When Peptide Sciences shut down, it left a lot of researchers scrambling. They had been one of the most trusted names in research peptides for years, known for consistent quality and detailed certificates of analysis. If you relied on them for compounds like Semaglutide, Tirzepatide, or BPC-157, you probably spent some time wondering where to go next.
The good news: the market has matured since then. Several vendors have stepped up with strong quality standards, third-party testing, and reliable availability. Here are the alternatives worth considering.
Ignite Peptides
Ignite Peptides has become one of the more popular replacements for Peptide Sciences, and for good reason. They carry a wide catalog that covers most of what researchers previously sourced from Peptide Sciences, including Semaglutide, Tirzepatide, Retatrutide, BPC-157, TB-500, and GHK-Cu.
Every batch is third-party tested and they publish certificates of analysis for each product. They are a verified US-based vendor with a reputation for fast shipping and responsive customer support. If you want a single vendor that can cover most of your research needs, Ignite is a solid starting point.
Swiss Chems
Swiss Chems is one of the longest-running vendors in the research chemical space. Their peptide catalog is extensive, covering everything from metabolic peptides to regenerative compounds and growth hormone secretagogues. They stock BPC-157, TB-500, Ipamorelin, Tesamorelin, CJC-1295, Epithalon, PT-141, Melanotan II, MOTS-C, and GHK-Cu, among many others.
Swiss Chems is a verified vendor with third-party testing on all products. Their years in the market give them supply chain stability that newer vendors sometimes lack. For researchers who need a broad catalog with consistent stock, they are a reliable option.
Apollo Peptide Sciences
Apollo Peptide Sciences picked up where the original Peptide Sciences left off (no relation, but the parallel is hard to miss). They are a verified, US-based vendor offering third-party tested research peptides including Semaglutide, Tirzepatide, Retatrutide, BPC-157, TB-500, GHK-Cu, and Epithalon.
Their testing documentation is thorough, with batch-specific certificates of analysis available for each product. Apollo positions itself as a premium option, and their quality control reflects that.
Ascension Peptides
Ascension Peptides offers one of the widest selections of any vendor on the market. Their catalog includes harder-to-find compounds alongside the staples, stocking everything from 5-Amino-1MQ and AOD-9604 to Semaglutide, Retatrutide, Tirzepatide, and Cagrilintide.
They are a verified vendor with third-party testing across their full product line. If your research requires niche or newer compounds that other vendors don't carry, Ascension is worth checking.
Royal Peptides
Royal Peptides focuses on newer metabolic research compounds. Their catalog leans into the GLP-1 space with Retatrutide, Tirzepatide, Semaglutide, and Cagrilintide, along with other compounds like Pinealon and 5-Amino-1MQ.
All products are third-party tested. Royal Peptides is a good option for researchers specifically focused on metabolic and next-generation peptides.
PepVida
PepVida is a Canadian vendor offering third-party tested research peptides. Their catalog includes Retatrutide, Tesamorelin, MOTS-C, GHK-Cu, and Glutathione. Prices are listed in CAD.
For researchers based in Canada or those who prefer a Canadian supplier, PepVida fills a geographic gap that most US-based vendors leave open.
What to look for in a Peptide Sciences replacement
Not all vendors are equal, and the post-Peptide Sciences market includes some low-quality options alongside the legitimate ones. Here is what matters when evaluating alternatives:
Third-party testing. Every reputable vendor should provide certificates of analysis from independent labs. Look for HPLC purity data, mass spectrometry confirmation, and endotoxin testing. If a vendor can't show you a COA for a specific batch, move on.
Verified operations. Vendors with verifiable business addresses, responsive support teams, and transparent practices are less likely to disappoint. Anonymous or offshore operations with no clear accountability are a risk.
Catalog depth vs. specialization. Some vendors try to stock everything, while others specialize. Both approaches can work. What matters is whether they can reliably supply the specific compounds your research requires without frequent stockouts.
Community reputation. Researcher forums and review communities discuss vendor quality openly. These discussions are anecdotal, but patterns emerge quickly. A vendor with consistently positive feedback across multiple independent sources is generally a safer bet.
Moving forward after Peptide Sciences
The closure of Peptide Sciences was disruptive, but the market adapted. The vendors listed above all provide third-party tested research peptides with legitimate operations. Several of them have filled the quality gap that Peptide Sciences left behind.
The best approach is to establish relationships with two or three trusted vendors rather than relying on a single source. This protects against supply disruptions and gives you options when specific compounds go out of stock.
Compare vendors side by side across our full peptide directory, or explore peptides to find exactly which compounds each vendor carries.