Short version: Science.bio permanently closed on January 27, 2026. If you sourced research peptides there, the only thing that really changed is the bar for picking a replacement — the vendors still standing are the ones that publish independent, batch-level Certificates of Analysis (COAs). We build Life Link Research to clear that bar by a wide margin: every batch runs a six-test panel (identity, purity, residual solvents, heavy metals, endotoxin, sterility) verified by Janoshik Analytical, with the COA linked from each product page. Below: how to choose, how the surviving vendors compare, and how to move your research over.
Science.bio has closed — the 30-second status
Science.bio announced on January 27, 2026 that it would permanently close and discontinue all sales. It had been one of the larger research-chemical suppliers — known for a broad catalog spanning research peptides, SARMs, and nootropics — so its exit pushed a lot of laboratories to find a new source at once. It wasn’t an isolated event: the same window saw Amino Asylum (FDA enforcement, June 2025), Paradigm Peptides (criminal guilty plea, December 2025), and Peptide Sciences (March 2026) all close. For the full backstory, see what happened to Science.bio.
The thread connecting those closures: regulatory pressure landed hardest on vendors that drifted into human-use marketing or operated without verifiable third-party testing. The vendors still shipping in mid-2026 are, almost without exception, the ones who invested early in independent batch documentation and conservative, research-only positioning.
The one thing that changed about choosing a vendor
The bar is higher now, and the vendors who clear it are easy to identify once you know what to check. Before naming a replacement, here is the checklist we’d apply to any vendor — including ourselves:
- Batch-specific COA on every product page — visible and downloadable, not “available on request.”
- An independent analytical lab — Janoshik Analytical, Colmaric Analitika, or Auriga Research. A COA on the vendor’s own letterhead is not third-party testing.
- LCMS (mass spec) for identity, plus HPLC for purity. “99% pure” with no method named is a marketing number.
- A verifiable U.S. address — a real address, not just “Made in USA” copy.
- Sterility and endotoxin testing on injectable peptides — few vendors run these; the ones who do operate to a higher standard.
- Clear “for research use only — not for human consumption” labeling. Vendors that wink at human use are the ones drawing enforcement.
- Responsive support — email a question before you order and judge the reply.
Fail items 1–4 and you should not place an order. New to reading these documents? See how to read a peptide COA.
Our recommendation: Life Link Research
We’ll be direct, because it’s our site: for researchers who relied on Science.bio’s peptide range, we built Life Link Research to be the cleaner replacement on the one axis that matters most — verification. (Science.bio also carried SARMs and nootropics; we are peptide-focused, so this covers the research-peptide portion of what you sourced.)
- A six-test panel on every batch. Most peptide vendors run two tests (identity + purity). The most rigorous competitors run three or four. We run six: identity (LCMS), purity (RP-HPLC), residual solvents (GC), heavy metals (ICP-MS), endotoxin (LAL), and sterility — each result published on the batch COA.
- Independent verification by Janoshik Analytical, the most-cited third-party peptide lab in the industry.
- A full research range, including the GLP-1 family — Semaglutide, Tirzepatide, Retatrutide and CagriSema — alongside healing, longevity, and growth-hormone-secretagogue compounds.
- U.S. domestic stock, 2–4 day shipping, discreet packaging, and conservative, research-only copy.
Browse the full catalog
See our 6-test methodology
We’d rather you verify us than take our word for it. Open any product, confirm the COA is current and batch-numbered on our COA library, and order a single vial first to check the batch number on the vial against the page.
How the surviving vendors compare
The vendors below all meet the four critical criteria above, so any of them is a defensible choice. The column that separates them is how many tests each batch actually goes through. Data reflects publicly available information as of June 2026 — always confirm on the vendor’s current site before ordering.
| Vendor | Independent lab | COA per batch | Tests per batch | U.S.-based | GLP-1 range |
|---|---|---|---|---|---|
| Life Link Research | Janoshik | Yes | 6 (incl. sterility + endotoxin + heavy metals) | Yes | Full (incl. retatrutide, CagriSema) |
| Ascension Peptides | Janoshik | Yes | 2–3 | Yes | Strong |
| Core Peptides | Janoshik, Colmaric | Yes | 2 | Yes | Medium |
| Limitless Biotech | Independent | Yes | 2 | Yes | Wide |
| Felix Chemical Supply | Independent + sterility | Yes | 3–4 | Yes | Narrower |
| Swiss Chems | Independent (HPLC/MS) | Yes | 2 | Yes | Medium |
For a fuller breakdown of every vendor still operating, see our 2026 research-peptide vendor list, or the sister guide on Peptide Sciences alternatives.
Watch out for fake “Science.bio” sites
After a vendor of Science.bio’s size closes, look-alike domains tend to appear quickly — deceptive branding, near-identical URLs, and no analytical testing behind them. If you land on a site still taking orders under the Science.bio name after January 27, 2026, treat it as suspect. Buy only from a vendor whose COAs you can open, read, and trace to a named independent lab.
Moving your research over
Matching what you used to order to a verified equivalent is straightforward. A few of the research-peptide staples Science.bio customers carried over:
| What you sourced | Where to pick it up |
|---|---|
| GLP-1 weight-management peptides (semaglutide, tirzepatide, retatrutide, CagriSema) | Retatrutide, Tirzepatide, CagriSema |
| Healing & recovery (BPC-157, TB-500, GHK-Cu) | BPC-157 / TB-500 |
| Growth-hormone secretagogues (CJC-1295, Ipamorelin, Tesamorelin) | CJC-1295 / Ipamorelin |
| Longevity (NAD+, Epithalon, SS-31) | NAD+, Epithalon |
Already holding peptides bought from Science.bio before the closure? Lyophilized peptides in sealed vials at -20°C stay stable for roughly 24 months from manufacture for most sequences; reconstituted peptides at 2–8°C have a much shorter window. Keep the original COA if you have it. Details in our peptide storage guide.
Frequently asked questions
Is Science.bio still open?
No. Science.bio announced permanent closure on January 27, 2026 and discontinued all sales. Treat the domain as inactive — any site taking orders under that name afterward should be treated with caution.
What is the best Science.bio alternative?
For the research-peptide portion of Science.bio’s catalog: Life Link Research — a six-panel independent COA on every batch, the full GLP-1 range including retatrutide and CagriSema, and U.S. domestic shipping. Ascension, Core Peptides, and Felix Chemical also meet the core COA criteria.
Why did Science.bio close?
It closed amid the broader 2025–2026 regulatory tightening on research-chemical vendors. See what happened to Science.bio for the detail.
Did Science.bio sell SARMs and nootropics too?
Yes — its catalog was broader than peptides. Life Link Research is peptide-focused, so this guide covers the research-peptide portion of what you sourced, with a full batch COA on every product.
Are research peptides legal in the United States?
Yes — when sold and labeled strictly as research chemicals to qualified researchers, with no claims of human use and all required disclaimers. The 2025–2026 enforcement actions targeted vendors who marketed for human consumption.
All products referenced are intended strictly for laboratory research use and are not for human or veterinary consumption. Statements regarding peptides have not been evaluated by the U.S. Food and Drug Administration. Vendor and pricing information reflects publicly available data as of June 2026 and may change; verify the current status of any vendor before ordering.