Peptide Sciences Is Gone: Our Top 7 Alternatives
The closure of Peptide Sciences left a massive gap in the research peptide market. Here are the 7 best alternatives we've found for researchers who need a new reliable source.
What Happened to Peptide Sciences?
Peptide Sciences was widely regarded as the gold standard of research peptide vendors. Their rigorous quality control, comprehensive COA publishing, and extensive catalog made them the default recommendation for years. Their closure sent shockwaves through the research peptide community, leaving thousands of researchers scrambling for alternatives that could match their quality standards. The void they left highlighted just how much the community had come to depend on a single vendor — and why diversifying your vendor relationships matters. After extensive evaluation, here are our top 7 alternatives for researchers transitioning from Peptide Sciences.
1. Ascension Peptides — The Closest Match
If you valued Peptide Sciences primarily for their purity standards and COA transparency, Ascension Peptides is the closest replacement we've found. They match or exceed Peptide Sciences' purity benchmarks (99%+ HPLC across their catalog) and publish batch-specific third-party COAs in a similarly accessible format. The product range isn't quite as extensive as Peptide Sciences' was at their peak, but it covers all the major research peptides. Customer service is responsive and knowledgeable. The transition from Peptide Sciences to Ascension should feel natural for most researchers.
2. Swiss Chems — For Catalog Depth
If you relied on Peptide Sciences for their massive catalog — the ability to source dozens of different peptides from one vendor — Swiss Chems is your best bet. Their product range rivals what Peptide Sciences offered, covering everything from standard research peptides to less common compounds. Quality is consistent and well-documented. The website experience isn't as polished as Peptide Sciences' was, but the depth of inventory makes Swiss Chems the go-to for researchers who order multiple different peptides and prefer single-vendor simplicity.
3. Limitless Biotech — For Cutting-Edge Researchers
Peptide Sciences was often one of the first vendors to add newly characterized peptides to their catalog. If that forward-looking approach was important to your research, Limitless Biotech fills that niche. They prioritize stocking emerging compounds quickly while maintaining rigorous quality standards. The catalog is curated rather than comprehensive, focusing on compounds with genuine research interest rather than trying to list everything. Think of them as the innovation-forward successor to Peptide Sciences' exploratory spirit.
4. Core Peptides — For Budget-Conscious Labs
Peptide Sciences wasn't cheap, but their quality justified the price. If you're looking for a similar quality standard at a lower price point, Core Peptides offers the best value proposition in the post-Peptide Sciences landscape. They focus on the most-requested research peptides — the BPC-157s, TB-500s, and GH secretagogues that form the core of most research programs — and optimize their pricing through efficient supply chain management. You won't find exotic compounds here, but what they do carry is high quality at fair prices.
5. Sports Technology Labs — For Dual Testing Assurance
One of Peptide Sciences' hallmarks was rigorous testing. Sports Technology Labs takes this even further by running both HPLC and mass spectrometry on every product and publishing the results on product pages. If Peptide Sciences' testing rigor was what kept you coming back, STL's dual-testing protocol provides even greater analytical confidence. Their peptide catalog is still growing, but their quality assurance approach is best-in-class.
6. Apollo Peptide Sciences — For Institutional Research
If you ordered from Peptide Sciences for institutional or academic research and valued their professional documentation and handling, Apollo Peptide Sciences provides a similar premium experience. Their technical data sheets, cold-chain shipping options, and institutional purchasing support make them well-suited for formal research settings. Higher prices than average, but the documentation and professionalism justify the premium for institutional buyers.
7. Bioinfinity — The Future-Facing Choice
Bioinfinity represents what the next generation of peptide vendors looks like — built from the ground up with modern quality expectations, transparent practices, and pharmaceutical industry expertise. They're the newest option on this list, which means less track record, but everything about their approach suggests they're building for long-term reliability. For researchers willing to invest in a relationship with a vendor that's growing rapidly and committed to doing things right, Bioinfinity is worth consideration as a long-term Peptide Sciences replacement.
Research Disclaimer: All information on this page is provided for educational and research purposes only. Products discussed are intended for laboratory research use exclusively. They are not intended for human consumption, therapeutic use, or as dietary supplements. Always follow institutional guidelines and consult published peer-reviewed literature for research protocol development. Not for human consumption.