs for 3 years, taking it low and slow…mostly because I’ve hopped around looking for a reliable, quality supplier. Nothing has put my weight loss into full speed like Northline’s product. I’ve lost the same in 6 months with this company that I lost on 20 months with 4 other suppliers. And I’m still losing at half the dose I was using with my last supplier, I’ve had to scale back so I don’t lose too quickly. Shipping is quick and customer service is spot on. SO happy I don’t have to keep looking for better, this is it!
May 11, 2026
Unprompted review
Reply from Northline Labs
Thanks for the repeat order and the kind words on shipping and support. Glad we've earned the trust. — Northline Labs Support Team
The vials were not crimped correctly
The vials were not crimped correctly, when I was trying to pop the seal the entire top came off. Sent email to notify Northline but I never recieved any reply.
April 2, 2026
Unprompted review
Reply from Northline Labs
Steve — sorry the cap-crimp on that vial was off and that your email didn't reach us. Please resend to hello@northlinelabs.org with your order number and a photo of the vial — it'll route directly to a human and we'll resolve it. — Northline Labs Support Team
I love their products
I love their products. The minute I run out, I won’t hesitate to order more since it so easy to.
May 13, 2026
Unprompted review
Reply from Northline Labs
Thanks RJ — easy reorders is exactly what we built the site for. Appreciate the review. — Northline Labs Support Team
Best Supplier Around
Fastest turnaround and shipping times, quality compounds and fair pricing. Look no further if you’re in the market!
May 4, 2026
Unprompted review
Reply from Northline Labs
Thanks Connor — fastest turnaround, quality compounds, fair pricing is the trifecta we aim for. Appreciate the review. — Northline Labs Support Team
Best quality out there
Best quality out there. Very quick shipping, quality product, great communication, zero complaints. Highly recommend buying from
May 19, 2026
Unprompted review
Reply from Northline Labs
Thanks dom — quick shipping, quality, zero complaints is exactly the bar. Appreciate the review. — Northline Labs Support Team
These guys offer the best quality…
These guys offer the best quality peptides on the market. Very good pricing and fast shipping highly recommend!!
May 21, 2026
Unprompted review
Reply from Northline Labs
Thanks Zack — quality peptides, good pricing, fast shipping is the trifecta we aim for. Appreciate the review. — Northline Labs Support Team
Great Product!
I have ordered with Northline a couple of times with no issues. The product of Reta is working great!
March 26, 2026
Unprompted review
Reply from Northline Labs
Thanks for the loyalty — multiple orders with no issues is exactly what we work to deliver. Glad the Reta is working out.
— Northline Labs Support Team
No communication
I have written 3 emails about different subjects and I haven't received 1 response. The products have been good, but the last 2 deliveries have been slowed/delayed by UPS and I wanted to make Northline aware of that.
May 21, 2026
Unprompted review
Reply from Northline Labs
Hi Janet — apologies if any of your emails went unanswered; that is not our standard turnaround. Please forward them to hello@northlinelabs.org and we will respond same day. On the UPS delays — those are on the carrier network and not under our control once the package is handed off; we ship the same day orders are placed. Glad the products themselves have been good.
— Northline Labs Support Team
I ordered two 10mg of Sermorelin and…
I ordered two 10mg of Sermorelin and two Retatrutide. I received 1 Sermorelin and 1 impemorelin. Not off to a great start. Too early to tell if product is legit or not but I cant trust this company to order again.
May 1, 2026
Unprompted review
Reply from Northline Labs
Hi Ryan — if the order delivered does not match the items on your packing slip, please email hello@northlinelabs.org with your order number and a photo of the vial labels so we can verify and resolve. We do not see an open ticket from you on file. Apologies for the rough first impression — happy to make it right once we can identify the order.
— Northline Labs Support Team
Great quality and product
Great quality and product. Highly effective. Will keep purchasing from here
April 7, 2026
Unprompted review
Reply from Northline Labs
Thanks Manny — "will keep purchasing" is the best signal we can get. Appreciate the review.
— Northline Labs Support Team
Great Experience and Great Product
Northline Labs was recommended by a family member and what a great choice it was. My first order experience was excellent as their website made it easy to find what I was looking for and the product quality is second to none.
May 20, 2026
Unprompted review
Reply from Northline Labs
Thanks Pat — referrals from family are the best kind of new customer. Glad the site was easy to navigate and the product met the bar.
— Northline Labs Support Team
Their products are legit
Their products are legit. They ship via UPS, delivery was fast and I was able to track. Northline Lab is authentic.
May 10, 2026
Unprompted review
Reply from Northline Labs
Thanks Divine — fast UPS delivery, easy tracking, authentic product is exactly what we ship for. Appreciate the review. — Northline Labs Support Team
Reply from Northline Labs
Thanks Ace — quick and clean is what we shoot for. Appreciate the review.
— Northline Labs Support Team
Excellent delivery time and good…
Excellent delivery time and good pricing! I've already made a second order with them!
May 12, 2026
Reply from Northline Labs
Thanks Jodi — second order already, that's the best signal we can get. Appreciate it.
— Northline Labs Support Team
Order came quick and purety was spot on.
May 20, 2026
Unprompted review
Reply from Northline Labs
Thanks Jeremy — quick and on-spec is the bar. Appreciate the review.
— Northline Labs Support Team
Fast shipping and processing times
Fast shipping and processing times. Easy to navigate website
April 15, 2026
Unprompted review
Reply from Northline Labs
Thanks — fast turnaround and a site that doesn't get in the way are non-negotiable on our side. Appreciate the review.
— Northline Labs Support Team
Quick and easy ordering
Quick and easy ordering. Product is great and high quality. Shipping is fast!
May 19, 2026
Unprompted review
Reply from Northline Labs
Thanks Jeannette — quick, simple, and high-quality is the trifecta. Appreciate the review.
— Northline Labs Support Team
Great product
Great product. Fast shipping and great customer service! I actually purchase all my peptides here and I’ve recommended it to anyone who brings up the subject.
March 20, 2026
Unprompted review
Reply from Northline Labs
Thanks Cheyanne — active recommending to friends is the biggest compliment. Appreciate you.
— Northline Labs Support Team
Fantastic
Fantastic. After the hiccups on my first order, I paid closer attention when checking out to look for tracking. Been fantastic ever since. I won’t buy from anywhere else. Peptides are expensive regardless, it’s an expensive way to be healthy. But here is the lower end of the quality price range!
May 19, 2026
Unprompted review
Reply from Northline Labs
Thanks Kevin — glad it's been fantastic since the early order. Real quality at fair pricing is what we work to keep consistent. Appreciate you sticking with us.
— Northline Labs Support Team
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
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