FeelPure Peptides vs. Peptide Sciences vs. Core Peptides: Which Supplier Is Actually Worth Trusting?
We compared three of the most searched peptide suppliers head-to-head on purity, COA transparency, pricing, and reliability. One brand has shut down entirely. Here is what you need to know before you buy.
The research peptide market has exploded in the past three years. BPC-157, TB-500, Semaglutide, and dozens of other compounds have gone from obscure laboratory reagents to some of the most searched wellness topics on the internet. And with that surge in demand has come an equally explosive surge in suppliers — ranging from genuinely rigorous operations to outright fraud.
Three names consistently appear at the top of search results when researchers go looking for a trusted source: FeelPure Peptides, Peptide Sciences, and Core Peptides. But the landscape has changed dramatically. Peptide Sciences, once one of the most respected names in the space, has permanently shut down — and their own website now warns that any site claiming to be them or sell their products is fraudulent. That leaves FeelPure Peptides and Core Peptides as the two active players worth comparing.
This article gives you the full picture: what each supplier actually offers, how their quality control stacks up, what their pricing looks like, and which one you should trust with your research budget.
The background
Peptides are short chains of amino acids that serve as signaling molecules in the body. Research compounds like BPC-157 (Body Protection Compound 157) and TB-500 (Thymosin Beta-4) have attracted enormous interest for their potential roles in tissue repair, inflammation modulation, and recovery. Because these compounds are sold strictly for research purposes and not for human consumption, the regulatory landscape is complex — and quality control varies wildly between suppliers.
The critical differentiator between a trustworthy peptide supplier and a dangerous one is third-party testing. A legitimate supplier will provide a Certificate of Analysis (COA) from an independent laboratory confirming the identity, purity, and concentration of every batch. Without a COA, there is no way to verify that what is in the vial matches what is on the label. Underdosed or contaminated peptides are not just a waste of money — they can actively compromise research integrity and pose health risks.
What it actually is
**FeelPure Peptides** is a USA-based research peptide supplier operating at feelpurepeptides.com. The brand positions itself around pharmaceutical-grade purity, rigorous third-party COA verification for every batch, and a curated catalogue of the most in-demand research compounds including BPC-157, TB-500, Semaglutide, Tirzepatide, and GHK-Cu. Their entire brand identity is built on the premise that purity documentation should be non-negotiable.
**Peptide Sciences** was formerly one of the most trusted names in the research peptide industry. As of 2025, the company has voluntarily shut down all operations and discontinued the sale of all research products. Their official website explicitly states: "Any website, entity, or individuals claiming to be Peptide Sciences, a successor to Peptide Sciences, or falsely claiming to sell our products are fraudulent, unauthorized, and have absolutely no affiliation with our company." If you encounter any site selling "Peptide Sciences" products, it is a scam — full stop.
**Core Peptides** is an active USA-based supplier at corepeptides.com offering over 103 compounds and peptide blends. They manufacture in cGMP-certified facilities, ship domestically with free delivery on orders over $200, and maintain an active product catalogue. Their branding emphasizes quality control and scientific formulation.
What works
FeelPure leads on COA transparency with batch-specific third-party lab results. Core Peptides offers 103 compounds from cGMP facilities. Both ship within the USA with competitive pricing on BPC-157 and TB-500.
What does not
Core Peptides does not prominently display individual product COAs on each product page. Peptide Sciences is permanently shut down — any site claiming to sell their products is fraudulent.
What it costs
FeelPure BPC-157 5mg: ~$55. Core Peptides BPC-157 5mg: $52. Peptide Sciences: discontinued.
The verdict
FeelPure Peptides is the clear winner for researchers who prioritize verified purity and transparent third-party testing. Core Peptides is a legitimate alternative with a broader catalogue. Avoid any site claiming to be Peptide Sciences — the company has permanently shut down and all such sites are fraudulent.
What works
- FeelPure publishes batch-specific third-party COAs for every product
- Core Peptides offers 103 compounds from cGMP-certified facilities
- Both suppliers ship domestically within the USA
- Pricing is competitive and closely matched between the two active suppliers
- FeelPure curates the highest-demand compounds with maximum purity documentation
What does not
- Core Peptides does not prominently display per-product COAs on product pages
- Peptide Sciences has permanently shut down — any site claiming to be them is a scam
- Broad catalogue at Core Peptides means quality control processes are harder to verify across all 103 SKUs
- Research peptides are sold for research use only — not for human consumption
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