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 373 reviews, reviewers overwhelmingly had a great experience with this company. Customers consistently praise the high quality of the products, often noting excellent results and satisfaction with their purchases. The ordering process is described as easy and efficient, with many appreciating the quick processing and timely updates. Reviewers frequently highlight the fast shipping and careful packaging, ensuring products arrive quickly and in good condition. Customer service is also widely commended for being responsive, helpful, and providing excellent support. However, some customers also noted issues with rubber stoppers in vials, missing water for reconstitution, and occasional delays in delivery or customer service response times.

What people talk about most

Product

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

Delivery service

Users describe positive interactions with delivery service, frequently highlighting ultra-fast shipping, with... See more

Order

Customers had positive experiences with order, frequently highlighting the ease of ordering and fast... See more

Quality

Reviewers mention positive feedback about quality, with many consistently praising the high quality of the... See more

Customer service

Consumers find customer service to be positive, with many reviewers praising the quick, helpful, and... 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 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

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 5 out of 5 stars

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
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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

Rated 5 out of 5 stars

Awesome products great results

Awesome products great results. Ships fast, and always high quality. Highly recommend!

May 8, 2026
Unprompted review
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Reply from Northline Labs

Thanks Anthony — fast shipping and consistent quality is the standard we keep. Appreciate the recommendation.

— Northline Labs Support Team

Rated 5 out of 5 stars

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
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Reply from Northline Labs

Thanks Leonard — sharing with friends is the biggest compliment a small lab can get. Appreciate you.

— Northline Labs Support Team

Rated 5 out of 5 stars

Great product

Great product! Works exactly as needed with no side effects. Very happy!

May 12, 2026
Unprompted review
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Reply from Northline Labs

Thanks Sheri — glad the product worked out for you. Appreciate the review.

— Northline Labs Support Team

Rated 5 out of 5 stars

Easy and clear ordering

Easy and clear ordering. Fast shipping!

May 13, 2026
Unprompted review
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Reply from Northline Labs

Thanks Amy — simple and fast is what we shoot for. Appreciate the review.

— Northline Labs Support Team

Rated 5 out of 5 stars

Customer support very valuable and the…

Customer support very valuable and the quality of the products Is a plus,

March 17, 2026
Unprompted review
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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

Rated 5 out of 5 stars

Great products

Great products, placing my 3rd order. 100% recommended

May 14, 2026
Unprompted review
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Reply from Northline Labs

Thanks Laura — third order, that's the best signal. Glad it's working out and appreciate you taking the time.

— Northline Labs Support Team

Rated 5 out of 5 stars

Excellent

I’ve had an excellent experience with Northline Peptide Company. From the very beginning, their customer service team was professional, knowledgeable, and quick to respond to any questions I had. It’s rare to find a company that genuinely values its customers the way they do.

What stands out most is the quality of their products. Everything I’ve received has been consistent, high quality, and carefully packaged. You can tell they take pride in what they offer and prioritize customer satisfaction above all else.

Another thing that impressed me is how strongly they stand behind their products. They are transparent, dependable, and committed to making things right if needed, which gives a lot of confidence when ordering from them. That level of integrity and reliability is hard to find today.

Overall, Northline Peptide Company has exceeded my expectations in every way. Between the outstanding customer service, dependable product quality, and dedication to their customers, I would highly recommend them to anyone looking for a trustworthy peptide company.

May 8, 2026
Unprompted review
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Reply from Northline Labs

Natalie — this is one of the most detailed and thoughtful reviews we've gotten, and we're genuinely grateful you took the time. Standing behind the product and being straight with customers is the bar we hold ourselves to, so hearing it land that way means a lot. Thank you.

— Northline Labs Support Team

Rated 5 out of 5 stars

Simple clear website

Simple clear website that makes shopping for products easy. Super fast shipping and great products.
I found my place!!

May 14, 2026
Unprompted review
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Reply from Northline Labs

Thanks Tanya — glad the site was easy to navigate and shipping landed quick. Welcome aboard.

— Northline Labs Support Team

Rated 4 out of 5 stars

Customer service is great for Newbies / Fast delivery!

I’m new to peptides so I’m learning. While there are lots of options Northline Labs seems to be the fastest. I was not aware that you need to order Bac water separately happy to see you’ll be adding a prompt . Products are high quality and customer service is great.

April 13, 2026
Unprompted review
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Reply from Northline Labs

Thanks Tonia — great feedback. The BAC water prompt at checkout is a real gap and we are working on adding it so first-time buyers do not have to learn it the hard way. Glad the support side and shipping worked out for you in the meantime.

— Northline Labs Support Team

Rated 5 out of 5 stars

recommended

i had several friends i trust on the matter recommend northline for peptides and so far i have no complaints

May 14, 2026
Unprompted review
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Reply from Northline Labs

M. Barrows, appreciate the trust and the referral from your friends. Glad to hear no complaints — that's the goal. — Northline Labs Support Team

Rated 5 out of 5 stars

I have been using peptides now for…

I have been using peptides now for about 2 months. And I have been purchasing from a few different vendors. Some have slow delivery. Have limited inventory. Or don't take credit cards. Northline had NONE of these issues. Inventory was great, payments were easy, and delivery was fast! The product was just as promised! I will do my peptide shopping here from now on! Thank you Northline!

May 6, 2026
Unprompted review
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Reply from Northline Labs

Lisa, glad you found us after comparing options. No limited inventory, easy payments, and fast delivery are exactly what we aim for on every order. Welcome aboard. — Northline Labs Support Team

Rated 5 out of 5 stars

I was a satisfied customer.

I was definitely as satisfied customer. Reta is working great! However , I would prefer they use bigger vials for the higher doses. I was supposed to receive a 25% off my next order Coupon code for leaving a review and I never received it. I have sent Northline 2 emails (because there is no phone # to call.) and both emails have been ignored. 🙁 I'm satisfied with the shipping and I would definitely order again if they would send me the 25% coupon code that I was promised for leaving a review.

April 8, 2026
Unprompted review
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Reply from Northline Labs

Virginia, thank you for the review. Glad shipping and the overall experience are meeting your expectations. We appreciate the feedback on vial sizing — always looking at ways to improve. — Northline Labs Support Team

Rated 4 out of 5 stars

Prices are a little high

Prices are a little high, but quality is good. They often run deals and have discounts so it’s more affordable. You get what you pay for though, and quality costs more money. Can’t put a price on health, so all in all 4/5 stars but that missing star probably has more to do with my income level than anything.

May 13, 2026
Unprompted review
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Reply from Northline Labs

Holly, appreciate the honesty. Quality is where we refuse to cut corners, and we try to offset pricing with our BOGO and regular promotions. Glad you see the value in what we deliver. — Northline Labs Support Team

Rated 4 out of 5 stars

Satisfied customer who will continue to order from this company

I have ordered several times, having transparency, efficacy with product, and fast shipping along with affordable pricing has made me a repeat customer. I also enjoy all of the helpful information that they post on social media, I will continue to order from this company. thank you for making a great product.

May 2, 2026
Unprompted review
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Reply from Northline Labs

Leah, thank you for being a repeat customer. Transparency, fast shipping, and fair pricing are the three pillars we build on — glad they're landing. Appreciate you following our content too. — Northline Labs Support Team

Rated 5 out of 5 stars

Excellent Customer Service

I placed my first order last month, everything came exactly as described and was delivered in a timely manner. I will be ordering again!

April 20, 2026
Unprompted review
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Reply from Northline Labs

Thanks Vicki — first orders matter most, and 'exactly as described + on time' is exactly the bar. Looking forward to seeing you on the next one. — Northline Labs Support Team

Rated 5 out of 5 stars

I love how fast the products are…

I love how fast the products are shipped out and arrive. I have experienced better results with their products compared to other brands in the past.

April 8, 2026
Unprompted review
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Reply from Northline Labs

Shashank, appreciate that. Fast shipping and product quality are two things we never compromise on. Glad we're outperforming what you've tried before. — Northline Labs Support Team

Rated 4 out of 5 stars

Great Quality and Packaging, Helpful Label Suggestion

The peptides I’ve received from North Line Labs have arrived very well packaged, protected, and in good condition. So far, my experience with the shipping and product presentation has been very good.

As a suggestion, I think it would be very helpful if the labels had different colors depending on the peptide category, for example recovery, performance, fat loss, sleep/recovery, etc. That would make it much easier to recognize them quickly, especially when managing several vials at the same time.

Overall, it has been a very good experience with the product and packaging. That small detail with the label design would make the organization even more practical.

May 1, 2026
Unprompted review
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Reply from Northline Labs

Thanks Mateo — thoughtful packaging suggestion. Color-coded labeling by compound family is an idea we'll bring back to the operations side. Glad current packaging + presentation held up. — Northline Labs Support Team

Rated 5 out of 5 stars

No issues with purity and quality

No issues with purity and quality. Excellent products. Quick shipping. Great customer service!

March 20, 2026
Unprompted review
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Reply from Northline Labs

Thanks Laurie — purity + quick shipping + responsive CS. That's the bar. Appreciate the review. — Northline Labs Support Team

Rated 5 out of 5 stars

I like that your a US based…

I like that your a US based company..your catalog carries many top products..also love the 2 day shipping option..prices are very reasonable!

May 12, 2026
Unprompted review
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Reply from Northline Labs

Thanks Robert — US-based supply chain, broad catalog, 2-day shipping, fair pricing. That's the playbook. Appreciate it. — Northline Labs Support Team

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