About

PeptideCritic is an independent vendor review directory and price comparison platform for research peptides. We aggregate live pricing, product verification data, and community-driven vendor reviews. Our mission is simple: no hype, no pay-to-play—just transparent data to help researchers find reliable suppliers.

Our rankings are earned, not bought. Vendor ratings are based entirely on verified user reviews and community feedback—we maintain a strict policy against paid vendor rankings. This community-driven approach functions as a watchdog, ensuring suppliers remain accountable through transparency and positive feedback.

Yes. The Price & Stock Tracking Dashboard and all core features are available at no cost to registered users. Simply create a free account to access your personalized dashboard, stock alerts, and all tracking features.

The Price & Stock Tracking Dashboard is a personalized tool that lets you monitor peptide prices and inventory from a single, centralized interface. Instead of manually checking vendor websites for restocks and price changes, our system puts that information directly in your dashboard with automated email alerts.

Add any product from the Peptide Pricing Index or any vendor from the Vendor Directory to your personal favorites list with a single click. Your dashboard then aggregates real-time pricing and availability data for all favorited items, displaying side-by-side comparisons across vendors.

Our stock alert system monitors inventory status and sends you email notifications the moment a tracked item returns to stock at your preferred vendors. You'll never miss an availability window again.

Yes! We recently added vial size sorting to the Peptide Pricing Index. No more clicking through dozens of product pages just to find the format you want—filter by your preferred vial size and see matching products instantly.

We use standardized price-per-unit (price-per-mg) tracking across all vendors, allowing you to make true apples-to-apples comparisons. This ensures you can identify the best value regardless of how different vendors package their products.

This indicates that the batch number is displayed directly on the product page—either in the listing text or visible in a product image. A COA link by itself does not count. We require the batch number to be readily visible so researchers can cross-reference it with any provided certificates of analysis.

Purity Verified means we've reviewed multiple batch COAs from that vendor and confirmed a consistent track record of ≥99% purity across products and batches. This isn't based on a single test—it reflects an ongoing pattern of quality documentation.

The Verified badge means we've confirmed through our own purchases and/or trusted community purchase reports that the vendor delivers a quality research product. This is hands-on validation, not just paperwork review.

Beyond price tracking and vendor reviews, we offer complementary tools including reconstitution calculators, a label maker for organizing your research materials, and an active community forum where users share experiences and insights.

Navigate to any vendor profile page and click the review button. Share your honest experience with product quality, shipping, customer service, and overall satisfaction. Your reviews help the community make informed decisions and keep vendors accountable.

Visit our Vendor Sign-up page and submit your application with your business details and website information. Our team reviews applications within 2-3 business days and verifies your business. Once approved, you'll access your vendor dashboard where you can add products and configure your settings.

Yes! If you already have a listing on PeptideCritic, you can claim ownership when you sign up. Register with your business email and we'll verify your ownership.

To become an Affiliate Partner, you need to offer at least a 10% commission on sales referred through PeptideCritic. If you already have an affiliate program, we can often work with your existing rates.

Absolutely. You can upgrade from Free to Affiliate (with approval) or from any tier to Premium at any time through your vendor dashboard.

Premium subscription covers dashboard features and priority placement. However, coupon code listings on the deals page still require an active affiliate relationship.

Sponsored placements are optional paid advertising opportunities (homepage banners, newsletter features, etc.) available exclusively to Premium Partners. They are not included in the base Premium subscription.

Premium subscriptions are billed monthly via Stripe. You can cancel anytime and your access continues until the end of the billing period.

Randy is our unofficial mascot—a distinguished research rat who takes his lab work very seriously. When he's not reviewing peptide purity data or checking COAs, you can find him advocating for transparent pricing in the peptide industry.

Aged Gruyère, obviously. Randy appreciates the complex flavor profile and the patience required for proper aging—much like he appreciates vendors who take the time to provide thorough documentation and consistent quality. He considers cheddar "entry-level" and refuses to discuss American cheese.