The compounds referenced on this page are research-grade reference materials supplied strictly for in-vitro and laboratory research use only. They are not for human or animal consumption, are not drugs or supplements, and are not approved by the FDA for any therapeutic use. This page is a third-person sourcing and supplier-comparison guide for qualified researchers, not advice to take, dose, or administer any substance. It notes, in neutral terms, the closure of Science.bio and the standards a laboratory should require from a replacement source.
What Happened to Science.bio
Science.bio was a well-known research-compound source whose closure in 2026 removed another established option from the market, with some of its inventory reported to have moved to other sellers. As with the other closures of this period, the result is a pool of brand and product searches that no longer has a home and a set of laboratories that need a documented replacement.
When inventory changes hands between sellers, lot documentation becomes even more important. A researcher cannot assume that a compound carried by a new seller meets the same standard as before, so the evaluation should return to first principles: independent testing, a stated purity benchmark, and verifiable provenance for the specific lot.
What Researchers Actually Need From a Replacement Supplier
When a long-standing supplier closes, the practical question for a laboratory is not which brand name to chant but which verifiable standards to require. A research-peptide supplier is a documentation business as much as a chemistry one. The materials are only as useful as the proof that accompanies them, so the evaluation should start with evidence, not marketing.
Five criteria separate a serious source from a placeholder: independent third-party analysis on every lot, a stated and consistent purity standard, a catalog deep enough to cover a research program, transparent and stable pricing, and disciplined research-use-only compliance. A supplier that is strong on documentation but thin on catalog is still workable; a supplier that is loud on claims but silent on lab proof is not.
- Independent (third-party) Certificate of Analysis tied to the specific lot, ideally with HPLC and mass-spec data
- A clear purity standard stated up front (the common research benchmark is 99 percent or higher)
- Catalog breadth across the compound classes a program actually studies, not just the three best-known peptides
- Transparent, stable pricing that can be budgeted against, rather than rotating coupon theater
- Consistent research-use-only framing and a clear seller of record, which signals the supplier intends to stay compliant and stay open
Purity and Certificates of Analysis: The Part That Actually Matters
The single most important difference between suppliers is not price, it is whether an independent laboratory has verified what is in the vial. A Certificate of Analysis, or COA, is the document that reports identity and purity for a given lot. The phrase to look for is independent or third-party, because an in-house number that no outside lab has confirmed is a claim, not a verification.
A useful COA names the testing method (high-performance liquid chromatography for purity, mass spectrometry for identity), references the lot it describes, and is available for the material a researcher is actually buying. Peptides Factory Direct tests to a 99 percent or higher purity target and makes a Certificate of Analysis available; researchers evaluating any source should ask for the same and refuse to treat email-us-later as a substitute for paperwork.
Catalog Depth and Compound Coverage
A replacement source should cover the compound classes a program studies rather than only the headline peptides. That means metabolic and incretin research peptides, growth-hormone-axis secretagogues, tissue-repair and recovery peptides, longevity and mitochondrial compounds, cognitive and neuro peptides, and the melanocortin and reproductive-axis families.
The Peptides Factory Direct research reference library documents the compounds it carries with mechanism, handling, and reconstitution notes, and the catalog is organized by [research category](/) so a lab can find a class quickly. Breadth matters because consolidating lots with one well-documented source is easier to audit than scattering orders across several thin shops.
Pricing You Can Budget Against
Research budgets are planned, so price stability is part of supplier quality. A source that publishes per-vial pricing and holds a consistent position against the market is easier to plan around than one that swings between inflated list prices and flash discounts. Peptides Factory Direct prices each item against current market data and publishes a cost and pricing reference so the number is legible.
Lowest sticker price is not the same as best value. A slightly higher price attached to an independent COA, a stated purity standard, and reliable fulfillment is usually the cheaper choice once a failed or undocumented lot is counted. The supplier comparison guide walks through how to weigh price against documentation.
Compliance, Shipping, and Why It Predicts Whether a Supplier Stays Open
The supplier closures of 2025 and 2026 share a theme: sources that blurred the line between research material and consumer product drew regulatory attention, while sources that kept disciplined research-use-only framing were better positioned to keep operating. Compliance is therefore not boilerplate, it is a predictor of whether a supplier will still be there for the next lot.
Practical signals of a durable source include a clear seller of record, consistent not-for-human-or-animal-consumption language, age verification, and lyophilized (powder) materials shipped for refrigerated storage and laboratory reconstitution. Peptides Factory Direct ships nationwide to all 50 states with these standards and routes research questions through its questions and answers library and ordering through the order portal.
Where Peptides Factory Direct Fits
Peptides Factory Direct answers the documentation question directly: a 99 percent or higher purity target, an independent Certificate of Analysis available on request, transparent cost and pricing, and a catalog organized by [research category](/) with a supporting reference library. It is built to be audited rather than taken on faith.
A replacement source chosen on standards rather than on whichever brand ranks first is a more durable decision. Laboratories can hold Peptides Factory Direct to the same five criteria as any supplier, review the supplier comparison, and order through the order portal.
Create a free research account to view current pricing and bundles and place an order.
Frequently asked questions
Did Science.bio shut down?
Science.bio closed in 2026, with some inventory reported to have moved to other sellers. Because compounds changing hands between sellers cannot be assumed to meet the prior standard, laboratories should require lot-specific independent testing and a stated purity benchmark from any replacement source.
Is this an endorsement to consume any peptide?
No. Every compound referenced here is a research-grade reference material for laboratory and in-vitro use only. Nothing on this page is medical advice or instruction to take, dose, or administer any substance. It is a supplier-comparison guide for qualified researchers.
What is the most important thing to check in a replacement supplier?
Independent, lot-specific third-party testing. A Certificate of Analysis from an outside laboratory that names the method and references the lot is the difference between a verified material and an unverified claim. Treat email-us-for-a-COA as a red flag and ask for documentation before ordering.
Does a lower price mean a better source?
Not by itself. The cheaper choice is the one that arrives documented, at the stated purity, and on time. A modestly higher price attached to an independent COA and reliable fulfillment usually costs less than a cheap, undocumented lot once a failed batch is counted.
All guides · Order research peptides
External references: U.S. Food and Drug Administration · Peptide (Wikipedia)