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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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
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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
Company replied
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
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Replied to 100% of negative reviews
Typically replies within 1 month
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Highest quality …
Northline has the highest quality products ive ever received. If I want a quality product I always order from Northline.
May 26, 2026
Unprompted review
Reply from Northline Labs
Thank you, Shannon! “Highest quality you've ever received” genuinely means a lot — we work hard for that. Appreciate your loyalty!
NL has nothing but amazing products
NL has nothing but amazing products. It’s an easy process to order and the shipping is fast. Definitely recommend
June 7, 2026
Unprompted review
Reply from Northline Labs
Thanks Bill! Easy ordering, fast shipping, and a recommendation — can't ask for more. We appreciate you!
They are using false and illegal…
They are using false and illegal advertising taken from my friends over at Overtime Men’s Health. IF YOU ARE NOT KNOWLEDGABLE ENOUGH ON THE PRODUCT YOU ARE SELLING THEN YOU SHOULD NOT BE SELLING IT POINT BLANK
June 8, 2026
Unprompted review
Reply from Northline Labs
Hi Kolby — appreciate you flagging this, and we take it seriously. We'd genuinely like to understand what you're referring to so we can address it directly. Mind emailing us at hello@northlinelabs.org? We read every message.
Shipping and ordering was very smooth
Shipping and ordering was very smooth
Great prices
4 stars bc I Wished there were More details in mixing
May 15, 2026
Unprompted review
Reply from Northline Labs
Thank you, Monique! So glad the ordering and shipping were smooth and the pricing worked for you. Great call on the mixing details — we have a reconstitution reference and a Draw & Dose calculator on the site, and you're always welcome to email hello@northlinelabs.org with any reconstitution questions and our team will walk you through it. — The Northline Labs Team
I've had such a great experience with…
I've had such a great experience with Northline Labs Piptides. From weight loss to pain relief. Thank you
June 7, 2026
Unprompted review
Reply from Northline Labs
Thank you so much for the kind words, Cindy — we're thrilled you've had such a great experience with us, and we're grateful for your trust and support. — The Northline Labs Team
I purchased a few peptides and found…
I purchased a few peptides and found the packaging a little concerning. There were no coa numbers on any vials and very little info with the order. Now when I try to access the website it won’t load. Very concerned.
May 27, 2026
Unprompted review
Reply from Northline Labs
Hi Scott — thank you for flagging this, and we're sorry for the concern. Every product we carry is third-party tested to 99%+ purity, and the full Certificates of Analysis are available on our COAs page; we're also happy to send the COA for your specific order. Please email hello@northlinelabs.org with your order number and we'll make sure everything is sorted for you. (If the site won't load, that's usually a network or browser filter on certain connections — trying a different browser or connection typically resolves it, and our team is glad to help by email in the meantime.) — The Northline Labs Team
BEST PETIDE SOURCE ALL OVER USA
Product are high quality tested and very cost effective. Customer service is excellent as well as their delivery system.
May 25, 2026
Reply from Northline Labs
Thank you, Ernesto — that means a lot! We're proud of our quality, third-party testing, and fast delivery, and we're grateful for your support. — The Northline Labs Team
Very quick delivery well packaged quality products
Very quick delivery well packaged great products Reta n cjc/ipa great price for quality Simple to order great website
May 25, 2026
Reply from Northline Labs
Thanks Pancho — glad the Reta + CJC/Ipa landed quickly and at the right price. Appreciate the review.
— Northline Labs Support Team
Reply from Northline Labs
Thanks James — appreciate the review. If you have questions on protocols or anything as you get started, reply to your shipping email and we will help.
— Northline Labs Support Team
High quality and quick shipping
High quality and quick shipping. I ordered Klow and Bac. Top quality around
April 24, 2026
Unprompted review
Reply from Northline Labs
Thanks Heather — glad the Klow and Bac landed quickly and met the bar. Appreciate the review. — Northline Labs Support Team
Very prompt to take your money and ship…
Very prompt to take your money and ship but when something goes wrong you might as well be engaging in a brick wall. I’ve sent 6 emails and keep getting the same basic standard shipping email. Doesn’t matter what I ask it’s till the same standard response. Also makes me suspicious of location as the responses are always in the late evening central time. Profits over customers, stay away!!!!!
May 27, 2026
Unprompted review
Reply from Northline Labs
Russ — this isn't the experience we want and the template-loop is a real failure on our end. Please email hello@northlinelabs.org with your order number and what you've been asking about — it will route to a human reply and we'll resolve it. The late-evening replies are just our working hours, nothing more. — Northline Labs Support Team
Reply from Northline Labs
Thanks Kristy — quick shipping, good pricing, reliable product is exactly the bar we aim for. Appreciate the review. — Northline Labs Support Team
Great product
Great product, communication, and follow up. Highly recommended.
May 29, 2026
Unprompted review
Reply from Northline Labs
Thanks Joseph — product, communication, and follow-up all dialed in is the goal. Appreciate the review. — Northline Labs Support Team
Fast response times and effective…
Fast response times and effective products. Really great customer service! :)
May 28, 2026
Unprompted review
Reply from Northline Labs
Thanks Darrow — fast response and effective products is what we're built for. Appreciate the review. — Northline Labs Support Team
Northline Labs are very prompt with…
Northline Labs are very prompt with shipping and once when I had a problem they were quick to correct the issue. My only slight complaint is that the vial packaging sometimes is not of a very high quality and can come loose causing an air leak.
May 15, 2026
Unprompted review
Reply from Northline Labs
Thanks Veronica — appreciate the honest feedback on the vial seals. We've flagged it for the packaging side and are tightening QC on cap-crimps. If a future order ever arrives with a loose cap, email hello@northlinelabs.org with a photo and we'll make it right. — Northline Labs Support Team
Reply from Northline Labs
Thanks Robin — efficient is what we aim for. Appreciate the review. — Northline Labs Support Team
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
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