Frequently Asked Questions

RUO is an industry classification for chemicals and biological materials sold for in-vitro research and laboratory development — not for human or veterinary use, and not for diagnosis, treatment, cure, or prevention of any disease. RUO products are not FDA-approved drugs. They are tools used in scientific investigation. Every product Crescent sells is RUO.

No. Products sold by Crescent are not FDA-approved for any therapeutic use. They have not been evaluated by the FDA. They are not intended to diagnose, treat, cure, or prevent any disease.

A COA is a document issued by an independent testing laboratory that records the analytical results for a specific lot of product — identity (typically by ESI-MS), purity (typically by HPLC at 220 nm), endotoxin content (typically by LAL kinetic chromogenic assay), and other quality parameters. Every Crescent product is independently tested before listing, and every order ships with the COA for the specific lot you receive.

Purity is measured by reverse-phase HPLC with UV detection at 220 nm, with identity confirmed against ESI-MS. The standard specification is ≥ 98.0%; measured values for individual lots are reported on each COA and on the corresponding product page.

Endotoxin content is measured by LAL (Limulus Amebocyte Lysate) kinetic chromogenic assay. The standard specification is < 0.5 EU/mg; measured values are reported on each COA.

You can check out as a guest so long as the supplementary information on the order form is completed correctly.

Three options at checkout:

• Bank account — ACH transfer processed through ValidiFI. Instant confirmation, no card fees.
• Zelle — direct bank-to-bank transfer, manual settlement.
• Cash App — send to our $Cashtag, manual settlement.

Manual-settlement methods (Zelle, Cash App) provide payment instructions after checkout — the order ships once we confirm the payment. Debit and Venmo card payments will return once our new processor integration is complete.

All 50 U.S. states plus Puerto Rico, Guam, and the U.S. Virgin Islands. We do not ship to international addresses, APO/FPO/DPO addresses, or P.O. boxes. See our Shipping Policy for details.

Not at this time. We ship within the United States and its territories only. We may expand service areas in the future; updates will be announced on the Site.

Orders placed before 12:00 PM ET on a business day typically ship the next business day. Orders placed after that window, on weekends, or on U.S. federal holidays ship within 1–2 business days. USPS Ground Advantage is typically 2–5 business days from our New York origin; USPS Priority Mail is typically 1–3 business days.

Yes. Every order ships free via USPS Ground Advantage with tracking — no minimum, no threshold, no fine print. USPS Priority Mail is offered as an optional $4.95 upgrade for customers who want faster transit.

For most destinations in the contiguous 48 states, Ground Advantage and Priority Mail have similar delivery windows and Ground is the more economical choice. Priority Mail may deliver noticeably faster to more distant destinations, including CA, WA, OR, NV, ID, AK, HI, PR, GU, and VI. USPS transit-time estimates are not guaranteed and can vary with distance, weather, and carrier load.

Report damage within 48 hours of delivery to [email protected] with photographs of the damage. We will dispatch a free replacement within 1–2 business days. See our Returns Policy for full details.

No, all sales are final. Limited exceptions apply, see our Returns Policy for full details.

Contact [email protected] within seven (7) days. We will ship the correct item at no cost and provide a return label for the incorrect item.

Orders may be cancelled before they enter the shipping queue, generally within thirty (30) minutes of placement. After that, orders are already in fulfillment and cannot be cancelled. Contact [email protected] immediately if you need to cancel.

Crescent Bioresearch LLC is based in New York. Orders ship from our New York facility to all 50 U.S. states, Puerto Rico, Guam, and the U.S. Virgin Islands.

We collect the information needed to fulfill your order: name, shipping and billing address, email address, optional phone number, and order history. Payment data is tokenized through our payment processor; we do not store full credit-card numbers. See our Privacy Policy for the full list and details.

All data transmitted to and from the Site is encrypted via TLS/SSL. Payment processing is PCI-DSS-compliant. Access to personal information is limited by role. See our Privacy Policy for our full security overview.

Yes. Contact [email protected] to request account deletion or data removal. We retain certain order records for seven (7) years to satisfy U.S. tax-compliance requirements.