Science.bio Alternative — Pure U.S. Peptides

What happened to Science.bio

On January 27, 2026, Science.bio announced its permanent closure in a customer email and a Facebook post (post ID 951466978871034). The company served the longevity, nootropic, and biohacking research community for several years and was widely cited in community discussions as a reference vendor for compound purity and breadth of catalog. Coverage of the announcement appeared in the Rapamycin News forum thread "Science.bio closes", where former customers documented the closure email and discussed migration paths.

The closure was orderly: Science.bio honored outstanding store credit and pending orders at the time of the announcement, and the homepage continues to serve a closure banner directing former customers to support resources. Science.bio did not publish a successor entity or relaunch domain. Forum discussion suggests the closure followed the broader regulatory tightening across the U.S. research-peptide segment that has played out across 2024–2026, though Science.bio did not cite a single named cause in its public statement.

The Science.bio audience skewed heavily toward the longevity and nootropics research community: subscribers to the Rapamycin News forum, the r/longevity and r/Nootropics communities, and independent investigators studying mitochondrial peptides, NAD+ precursors, and selective nootropic peptides. That audience is now searching for a replacement vendor with comparable catalog coverage and clean operating posture.

Why researchers chose Science.bio

Science.bio earned its reputation on three things: a wide longevity-focused catalog (MOTS-c, NAD+, Epitalon, GHK-Cu, BPC-157, TB-500, the Selank/Semax nootropic pair), per-mg pricing transparency that let researchers compare vendors directly, and clean compliance language that did not market therapeutic outcomes. The community trusted the brand because it operated with restraint at a time when many competing vendors were aggressively marketing GLP-1 weight-loss compounds and drawing FDA attention.

That posture is what former Science.bio customers are now looking to replicate. The replacement question is not just "who carries the same compounds?" — it's "who carries them with the same operating posture, public COAs, and U.S.-based fulfillment?"

What Pure U.S. Peptide offers (vs Science.bio's strengths)

Pure US Peptide is built for the same research audience. Where Science.bio had a roughly 120-compound catalog, we carry a deliberately tighter 32-compound research catalog focused on the workhorse molecules with deeper published literature. The trade-off: less breadth, more depth per compound (gold-standard research summaries, mechanism-of-action writeups, PubMed-linked citations on each product page).

On the operational side, every Pure US Peptide product page lists the lot-specific certificate of analysis from an independent U.S. lab — public, per batch, no email request required. Science.bio published COAs on request; we publish them on the page. Orders ship same-day from a U.S. fulfillment warehouse. We accept card payments via PSiFi, Zelle, Venmo, and Cash App — no crypto-only checkout.

Top compounds Science.bio carried — and our equivalents

Below is a mapping of the most-requested Science.bio compounds to our research catalog. All equivalents are research-only molecules supplied at 99%+ HPLC purity with public per-batch COAs.

• MOTS-c — mitochondrial-derived peptide, central to longevity research. MOTS-c at Pure US Peptide.
• NAD+ — nicotinamide adenine dinucleotide, mitochondrial cofactor for longevity research. NAD+ at Pure US Peptide.
• BPC-157 — connective-tissue research workhorse. BPC-157 at Pure US Peptide.
• TB-500 — actin-binding research peptide. TB-500 at Pure US Peptide.
• Selank — selective nootropic research peptide. Selank at Pure US Peptide.
• Semax — nootropic research peptide. Semax at Pure US Peptide.
• Epitalon — telomere-related longevity research compound. Not currently in our 32-compound catalog. We focus on compounds with deeper published research.

Switching guide for former Science.bio customers

If you were a regular Science.bio customer, the migration path is straightforward:

1. Document your prior catalog. Make a list of the compounds you regularly ordered from Science.bio. The longevity research community typically anchors on three to five compounds — MOTS-c, NAD+, and one or two of BPC-157 / TB-500 / Selank / Semax.
2. Cross-reference our catalog. Each compound on our product list lists the lot-specific COA, mass spec data, mechanism-of-action writeup, and PubMed citations. Pull the COA and verify lot purity before you commit to a first order.
3. Run a small first-batch validation. Place a small order using code SBREFUGEE25 (20% off the first order) to validate purity and shipping speed against your Science.bio baseline. Most former customers re-order within 30 days.
4. Bookmark the closure timeline. If you encounter a domain claiming to be Science.bio under a new URL, check our companion explainer at /what-happened-to-science-bio and the source links there. Science.bio has not announced a relaunch.