Pfeiffer Protocol (Biotype Testing)
Biochemical testing (blood histamine, copper, zinc, methylation) used to sort people into biotypes and recommend targeted nutrients.
35/100
Carl Pfeiffer
3 to 6 months to judge benefit, then ongoing with retesting
15 phases
5 conditions
Protocol Overview
Biochemical testing (blood histamine, copper, zinc, methylation) used to sort people into biotypes and recommend targeted nutrients. Five main biotypes: undermethylation, overmethylation, copper overload, pyrrole disorder and normal. Used alongside psychiatric care.
Used For
Key Resources
Supplements & Herbs
Safety Profile
Pfeiffer founded the Princeton Bio Center and reported treating more than 20,000 patients. The biotype percentages come from clinic records, not controlled trials, and tests such as urine kryptopyrrole are not validated. Testing can reveal nutrient imbalances worth correcting. If you are thinking about suicide or in crisis, call or text 988 (Suicide and Crisis Lifeline) or call 911.
Find a Practitioner
Gabriel can find and book a practitioner who works with this approach.
Book with GabrielAbout Evidence Score
The Evidence Score (0 to 100) rates the strength of evidence from studies in people for the uses listed: higher means stronger, more consistent research. It does not measure safety. It is not medical advice.
For education, not medical advice. Talk with a licensed clinician before you start, and never stop or change a prescribed medication without your prescriber.