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Last updated: May 2026. Pure Chain Aminos (PCA) is a US-based, COA-backed research peptide vendor. This page summarizes publicly reported information about Science.bio’s January 2026 closure and provides a continuity option for displaced research customers.

The short version

Science.bio voluntarily shut down on January 27, 2026, citing “regulatory compliance” as the reason. Unlike Amino Asylum’s enforcement-driven exit seven months earlier, Science.bio’s closure was a planned wind-down announced by the company. There is no successor brand. The storefront is offline.

If you were a Science.bio customer, you are now in the same position thousands of others are: you need a new vendor for the same compounds, with the same documentation discipline, that you can trust will still be there next year. Pure Chain Aminos is offering displaced Science.bio customers 20% off their first order over $75 with code WELCOME20.

WELCOME20 — 20% off, $75 minimum. Shop the catalog.

Timeline of the closure

Per coverage at OptimalHRT (optimalhrt.com) and consistent reporting elsewhere, the timeline is:

The voluntary nature of the shutdown is a meaningful detail. Unlike a raid-driven closure (where the warehouse is sealed and customer service is unreachable), Science.bio went through a planned wind-down. That matters for what customers can recover.

What this means if you were a customer

Why customers are migrating to Pure Chain Aminos

Science.bio customers tended to be unusually documentation-conscious — they picked Science.bio precisely because of its COA discipline and its transparency about purity testing. PCA was built for the same buyer:

Top SKUs former Science.bio customers reorder first

Research resources

For background on the most-requested compounds: BPC-157, TB-500, GLP-3 Receptor, GLP-2-T, NAD+, MOTS-C, Retatrutide, plus the bacteriostatic water reconstitution guide.

How to switch over

  1. Pull your Science.bio order history from email — search “Science.bio order” — and list the SKUs you actually reorder.
  2. Match each one to the equivalent PCA SKU above (or browse the full catalog).
  3. Apply WELCOME20 at checkout for 20% off any order $75+.
  4. Save the COA PDF from each product page for your own records.

Ready to re-source? Use code WELCOME20 for 20% off orders $75+. Shop now.

See also

Frequently asked questions

Is Science.bio coming back?

The closure was announced as voluntary, citing regulatory compliance, and there is no public restart plan or successor brand. Treat the brand as closed for planning purposes.

Did everyone get refunded?

The wind-down published a refund process for orders that could not be fulfilled. If you have not received either shipment or refund, your card issuer\’s chargeback window is the next channel (commonly 60 to 120 days from the original transaction date).

What about my COA history?

The Science.bio COA archive is no longer publicly accessible. If you maintained downloaded copies in your email or local files, hold onto them. For new lots going forward, PCA publishes the COA on each product page at the time of stock arrival.

Is Pure Chain Aminos affiliated with Science.bio?

No. PCA is an independent US-based research peptide vendor. We are not a successor brand and have no operational relationship to Science.bio.

How does WELCOME20 work?

Apply WELCOME20 at checkout. 20% off orders with a $75 or larger subtotal. First-order discount for new customers; one redemption per customer.

How PCA documents each lot

Each lot of each SKU goes through third-party HPLC purity testing and mass-spec verification before release. The resulting COA PDF is published on the corresponding product page. When a new lot arrives, the COA link updates. Older lot COAs remain accessible by request to customer support so long-running protocols can document chain of custody across batches.


Sources cited: OptimalHRT — https://optimalhrt.com/science-bio-closed-2026-best-alternative/.

Research peptides for laboratory use only. Not approved by the FDA. Not for human consumption. By purchasing, you confirm you are a qualified researcher operating in a controlled laboratory setting.

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