CET - Center for Environmental Therapeutics


Serving the public and profession since 1994

Dear Visitor,

The Center for Environmental Therapeutics is a nonprofit organization formed by doctors and researchers for the advancement of environmental therapies. We seek to provide accurate, unbiased information about bright light therapy, dawn-dusk simulation and negative air ionization.


Choose between our site with therapeutic resources and tools or our site with professional resources and tools. Both sites contain therapy overviews and an online store offering tested, recommended apparatus.


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On CET's site with Therapeutic Resources and Tools you will find a unique set of online self-assessment questionnaires that guide diagnosis and treatment. Read the Frequently Asked Questions, and post your own questions to clinical and research specialists on the Ask the Doctor Forum. We provide information in 15 languages.

On CET's site for Professional Resources and Tools you will find the Chronotherapeutics Forum, focused on treatment strategy and clinical problem solving. Downloads include reprints from the literature and assessment instruments.