MOTS-c
Mitochondrial-derived peptide, central to the longevity and metabolic research literature.
View MOTS-c at Pure US Peptide →Science.bio Shut Down — Where to Buy Now
Science.bio announced its permanent closure in January 2026. If you need a U.S. research-only supplier for MOTS-c, NAD+, BPC-157, TB-500, Selank, Semax or Epithalon, here are the direct swaps — and what the company itself actually said.
Domain status independently checked and page reviewed July 31, 2026.
Shop with code SBREFUGEE25 →20% off your first order — applied automatically.
What science.bio serves today
We requested the site on July 31, 2026. It returns a single page titled “Science Bio — Permanently Closed”, carrying this notice:
“After careful consideration, Science.bio has made the decision to permanently close and discontinue the sale of research products.”
The notice carries no closure date and no stated reason. It also includes an explicit impersonation warning:
“Any website, entity, or individuals claiming to be Science.bio, a successor to Science.bio, or falsely claiming to sell our products are fraudulent, unauthorized, and have absolutely no affiliation with our company. Do not interact with them and report them to us immediately.”
Top SKU swaps from Science.bio
NAD+
Nicotinamide adenine dinucleotide — the anchor of most NAD+ precursor research programmes.
View NAD+ at Pure US Peptide →BPC-157
Connective-tissue research workhorse, and one of the most widely ordered research peptides generally.
View BPC-157 at Pure US Peptide →TB-500
Actin-binding research peptide, frequently paired with BPC-157 in connective-tissue work.
View TB-500 at Pure US Peptide →Selank + Semax
The nootropic research pair, heavily represented in the communities Science.bio served.
View Selank at Pure US Peptide →Epithalon
Also written Epitalon or Epithalone — the AEDG tetrapeptide studied in the telomerase and geroprotector literature.
View Epithalon at Pure US Peptide →What to check before picking a replacement
Three questions decide most of it. Does the vendor carry the specific compounds you were actually ordering? Is the per-batch certificate of analysis published on the product page, or only produced on request? And does it ship domestically, without an import step? Those are answerable before you spend anything, and they filter the field quickly.
Pure U.S. Peptides is a yes on all three for the compounds listed above. For a longer-form closure timeline and the primary sources, see our companion explainer at what happened to Science.bio.
Quick answers
Is Science.bio still in business?
No. science.bio now serves a page titled “Science Bio — Permanently Closed” carrying a notice from the company: “After careful consideration, Science.bio has made the decision to permanently close and discontinue the sale of research products.” That notice was still live when we checked on July 31, 2026.
When did Science.bio shut down?
The closure was announced on January 27, 2026. The notice on science.bio itself carries no date; the date comes from the customer email sent that day, which community members archived and discussed in a forum thread the same afternoon.
Why did Science.bio close?
The live notice gives no reason at all — it says only that the decision followed “careful consideration.” Customers who received the closure email quote it as citing regulatory compliance. We could not independently verify the email text, so we present that as a report rather than as established fact.
Did the FDA shut down Science.bio?
We are not going to assert or deny that. Science.bio’s own notice describes a decision the company made, not an action taken against it, and we found no verified public record of an enforcement action. If you want to check the record rather than rely on any summary of it, the FDA publishes warning letters and enforcement actions at fda.gov.
What happened to pending orders and refunds?
The closure email, as quoted by customers who received it, said: “All outstanding orders will be either fulfilled or fully refunded.” We cannot see another company’s order system and cannot confirm how any individual case was resolved. The notice on science.bio lists a customer support address; if you paid by card and cannot get a response, your card issuer’s dispute process is time-limited.
Is a new site claiming to be Science.bio real?
According to Science.bio, no. Its notice states: “Any website, entity, or individuals claiming to be Science.bio, a successor to Science.bio, or falsely claiming to sell our products are fraudulent, unauthorized, and have absolutely no affiliation with our company. Do not interact with them and report them to us immediately.”
Do you carry Epitalon?
Yes. It appears in our catalog under the spelling Epithalon (also written Epitalon or Epithalone) — the AEDG tetrapeptide. It has a product page with a lot-specific certificate of analysis published on it.
Why these specific swaps
The compounds above cover the segments Science.bio was best known for: MOTS-c and NAD+ for mitochondrial and longevity work, BPC-157 and TB-500 for connective-tissue research, Selank and Semax for the nootropic literature, and Epithalon for the geroprotector and telomerase literature. Where a lot-specific certificate of analysis has been published, it sits on the product page itself, so you can validate a first batch against your previous purity baseline before moving a recurring supply across; where one is still pending, the page says so instead. That side-by-side check is the sensible migration step, and it is worth doing regardless of which vendor you pick.
Sources
- science.bio — the company's own closure notice, retrieved July 31, 2026.
- Rapamycin News forum thread — “Science.bio closes,” opened January 27, 2026, where customers archived the closure email.
- FDA warning letter database — search the enforcement record directly.
Looking for a research-only U.S. supplier?
Pure U.S. Peptides publishes the lot-specific certificate of analysis on the product page itself for 37 of its 53 listings, and fulfils from the U.S. Use code SBREFUGEE25 for 20% off your first order.
Browse the catalog →Research Use Only. All compounds sold by Pure U.S. Peptides are intended exclusively for in-vitro research and laboratory use by qualified investigators. They are not intended for human or veterinary consumption.
Educational content. This page reports publicly available information and quotes the named company's own published notice. It does not allege wrongdoing by any company or individual. Pure U.S. Peptides has no business relationship with Science.bio, is not affiliated with any third party named here, and is not a successor to Science.bio. We do not sell Science.bio products and have never claimed any connection to that company. Science.bio does not endorse Pure U.S. Peptides. If you believe something on this page is inaccurate, contact us and we will correct it.