Verified & credential-checked
Dr. Andrew Castellanos
ND, LAc · Naturopathic Doctor
Portland, Oregon · 16 years in practice
About
Gut-brain axis and inflammatory load
Dr. Andrew Castellanos graduated from the National University of Natural Medicine and is licensed as a naturopathic physician in Oregon and Washington, with additional licensure in acupuncture.
He sees a high volume of post-viral and post-mold cognitive complaints where standard workups return normal. His evaluation covers intestinal permeability, mycotoxin exposure, histamine handling, and micronutrient status.
He co-manages actively with MDs in the network and refers out early when a presentation suggests neurodegenerative rather than inflammatory disease.
Specialties
Approach
A three-phase model, so you know what happens at each stage and what you leave with.
01
Assessment
Environmental and exposure history, GI mapping, organic acids, and micronutrient panel.
02
Strategy
A staged removal-then-repletion sequence, ordered so one variable changes at a time.
03
Execution
Six-week symptom scoring, retesting of the abnormal markers only, and referral out if trajectory stalls.
What clients say
Two years of brain fog after a bad flu. He found what was driving it in eight weeks.
He told me directly when something was outside his scope and sent me to a neurologist. I trusted him more for it.
Credentials & Affiliations
American Association of Naturopathic Physicians
Oregon Board of Naturopathic Medicine
ISEAI