Northline LabsReviews 

373
TrustScore 4.5 out of 5

4.7

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Review summary

Created with AI, based on recent reviews

Looking at 370 reviews, reviewers overwhelmingly had a great experience with this company. Customers consistently praise the high quality of the products, often noting their effectiveness and the positive results achieved. The ordering process is frequently described as easy and efficient, with many appreciating the fast shipping and timely delivery of their purchases. Reviewers also highlight the excellent customer service, mentioning quick responses, helpfulness, and clear communication. However, some customers also noted issues with packaging, such as vials not being crimped correctly or rubber stoppers making it difficult to draw product. A few other people also felt that customer service could be improved, citing slow replies or a lack of follow-up when problems arose. There were also occasional mentions of missing items like water for reconstitution or incorrect orders, though these were often resolved.

What people talk about most

Product

People report positive experiences with product, consistently praising the high quality and effectiveness of... See more

Delivery service

Customers consistently note positive experiences with delivery service, frequently praising the fast shipping... See more

Order

Users describe positive interactions with order, highlighting the ease of the ordering process and... See more

Quality

Reviewers consistently express satisfaction with product quality, highlighting that the peptides are... See more

Customer service

Customers had positive experiences with customer service, frequently praising the helpfulness,... See more

Reviews shaping this summary

Rated 5 out of 5 stars

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

Rated 5 out of 5 stars

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

Rated 5 out of 5 stars

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

Rated 5 out of 5 stars

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

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

4.7

Excellent

TrustScore 4.5 out of 5

373 reviews

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1-star

Asks customers to review

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Replied to 100% of negative reviews

Typically replies within 1 month

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4.7

All reviews

(373)

373 reviews in the last 12 months

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Rated 3 out of 5 stars

A bit over priced…

A bit over priced compared to other companies I have purchased from. I only order if they are giving an extra discount on top of what they have now. Wish they were more competitive with their pricing.

May 8, 2026
Unprompted review
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Reply from Northline Labs

Hi Cynn — fair feedback, and thanks for being straight with us. We work hard to keep quality high and prices fair, and we run promos pretty regularly (right now it's Buy 1 Get 1 50% off). Hope we keep earning your orders — email hello@northlinelabs.org anytime and we'll keep you posted on deals.

Rated 3 out of 5 stars

I ordered Reta

I ordered Reta . Bc I was on brand Tirzepatide 15 mg from lily ..I went to 10 mg dose of Reta.. I had no result .. they are responsive and ship quickly . They claim the Reta is from a Texas lab . Their address in Minnesota but seems to have ox
Ownership in Canada . I would be wary of a company that uses a cofe of « the bearded gorilla «  the owner I think is the bearded gorilla .. any way most of their spokes people look like they are on anabolic steroids and androgens They had a moron chiropractor advise you to use Reta and Tirzepatide together ( an Md is really gonna prescribe research pharmaceutical ) ?? . But to check first w your Md . I think think their peptides might be ok as they are easy to get . I think the Reta was horse feathers . Any way beware of medical advice from the drivers seats of Ubers etc . .. I find that hysterical .. and chiropractors and guys pumped up on steroids . Which is what most of their spokespeople look like . They are a new company and seem quite popular .. don’t know and don’t think they are scammers … but be wary of the source and quality

May 10, 2026
Unprompted review
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Reply from Northline Labs

Hi Amy — thanks for the thorough rundown, and for the kind words on our speed and responsiveness. If anything about your order wasn't right, we'd really like to make it good — drop us a line at hello@northlinelabs.org and we'll take care of you.

Rated 1 out of 5 stars

I did not feel anything whatsoever

I did not feel anything whatsoever. Very disappointed, I feel I got scammed. I have taken semaglutide in the past prescribed so I am familiar with what I should have felt. I literally didn’t get any affects.

May 25, 2026
Unprompted review
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Reply from Northline Labs

Hey Adrian — appreciate you giving us a shot, and sorry you weren't impressed. We've got a community of 20,000+ repeat researchers who keep coming back, and every batch is third-party tested at 99%+ purity, so we stand behind what's in the vial. We'd genuinely like to make this right and look into your order — shoot us a note at hello@northlinelabs.org and we'll take care of you.

Rated 5 out of 5 stars

High quality

High quality material. Fast shipping. Quick helpful, responses from customer service. I couldn't ask for any better!

June 8, 2026
Unprompted review
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Reply from Northline Labs

Thank you, Kayla! Fast shipping and responsive support are exactly what we're going for — glad it showed. We really appreciate you!

Rated 5 out of 5 stars

Personalized service

I had many questions when I first started using peptides. I reached out to get information on storage, use and reconstituting. I received a personal and detailed response which was much appreciated.

June 8, 2026
Unprompted review
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Reply from Northline Labs

Thank you, Kate! We always want people to feel comfortable reaching out with questions — glad our team could give you a detailed, personal response. Appreciate you!

Rated 5 out of 5 stars

Prompt service

Prompt service, good packaging. Great experience. KLOW!

June 6, 2026
Unprompted review
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Reply from Northline Labs

Thank you, Razya! Prompt service and solid packaging are non-negotiables for us — glad it was a great experience. See you next order!

Rated 5 out of 5 stars

Love the product

I have only ordered once so far. I do plan on making other order in a week or so . I have been please with the web site, the ordering, the timely delivery of my order. And I’m sure I will be pleased with the customer service. If I ever have to reach out to them.

May 20, 2026
Unprompted review
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Reply from Northline Labs

Thank you, Leah! Glad the website, ordering, and quick delivery all landed well — and we'll be ready for that next order. Appreciate you giving us a shot!

Rated 5 out of 5 stars

Ordered several time with no issues…

Ordered several time with no issues with products and no issues with shipping.

June 8, 2026
Unprompted review
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Reply from Northline Labs

Thank you! Several orders with zero issues on products or shipping — that's exactly what we like to hear. Appreciate you being a regular!

Rated 5 out of 5 stars

Reta, MOTC, NAD+

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 pricing and Northline Labs delivers both. I will definitely order again.

May 11, 2026
Unprompted review
Northline Labs logo

Reply from Northline Labs

Thank you, Shawn! We appreciate you doing your homework on third-party testing and pricing — that's exactly the standard we hold ourselves to. Grateful for the order, and we'll see you next time!

Rated 4 out of 5 stars

Shipping is ridiculously fast

Shipping is ridiculously fast, prcing is fair and product is good. On my third order from them.

June 2, 2026
Unprompted review
Northline Labs logo

Reply from Northline Labs

Hi Linden — three orders in, that means a lot. Glad the fast shipping and fair pricing are landing right. Thanks for sticking with us!

Rated 5 out of 5 stars

Order came fast and we are very happy

Order came fast and we are very satisfied with the products.

May 29, 2026
Unprompted review
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Reply from Northline Labs

Thanks John! Fast delivery and a satisfied customer — that's the goal every time. We appreciate the support!

Rated 5 out of 5 stars

Decent shipping times and packaged…

Decent shipping times and packaged well. Very pleased with my order and will order again. 5 stars!

May 28, 2026
Unprompted review
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Reply from Northline Labs

Thank you, Marvin! Glad it arrived well-packed and on time — looking forward to the next one. 5 stars right back at you!

Rated 5 out of 5 stars

Early on in my journey

Early on in my journey, but arrived quickly and look forward to continued progress.

June 7, 2026
Unprompted review
Northline Labs logo

Reply from Northline Labs

Thanks Dan! Glad it arrived quickly, and we appreciate you choosing us. We're here whenever you need us!

Rated 5 out of 5 stars

Fast shipping + as described

Ordered reta + bac water. Quality as described. Shipped fast. One of my trusted vendors. Thanks!

May 30, 2026
Unprompted review
Northline Labs logo

Reply from Northline Labs

Thank you, Maria! “Trusted vendor” is the best thing we can hear — glad the quality and speed delivered. Appreciate you!

Rated 5 out of 5 stars

I’ve ordered twice now from this…

I’ve ordered twice now from this company. Pleased with the efficiency of processing the order and timely updates. Packages have arrived without damages and without any issues. Highly recommend!

June 7, 2026
Unprompted review
Northline Labs logo

Reply from Northline Labs

Thank you! Two orders in and glad the process has been efficient with timely updates both times. We appreciate the recommendation!

Rated 4 out of 5 stars

Honest Review Repeat Customer

I've been receiving Northline Labs peptides. KLOW, MOTSC, RETA. Orders are received quickly. No issues with quality. Honest review though, the rubber stoppers in the vials leave very little room to draw my peptides and I bend a lot of needles.

June 1, 2026
Unprompted review
Northline Labs logo

Reply from Northline Labs

Hi Sabrina — appreciate the honest review and the repeat business! Good call on the vial stoppers; that's exactly the kind of note that helps us tighten up our packaging. Anything you need, we're at hello@northlinelabs.org.

Rated 5 out of 5 stars

Repeat buyer with no complaints…

I have made multiple orders/purchases and each time they arrived on time and in great condition. No complaints here. I will continue to order from Northline.

April 15, 2026
Unprompted review
Northline Labs logo

Reply from Northline Labs

Thank you, Brett! Multiple orders, on time and in great shape every time — exactly what we aim for. Appreciate you being a regular!

Rated 5 out of 5 stars

Order to delivery was TWO DAYS

Order to delivery was TWO DAYS! My second order from Northline. Very happy with the product and will continue to order. Only suggestion would be to ship 50mg in bigger vial than 10mg.

June 1, 2026
Unprompted review
Northline Labs logo

Reply from Northline Labs

Thank you, Joe! Two-day delivery on your second order — we love that. Great suggestion on the vial sizing too; that kind of feedback genuinely helps. Appreciate you coming back!

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