HistDAO
HistDAO™ provides a concentrated source of diamine oxidase (DAO)—the main enzyme responsible for the degradation of ingested histamine. This formula delivers the clinically researched dose of DAO in an easy-to-swallow, gastro-resistant mini-tablet, which is essential for releasing DAO in the small intestine, where it breaks down food-derived histamine. HistDAO does not manage or address antibody-related or IgE-related food allergies.
Orders are processed within 1–3 business days, depending on availability and credit card authorization. After processing, your order will ship at the speed you selected during checkout. Please note we don’t ship on weekends or major holidays, and shipping timelines may be affected by the carrier.
Once your package is scanned by the carrier, tracking information will be sent to you by email or text message. Please allow 24–48 hours for tracking details to update.
While we ensure satisfaction, we don't accept returns on any products or supplements. If you have any concerns, please email us at shop@jamesclinic.com, and we'll work to resolve them with you.