@BeeKind I’ve been pretty active on this website for a while now and have made several reviews. ZC labs is legit, I even made a review on them a month or so ago. Prices are affordable with testing COAs available.

This is a vendor review submitted by HowStrongareYou on PeptideCritic.com. Rating: (5/5) · Peptide: MOTS-c · Reviewed September 24, 2026 ive ordered from them multiple times, SS-31, MOTS-c, bpc157, tb500, and more. Everything is working as it should! I'll be making another order soon. Read the full review on Evolve BioPep's page Shop Evolve BioPep Discuss this review, share your own experiences, or ask questions about the vendor. Please keep discussions respectful and factual.

This is a vendor review submitted by robert929045 on PeptideCritic.com. Rating: (5/5) · Peptide: Glow · Reviewed September 21, 2026 I placed a larger order (for me) for research peptides on September 2. It contained 11 different peptides. The shipping via UPS 2nd day air was free. Initially, UPS reported delivery was scheduled… Read the full review on Puratek Peptides' page Shop Puratek Peptides Discuss this review, share your own experiences, or ask questions about the vendor. Please keep discussions respectful and factual.

In your review you stated "Despite that COA, I developed concerns about the consistency of the tirzepatide from this batch compared with material from two other suppliers." What concerns, and what prompted their development?

This is a vendor review submitted by mmp on PeptideCritic.com. Rating: (5/5) Review Great prices and fast shipping. CoAs are available online, printed copies have also been added. Usually add some free gift vial or\and Hospira bac water. Shop IDUN Peptides Read the full review on IDUN Peptides' page Discuss this review, share your own experiences, or ask questions about the vendor. Please keep discussions respectful and factual.

This is a vendor review submitted by kimbreitbarth on PeptideCritic.com. Rating: (5/5) Review Purchased a GLP for research and the pricing was incredible. Labsourced offered a BOGO & allowed me to stack a welcome code with ach discount. Bought a large qty of 30 mg vials for less than ive seen anywhere. Im set for more than a year and plan to purchase more as a safeguard. Product arrived promptly, COA was available 3rd party and matched the vial lot code. Reconstituted my first vial mid Sept '26 with no cloudiness, gel or concerns. Injected without any side effects. Very happy. Shop Labsourced Peptides Read the full review on Labsourced Peptides' page Discuss this review, share your own experiences, or ask questions about the vendor. Please keep discussions respectful and factual.

This is a vendor review submitted by horsefoodpro on PeptideCritic.com. Rating: (5/5) Review Fastest shipping and fantastic packaging to keep things protected! Bought several singles to try all are good! Will do business with going forward! Shop Seacoast Aminos Read the full review on Seacoast Aminos' page Discuss this review, share your own experiences, or ask questions about the vendor. Please keep discussions respectful and factual.

This is a vendor review submitted by bigman01 on PeptideCritic.com. Rating: (5/5) Review I want to preface my review by saying I put my order in right before they changed owners (Like 2 days before). Received my GLP3 within a week, and have had zero issues with it. So far it’s working perfectly, and with noticeable effects at 1.5mg a week. I really hope the new owners are just as good, because this was my go to source for GLP3 at a great price. Shop Crush Research Read the full review on Crush Research's page Discuss this review, share your own experiences, or ask questions about the vendor. Please keep discussions respectful and factual.

This is a vendor review submitted by Frederic on PeptideCritic.com. Rating: (5/5) Review I have been using puratek for a few orders now. And I have been happy with the result. In my last order they made a mistake and forgot one vial. I called them and after a few days the mistake was corrected. The customer service was not perfect, but it was good enough. And because the price is also good I think this company deserves a 5 stars rating. I will continue to use to them for almost all my needs, and I will update this review if the quality of service or of the product were to change. I hope this review is helpful to others. Frederic Shop Puratek Peptides Read the full review on Puratek Peptides' page Discuss this review, share your own experiences, or ask questions about the vendor. Please keep discussions respectful and factual.

This is a vendor review submitted by ManicXmedic on PeptideCritic.com. Rating: (5/5) Review I put in an order recently trying to take advantage of a labor day sales event. Everything was going smooth untill I biffed it by sending bitcoin without an order number and I didn't send a transaction hash back to them either. My order timed out but I sent some messages. Even though the issues were from my end, they quickly helped me. My order was back on track in no time. All of the interactions I had with them were very positive. At no point did I get the feeling like I had annoyed or frustrated anyone with my mistakes. I got some gkc-cu 50, n/a semax (listed as Adamax984), pump and burn and b12. So far I've only researched the latter 2 from them and it's exactly as expected. I joined their discord and since then I saw on their discord they were offering a discount during 9/11 for first responders and veterans/active duty. It wasn't broadly announced like it was marketing. It really seemed like a genuine thank you, which came with their literally thanking me. Aside from how well my interactions with them have been, I see that they're looking to improve testing which is great for me as I'm not as knowledgeable in this area, I know the people here are really good with it though. Overall, I'd use them again for singles without hesitation Shop StudzPeptides Read the full review on StudzPeptides' page Discuss this review, share your own experiences, or ask questions about the vendor. Please keep discussions respectful and factual.

@jdot They have some really nice prices even before discount code. Discount code seems to pay for shipping (depending upon what you order).

@coby this is done extensively in the grey market. A single vial reseller doesn’t need to deal with wholesale orders as they are profiting heavily on single vial markups.

I’ve bought three times from SA in the past three months, mostly during their recent big sale. All shipped quickly and accurately. They even came with those single vial 3d printed containers. Peps were exactly as advertised. I’d buy from them again for single vials.

@Stevepep said: I saw Costco Confused!! Did PX Peptides call themselves Costco of RUO? Really? LOL

@bobs So they are Nexaph but a lot more expensive? For what exactly? I noticed even Peptidology nowadays displays cGMP on their site. Not sure what that means exactly. Should ping Josh, the owner. He's the nicest vendor I have seen.

This is a vendor review submitted by cece on PeptideCritic.com. Rating: (5/5) Review So I have tried different peptides and I came across genpeptides here on peptides critics. Let me tell you it’s worked really well for me I have lost 15 lbs since July and I actually feel the affects compared to the other companies I’ve tried Shop Genpeptide Read the full review on Genpeptide's page Discuss this review, share your own experiences, or ask questions about the vendor. Please keep discussions respectful and factual.

This is a vendor review submitted by samanthalorenzini on PeptideCritic.com. Rating: (5/5) Review Love the products. Tried different ones, you can see and feel the better quality compared to other companies. Fast shipping and zero issues! Shop Universal Biolabs Read the full review on Universal Biolabs' page Discuss this review, share your own experiences, or ask questions about the vendor. Please keep discussions respectful and factual.

This is a vendor review submitted by FitDad232 on PeptideCritic.com. Rating: (5/5) Review I started looking for a new vendor after realizing how much less other places were charging compared to what I’d been paying. I found Crush here on Peptide Critics and was still a little skeptical, but Rory, the owner at the time, had such a public presence that it made me feel more comfortable giving them a try. The first thing that stood out was how quickly my order arrived. I ordered on Labor Day Monday, and it was delivered Thursday morning. The packaging also made a great first impression. Everything looked clean and professionally branded, and the vials came in a little box with a protective plastic insert. That same attention to detail carried over to the vial labels. They included information from the COA, like the batch number, date, and purity, along with a barcode you can scan to view the actual COA directly on the lab’s website. Being able to easily pull up that information was reassuring. Overall, I’m really happy with my first purchase and would definitely recommend them based on my experience so far. Shop Crush Research Read the full review on Crush Research's page Discuss this review, share your own experiences, or ask questions about the vendor. Please keep discussions respectful and factual.

@russspencertiredlizardst I thought of that and tried that but that isn't the issue. It will not thread onto the bottle.