Is Peptide Sciences still in business?
No. The Peptide Sciences website went dark on March 6, 2026 and has not returned. The company has not announced any plans to relaunch.
Peptide Sciences Shut Down: Direct Answers
Short, sourced answers to the questions former Peptide Sciences customers are searching for in the days after the March 6, 2026 voluntary shutdown.
When did Peptide Sciences close?
Friday, March 6, 2026, at approximately 2:00 PM Eastern. There was no advance notice and no published wind-down period.
Did the FDA shut down Peptide Sciences?
Not directly. There is no public FDA enforcement action specifically naming Peptide Sciences. The shutdown was voluntary, but it followed more than 50 FDA warning letters issued to peer vendors and a June 2025 raid on Amino Asylum.
What happened to my pending Peptide Sciences order?
Pending orders were silently cancelled when the site went offline. Peptide Sciences has not published a refund process or order-status portal. Industry counsel has advised affected customers to document what they purchased, watch for fraudulent sites claiming to be Peptide Sciences under a new domain, and avoid sites asking for new payment information.
Are the new sites claiming to be Peptide Sciences real?
No. Multiple coverage sources have flagged scam domains that surfaced within days of the shutdown claiming to be Peptide Sciences under a new URL. There has been no official relaunch.
Where do former Peptide Sciences customers shop now?
Former customers have moved to U.S.-based research-supply vendors with public COAs and transparent business operations. Pure U.S. Peptides is one such option, focused on a 32-compound research catalog with public per-batch certificates and U.S. fulfillment.
Why did Peptide Sciences voluntarily close?
Industry coverage points to a combination of FDA warning letters across peer vendors, the January 2025 ITC General Exclusion Order blocking tirzepatide imports, deteriorating payment-processor classifications, and the proposed SAFE Drugs Act, which would have made the GLP-1 segment of the catalog explicitly illegal.
Sources
- Lumalex Law — Why Did Peptide Sciences Shut Down (March 13, 2026)
- PeptideLaws.com — Timeline & FDA Pressure
- Grips Intelligence e-commerce analytics — December 2025 sales estimate ($7.4M)
For a longer-form timeline, see our companion explainer: What Happened to Peptide Sciences. If you're looking for an alternative U.S.-based supplier, see our Peptide Sciences alternative page.
Looking for a research-only U.S. supplier?
Pure US Peptide carries 32 HPLC-verified research compounds with public per-batch COAs. Use code PSREFUGEE25 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 Peptide Sciences and is not affiliated with any third party named here. References are for context only.