MOTS-c
Mitochondrial-derived peptide. Central to longevity and metabolic-research catalogs at Science.bio.
View MOTS-c at Pure US Peptide →Science.bio Shut Down — Where to Buy Now
Science.bio announced its permanent closure on January 27, 2026. If you're looking for a U.S.-based research-only supplier for MOTS-c, NAD+, BPC-157, TB-500, Selank, or Semax, here are the direct swaps and a 20% first-order code.
Shop with code SBREFUGEE25 →20% off your first order — applied automatically.
Top SKU swaps from Science.bio
NAD+
Nicotinamide adenine dinucleotide. NAD+ precursor research was a top Science.bio segment.
View NAD+ at Pure US Peptide →BPC-157
Connective-tissue research workhorse. One of the most-ordered Science.bio compounds.
View BPC-157 at Pure US Peptide →TB-500
Actin-binding research peptide. Frequently paired with BPC-157 in connective-tissue research.
View TB-500 at Pure US Peptide →Selank + Semax
Nootropic research peptide pair. Heavily represented in the r/Nootropics community Science.bio served.
View Selank at Pure US Peptide →Buyer-intent context: what former Science.bio customers should know first
Three things matter most when picking a replacement vendor in the days after the January 27, 2026 closure: (1) does the vendor carry the specific compounds you were ordering, (2) are the per-batch certificates of analysis published or only on request, and (3) does the vendor ship from a U.S. fulfillment warehouse with no international import or customs steps. Pure US Peptide is a yes on all three for the workhorse longevity research compounds and the Selank/Semax nootropic pair Science.bio served.
What changed for Science.bio customers
Science.bio published an orderly closure: outstanding store credit was honored during the announced wind-down, pending orders were fulfilled or refunded, and the homepage was replaced with a closure banner rather than going dark. For active researchers, the immediate question is supply continuity — most longevity research projects depend on a small set of compounds (MOTS-c, NAD+, plus one or two of BPC-157 / TB-500 / Selank / Semax), and any interruption disrupts the research timeline.
Pure US Peptide carries the workhorse Science.bio compounds at 99%+ HPLC purity with public per-batch COAs. Same-day U.S. fulfillment, card / Zelle / Venmo / Cash App payment, and research-only positioning across every product page. For a longer-form closure timeline and primary sources, see our companion explainer at /what-happened-to-science-bio.
Quick answers
Is Science.bio still in business?
No. Science.bio announced its permanent closure on January 27, 2026 in a Facebook post (ID 951466978871034) and customer email. The site continues to serve a closure banner. No relaunch has been announced.
When did Science.bio shut down?
The closure announcement was published on January 27, 2026. A wind-down window followed for store credit and pending orders.
Did the FDA shut down Science.bio?
There is no public FDA enforcement action specifically naming Science.bio. The closure was voluntary and orderly: Science.bio honored outstanding store credit and pending orders during the announced wind-down.
Where do I buy MOTS-c, NAD+, BPC-157, TB-500, Selank, or Semax now?
Pure US Peptide carries all six of these compounds. Each product page lists the lot-specific certificate of analysis from an independent U.S. lab, plus PubMed-linked research citations.
Is the new site claiming to be Science.bio real?
Treat any new domain claiming to be Science.bio as unverified. Science.bio has not announced a successor entity or relaunch.
Do you carry Epitalon?
Epitalon is not currently in our 32-compound research catalog. We focus on compounds with deeper published research literature.
Why these specific swaps
The five swaps above cover the bulk of the Science.bio research catalog by order volume. MOTS-c and NAD+ together accounted for the longevity-segment workload of most Science.bio customers — both are central to mitochondrial-function research literature. BPC-157 and TB-500 together cover the connective-tissue research segment that Science.bio also served heavily. Selank and Semax cover the nootropic research segment that overlapped with the r/Nootropics community Science.bio engaged with directly.
Each compound at Pure US Peptide is supplied at 99%+ HPLC purity with the lot-specific certificate of analysis published on the product page. You can validate a first batch against your prior Science.bio purity baseline before committing to a recurring supply. That side-by-side validation is the standard migration step former Science.bio customers are running before consolidating their replacement vendor.
Primary sources
Looking for a research-only U.S. supplier?
Pure US Peptide carries 32 HPLC-verified research compounds with public per-batch COAs. 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. Pure U.S. Peptides has no business relationship with Science.bio and is not affiliated with any third party named here. References are for context only. Science.bio does not endorse Pure U.S. Peptides.