Last updated: August 2026.
Processing Time
Orders are processed and shipped within 48 hours of payment confirmation. Our daily order cutoff is 4:00 PM Central Time — orders confirmed after the cutoff, on weekends, or on holidays begin processing the next business day. You will receive a tracking number by email once your label has been created.
Domestic Shipping (United States)
Sisu Research Supply ships to all 50 U.S. states via USPS, UPS, and FedEx. Delivery times vary by carrier and destination but typically range from 2–5 business days after processing. Expedited shipping is available at checkout.
Free Shipping
All domestic orders of $250 or more qualify for free standard shipping. Orders under $250 ship at the flat standard rate shown at checkout. Free shipping is applied automatically when your subtotal meets the threshold.
Packaging
All orders are shipped in discreet, unmarked packaging with no indication of the contents on the exterior. Research peptides are packed securely to prevent transit damage. Temperature-sensitive products include appropriate cold-chain packaging where applicable.
Tracking
Tracking information is provided by email once your shipping label is created. If you have not received tracking within 2 business days of ordering, contact info@sisuresearchsupply.com with your order number.
Address Accuracy
It is your responsibility to provide a complete and accurate shipping address at checkout. Sisu Research Supply is not liable for delays, losses, or non-delivery caused by an incorrect or incomplete address. Packages returned as undeliverable due to address errors may be reshipped at the customer's expense. No refunds are issued for undeliverable packages.
Carrier Delays
Once a package is in the possession of the carrier, delivery timelines are outside our control. Sisu Research Supply is not responsible for carrier delays, weather-related disruptions, or customs holds. We are not able to issue refunds for carrier delays.
Lost or Stolen Packages
Sisu Research Supply is not responsible for packages marked as delivered by the carrier. If you believe your package was lost or stolen after delivery confirmation, please contact your carrier directly. For packages lost in transit (never scanned), contact info@sisuresearchsupply.com and we will open a carrier investigation.
Shipping Support
For any shipping issue, email info@sisuresearchsupply.com with your order number and a description of the issue.