Northline Labs Reviews 

Absolutely loved the product, worked super well, I am extremely satisfied with the results. My order was delivered very fast and fully in tact, along with a discount code. Very happy, and a great experience.

Ordered Reta and bacteriostatic water and followed the reconstitution instructions very carefully. Tiled vile to the side to mix. Mixed 2ml in to the 10mg vile. Gently swirled. Stored at 37 degrees. It did nothing. Having taken Tirz for the past couple of months (only 2.5ml), I was surprised that the food noise and cravings came back. Really wanted to go this route but it didn’t work.

great company good quality products

I ordered a 10ml bottle of Bacteriostatic water along with a few other peptides. However, Northline labs sent me a 3ml bottle of Bacteriostatic water instead. I emailed them and they quickly recognized their mistake but has failed to send me the correct order and has stopped responding to emails. There is no phone number and the only way to communicate is through email. So if you are thinking about ordering from Northline labs, you might want to reconsider and search for another company. You won't get your money back, they will not correct the order that they made a mistake on and will stop responding to emails altogether.

The product presentation is amazing. I love the QR Code to the product COA and the level of detail the company takes to produce a good product.

Ive got plenty of stuff from Northline labs and it has never disappointed me because it always arrives on time and sometimes a little bit before the time it says it's supposed to arrive just great. I've also never received a broken or lost package before so impressed.

Product looks great and has verifiable COA’s.

Looks like a winner in my book. ⭐️⭐️⭐️⭐️⭐️

Product showed up on time and packaged nicely, I've ordered a ton over the last 6 months. Had questions and was responded to almost immediately. Keep up the good work!

Super fast delivery, as well as very effective products.

I will continue to order from Northline

Great company they answered all of my questions and I was surprised by how fast I received my product

Update 8/26/26: Northline did respond and made my order right although it took them some time. They really need to work on their communication and promptness. On a good note, they did send the 20mg Reta I originally ordered (I was able to keep the 15mg) and complementary BAC water. Hopefully they will work to tighten their quality assurance around orders, making sure customers are getting what they paid for. Overall I am having a positive response to the Reta going into my 3rd week.

I received my peptides from Northline Labs on 8/11/2026 Order #86330. I paid $129.99 for a Reta GLP-3 – Premium Research Peptide - 20mg. However I received a 15mg vial. This is a difference of $30. I emailed them with pictures of the vial they sent. Northline labs admitted the “mixup” and said “ We're not able to offer refunds or credits, but I want to get you the correct item. We've received your message and will follow up on this thread once we've reviewed it.”. I haven’t received a response after that. I don’t like feeling like I got cheated. I ordered the 20mg vial and that’s what I should have received, not a lower dosage.

This brand has stolen my content on TikTok and is using it to get people to buy their peptides when I actually only promote a source that is clean. Do not buy from them!

I’m surprised to see so many negative reviews because I am impressed with the product. Anyone who doesn’t do their own due diligence beforehand should know the product needs to be reconstituted and you’ll need to get the supplies to do so and to administer. Of course they can’t acknowledge this for any purpose other than “research” because of FDA approval. I’m on my second dose of Reta, down 7 pounds, and I feel great. The shipping was fast - UPS lost my package so it took a few extra days - but that’s not the company’s fault.

I purchased some peptides from them but they were not any good. I added Bac water and the turned cloudy and remains cloudy. I don't recommend buy from them. They refuse to answer my emails about the product being bad.

I ordered some research peptides from northline labs while the delivery was fine my order was wrong I received part of my order but not the other part so far I've sent them three emails which is the only way to contact them and I have gotten no response I'm out over $100. So this is a warning to anyone who's thinking about ordering from northline labs you will not be able to get in contact with them, they won't contact you back and you will be out your money and your product.

Order received at expected. Fast shipping. Well packaged.

I ordered glp3rt from this company and their product is no good. I've been taking glp3rt since January. Normally I order from Onyx Research and I've never had any issues with their product. But this company is a different story. The product is not working as it should. It doesnt stop the cravings at all! In fact I can tell no change in appetite or anything with this one. Also my stomach as really been hurting on their product and I never had that with Onyx research product, and I've taken theirs for months now. I've reached out to the company multiple times with no response back. I'm going to dispute the charges bc I bought 3 bottles and it was over $200 dollars. But I'm not taking this product anymore. Its scary bc it causes stomach pain and I dont trust that. I absolutely do not recommend this company. Their product sucks and so does their customer service!

Reached out to the company to ask about reconstitution and dosing instructions and they are unwilling to assist, because they are trying to cover their ass knowing very well that they are selling the product for human consumption. Waste of money and zero trust. Do not order from here.

Beware..It's crazy how this seems like a completely different company from my experience with them.. if we're talking about the same company, but I only got one response on an order that at the very last minute was marked to be resent to the sender. Funny thing that cancels out my route insurance that I paid on it. Not to mention I paid for fast shipping and I purchased this order on 7/31. No one will answer my emails. No one will get back in contact with me. UPS says I can't do anything and conveniently unless the package is actually delivered to the wrong person excluding me or the sender,..!!! that requested for the package to be returned to them !!!,Then I don't even get the insurance to be covered on it super shady .. and to add to that conveniently it was an extremely large order!!

If I can give it 0 star I would. I have ordered Retatrutide from this company, and I have to say I was very disappointed. First of all it took six days to arrive second it was left under my door where the sun is hitting it relentlessly by the time I came home I got the product it was super hot such a waste of money. I don’t feel comfortable using it. Retatrutide is supposed to be kept in the freezer to begin with very unsatisfied.