ISOM Membership is available to health care professionals from any of the existing ISOM Member Societies, and to individuals residing in a country where an official Society has not yet been formalized.

Canadian health care professionals should complete the membership application process via the Canadian Society for Orthomolecular Medicine website.

ISOM Membership is offered on an annual basis and expires one year from the date of application. New applicants are required to establish a user account for payment processing and access to registration discounts.