- The PeptidePrices browser extension is free and, on our partner vendors' sites, automatically applies the best coupon code we have for that store at checkout, so you stop leaving discounts on the table.
- It only wakes up on PeptidePrices partner vendor domains. It does not read your browsing history, collect personal data, or track you across the web.
- It does not invent discounts. It applies the same codes we already publish on our coupon pages, and it credits PeptidePrices for the referral, which is how the site stays free. Our vendor ratings are set by an independent rubric and are never affected by any partner relationship.
- Available now for Chrome and Edge. Install it from the Chrome Web Store, or read more on our extension page.
We built PeptidePrices to answer one question honestly: where is the best price on a given research peptide, and can you trust the vendor selling it? Over time that grew into live price comparisons across dozens of vendors, a published quality rubric, COA verification tools, and a set of negotiated partner coupon codes that knock real money off your order.
There was still one gap. Even when we listed a working discount code, you had to remember it, copy it, and paste it into the right field at checkout before it expired from your memory. Plenty of people simply forgot, and paid more than they needed to.
The new PeptidePrices browser extension closes that gap. It is free, it is available now for Chrome and Edge, and its entire job is to make sure you never miss a coupon on a partner vendor again.
What it does
Install the extension and shop like you normally would. When you land on one of our partner vendors' sites, a small PeptidePrices badge appears to let you know we have that store covered. When you reach checkout, the extension applies the best coupon code we have for that vendor automatically. No hunting through our site, no copy-pasting, no "code expired" surprises.
That is the whole product. It is deliberately narrow. It does one useful thing and does it well.
How it works
Under the hood the extension does three simple things, and only on our partner vendors' domains:
- Shows a badge so you know a PeptidePrices deal is available on the store you are visiting.
- Applies the coupon at checkout, choosing the best code we have negotiated for that vendor.
- Credits PeptidePrices for the referral once per session, which is the affiliate relationship that keeps the whole site free to use.
On any site that is not a partner vendor, the extension stays completely dormant. It does not run, does not show anything, and does not watch what you are doing.
Your privacy comes first
This matters, so we want to be direct about it. The extension does not collect your personal data, it does not read your browsing history, and it does not track you across the web. There is no account to create and nothing to log in to.
It activates only on the specific list of partner vendor domains it ships with, where the task is unambiguous: apply the right code and attribute the referral. That is a much smaller and more honest footprint than the typical "coupon" or "shopping" extension, many of which quietly monetize your entire browsing history. We do not do that, and we never will.
The honest part: how this is paid for
We are an affiliate-supported site, and we have always said so plainly on our trust page and in our footer. When you buy through one of our partner links or with one of our codes, the vendor pays us a commission at no extra cost to you. The extension uses that same model: it applies a code that saves you money and credits us for sending you there.
Two things we want to be equally clear about:
- The extension does not invent discounts or inflate prices. It applies the exact codes we already publish on our coupon pages. If a partner does not offer a public code, there is nothing to apply, and the extension will not pretend otherwise.
- It has no effect on our ratings. Vendor quality scores come from our published rubric, and affiliate status carries zero weight in that math. Automating a coupon at checkout does not, and cannot, change how a vendor is scored.
Where it works
Right now the extension covers our affiliate partner vendors, more than two dozen research-peptide stores and growing. Every time we add a new partner to the site, the extension picks them up automatically, so the coverage only expands from here.
How to install it
Grab it from the Chrome Web Store and click Add to Chrome. It works in Microsoft Edge too. Once it is installed, there is nothing to configure. Shop a partner vendor, and the code is handled for you.
You can also read the full rundown on our extension page.
As always, everything on PeptidePrices, including this extension, is for research-use context only. Compounds sold by the vendors we track are research materials, not products for human consumption. We compare prices and verify COAs. What you do with that information is up to you.