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  • Consultations
    • Doctor Consultations
    • Free Walsh Protocol Pre-Consultation
    • 15-Minute Phone Consultation with Dr. Epstein
    • Walsh Protocol Biotype Assessment (Initial Consultation)
    • Walsh Protocol Biotype + Methylation Panel — Initial Consultation
    • Follow-Up Assessment — Biotype Labs Review with Report
    • Follow-Up Methylation Panel Review with Report
    • Follow-Up Consultation – Updated Assessment | Biotype Labs + Methylation Panel
    • Functional Medicine Consultation — Comprehensive Assessment with Report
    • Folate Receptor Antibody Test (FRAT Test) with Online Physician Consultation
  • Conditions
    • ADHD
    • Anxiety
    • Autism
    • Bipolar Disorder
    • Dementia
    • Dysautonomia
    • Histamine
    • Insomnia
    • Kidney Toxicity
    • Liver Toxicity
    • Oxidative Stress
    • OCD – Obsessive Compulsive Disorder
    • Schizophrenia
  • Medications
    • Choosing the Best Antidepressant
    • SSRIs Explained
    • SNRIs Explained
    • ADHD Medications
    • Mood Stabilizers
    • Antipsychotics Medications
  • Labs
    • All Biotype Panels
      • Comprehensive Biotype Panel
      • Methylation Panel – Genova
      • Methylation Panel – Doctors Data
      • Copper Overload Biotype Panel
      • Hair Mineral and Toxic Elements
      • Panel 2: Allergy & Immune Reactivity
      • Oxidative Stress Screen (8-OHdG)
      • Mitochondrial / Gut-Metabolic Organic Acids
      • Panel 5: Toxic Metals & Antioxidant Reserve
    • Biotype Single Tests
      • Histamine, Whole Blood
      • Homocysteine
      • Plasma Zinc Test | Zinc Deficiency Blood Test
      • Copper
      • Ceruloplasmin
      • Pyrroles, Urine
      • Vitamin D
      • CBC
      • Metabolic Panel
      • Hair and Toxic Elements
    • Other Popular Lab Panels
      • Apolipoprotein B (Lipids)
      • Cholesterol w basic lipids
      • Comprehensive Stool Analysis (CPP)
      • Cortisol – Salivary
      • Leaky Gut / Celiac Lab Tests
      • Female Hormone Panel
      • Folate RBC
      • Folate Receptor Antibody (FRAT Test)
      • Glucose, Lipids and Inflammation
      • Hashimoto’s Thyroid Panel
      • HS-CRP (C-Reactive Protein)
      • Lipids, HbA1C
      • Magnesium RBC Test
      • MTHFR plus C677T and A1298C
      • MycoTOX Profile: Comprehensive Mold
      • Testosterone, Free/Total
    • Common Lab Findings
      • Zinc Deficiency
      • Copper Overload
      • Low Ceruloplasmin & Free Copper
      • High Histamine
      • Elevated Homocysteine
      • High Urine Pyrroles
      • Elevated SAH & Low SAM
      • High Basophils
      • View All Lab Findings
  • The Walsh Approach
    • Second Opinion Articles Hub
    • Five Biotypes of Depression
    • – Undermethylation
    • – Overmethylation
    • – Copper Overload
    • – Pyroluria
    • – Toxic Overload
    • What is WalshDoc?
    • WalshDoc Biotype Questionnaire
    • What Causes Undermethylation?
    • Understanding the Methylation Test
    • SAH, Methylation, and Mood
    • Five Epigenetic Biotypes of Undermethylation
    • Why Folic Acid Can Worsen Depression
    • Walsh Protocol Nonresponders
    • Walsh Research and Publications
    • Walsh Research Institute – William Walsh, PhD
  • General Info
    • Blog
    • About Us
    • Contact Us
    • My Account (Login/Orders)
    • Payment Information
    • Schedule An Appointment
    • Reschedule My Appointment
    • Supplements (biotypenutrients.com):
      • Undermethylation
      • Overmethylation
      • Pyroluria
      • Copper Overload
      • Toxic Overload
      • Intestinal Health
      • Homocysteine
      • Kidney Detoxification
      • Liver Detoxification
      • Ceruloplasmin
  • FAQs
  • Take the Test
    • Patient Questionnaires
    • What is WalshDoc?
    • WalshDoc Labs and Report Workflow
    • WalshDoc Biotype Questionnaire
    • WalshDoc Biotype + Toxic Burden Questionnaire
    • WalshDoc Biotype + Toxic Burden Follow-Up Questionnaire
    • WalshDoc Pediatric Neurodevelopment Questionnaire
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Key Tests and Consultation Items
  • Consultations
    • Doctor Consultations
    • Free Walsh Protocol Pre-Consultation
    • 15-Minute Phone Consultation with Dr. Epstein
    • Walsh Protocol Biotype Assessment (Initial Consultation)
    • Walsh Protocol Biotype + Methylation Panel — Initial Consultation
    • Follow-Up Assessment — Biotype Labs Review with Report
    • Follow-Up Methylation Panel Review with Report
    • Follow-Up Consultation – Updated Assessment | Biotype Labs + Methylation Panel
    • Functional Medicine Consultation — Comprehensive Assessment with Report
    • Folate Receptor Antibody Test (FRAT Test) with Online Physician Consultation
  • Conditions
    • ADHD
    • Anxiety
    • Autism
    • Bipolar Disorder
    • Dementia
    • Dysautonomia
    • Histamine
    • Insomnia
    • Kidney Toxicity
    • Liver Toxicity
    • Oxidative Stress
    • OCD – Obsessive Compulsive Disorder
    • Schizophrenia
  • Medications
    • Choosing the Best Antidepressant
    • SSRIs Explained
    • SNRIs Explained
    • ADHD Medications
    • Mood Stabilizers
    • Antipsychotics Medications
  • Labs
    • All Biotype Panels
      • Comprehensive Biotype Panel
      • Methylation Panel – Genova
      • Methylation Panel – Doctors Data
      • Copper Overload Biotype Panel
      • Hair Mineral and Toxic Elements
      • Panel 2: Allergy & Immune Reactivity
      • Oxidative Stress Screen (8-OHdG)
      • Mitochondrial / Gut-Metabolic Organic Acids
      • Panel 5: Toxic Metals & Antioxidant Reserve
    • Biotype Single Tests
      • Histamine, Whole Blood
      • Homocysteine
      • Plasma Zinc Test | Zinc Deficiency Blood Test
      • Copper
      • Ceruloplasmin
      • Pyrroles, Urine
      • Vitamin D
      • CBC
      • Metabolic Panel
      • Hair and Toxic Elements
    • Other Popular Lab Panels
      • Apolipoprotein B (Lipids)
      • Cholesterol w basic lipids
      • Comprehensive Stool Analysis (CPP)
      • Cortisol – Salivary
      • Leaky Gut / Celiac Lab Tests
      • Female Hormone Panel
      • Folate RBC
      • Folate Receptor Antibody (FRAT Test)
      • Glucose, Lipids and Inflammation
      • Hashimoto’s Thyroid Panel
      • HS-CRP (C-Reactive Protein)
      • Lipids, HbA1C
      • Magnesium RBC Test
      • MTHFR plus C677T and A1298C
      • MycoTOX Profile: Comprehensive Mold
      • Testosterone, Free/Total
    • Common Lab Findings
      • Zinc Deficiency
      • Copper Overload
      • Low Ceruloplasmin & Free Copper
      • High Histamine
      • Elevated Homocysteine
      • High Urine Pyrroles
      • Elevated SAH & Low SAM
      • High Basophils
      • View All Lab Findings
  • The Walsh Approach
    • Second Opinion Articles Hub
    • Five Biotypes of Depression
    • – Undermethylation
    • – Overmethylation
    • – Copper Overload
    • – Pyroluria
    • – Toxic Overload
    • What is WalshDoc?
    • WalshDoc Biotype Questionnaire
    • What Causes Undermethylation?
    • Understanding the Methylation Test
    • SAH, Methylation, and Mood
    • Five Epigenetic Biotypes of Undermethylation
    • Why Folic Acid Can Worsen Depression
    • Walsh Protocol Nonresponders
    • Walsh Research and Publications
    • Walsh Research Institute – William Walsh, PhD
  • General Info
    • Blog
    • About Us
    • Contact Us
    • My Account (Login/Orders)
    • Payment Information
    • Schedule An Appointment
    • Reschedule My Appointment
    • Supplements (biotypenutrients.com):
      • Undermethylation
      • Overmethylation
      • Pyroluria
      • Copper Overload
      • Toxic Overload
      • Intestinal Health
      • Homocysteine
      • Kidney Detoxification
      • Liver Detoxification
      • Ceruloplasmin
  • FAQs
  • Take the Test
    • Patient Questionnaires
    • What is WalshDoc?
    • WalshDoc Labs and Report Workflow
    • WalshDoc Biotype Questionnaire
    • WalshDoc Biotype + Toxic Burden Questionnaire
    • WalshDoc Biotype + Toxic Burden Follow-Up Questionnaire
    • WalshDoc Pediatric Neurodevelopment Questionnaire
Dr Dave’s Blog
  • 31
    Jul
    Understanding the Methylation Test No Comments on Understanding the Methylation Test
  • 29
    Jul
    Trauma, TBI, & Hormones – Mark Gordon, MD No Comments on Trauma, TBI, & Hormones – Mark Gordon, MD
  • 25
    Jul
    Insomnia No Comments on Insomnia
  • 24
    Jul
    Alkaline Diet and Kidney Function Comments Off on Alkaline Diet and Kidney Function
  • 24
    Jul
    How Toxic Overload Causes Mood Disorders No Comments on How Toxic Overload Causes Mood Disorders
  • 24
    Jul
    Liver Detoxification Pathways: Phases, Glutathione and Bile Comments Off on Liver Detoxification Pathways: Phases, Glutathione and Bile
  • 23
    Jul
    Kidney Detoxification, Elevated SAH and Methylation Comments Off on Kidney Detoxification, Elevated SAH and Methylation
  • 23
    Jul
    Five Epigenetic Biotypes of Undermethylation | Beyond MTHFR No Comments on Five Epigenetic Biotypes of Undermethylation | Beyond MTHFR
  • 22
    Jul
    Walsh Toxic Overload Biotype: Elevated SAH, Zinc and the SAHH Bottleneck Comments Off on Walsh Toxic Overload Biotype: Elevated SAH, Zinc and the SAHH Bottleneck
  • 22
    Jul
    Undermethylation, Autism & Mitochondria 2 Comments on Undermethylation, Autism & Mitochondria
Blog Tags
Alzheimer's Disease Anxiety Autism Ceruloplasmin Copper Overload Creatine Demand Dementia Depression Dysautonomia Elevated SAH Epigenetics Folate Folinic Acid FRAT Testing Gut Health Heavy Metals Histamine Histamine Intolerance Homocysteine Infections Inflammation Ketogenic Therapy Liver Detoxification Long COVID Mast Cell Activation Mediterranean Diet Methylation Methylation Impediments Mitochondrial Dysfunction MTHFR Nutrient Deficiencies OCD Overmethylation Oxidative Stress Ozone Therapy Parkinson's Disease pH & Alkalinity Respiratory Infections SAM/SAH Ratio Toxic Overload Undermethylation Vitamin D Walsh Approach William Walsh Zinc Deficiency
Five Biotypes of Depression
  • FAQs
  • Undermethylation
  • Overmethylation
  • Copper Overload
  • Pyroluria
  • Toxic Overload
  • Five Epigenetic Biotypes of Undermethylation
  • Take the Test!
Copyright 2026 © Second Opinion Physician, P.C.
  • ×
  • Consultations
    • Doctor Consultations
    • Free Walsh Protocol Pre-Consultation
    • 15-Minute Phone Consultation with Dr. Epstein
    • Walsh Protocol Biotype Assessment (Initial Consultation)
    • Walsh Protocol Biotype + Methylation Panel — Initial Consultation
    • Follow-Up Assessment — Biotype Labs Review with Report
    • Follow-Up Methylation Panel Review with Report
    • Follow-Up Consultation – Updated Assessment | Biotype Labs + Methylation Panel
    • Functional Medicine Consultation — Comprehensive Assessment with Report
    • Folate Receptor Antibody Test (FRAT Test) with Online Physician Consultation
  • Conditions
    • ADHD
    • Anxiety
    • Autism
    • Bipolar Disorder
    • Dementia
    • Dysautonomia
    • Histamine
    • Insomnia
    • Kidney Toxicity
    • Liver Toxicity
    • Oxidative Stress
    • OCD – Obsessive Compulsive Disorder
    • Schizophrenia
  • Medications
    • Choosing the Best Antidepressant
    • SSRIs Explained
    • SNRIs Explained
    • ADHD Medications
    • Mood Stabilizers
    • Antipsychotics Medications
  • Labs
    • All Biotype Panels
      • Comprehensive Biotype Panel
      • Methylation Panel – Genova
      • Methylation Panel – Doctors Data
      • Copper Overload Biotype Panel
      • Hair Mineral and Toxic Elements
      • Panel 2: Allergy & Immune Reactivity
      • Oxidative Stress Screen (8-OHdG)
      • Mitochondrial / Gut-Metabolic Organic Acids
      • Panel 5: Toxic Metals & Antioxidant Reserve
    • Biotype Single Tests
      • Histamine, Whole Blood
      • Homocysteine
      • Plasma Zinc Test | Zinc Deficiency Blood Test
      • Copper
      • Ceruloplasmin
      • Pyrroles, Urine
      • Vitamin D
      • CBC
      • Metabolic Panel
      • Hair and Toxic Elements
    • Other Popular Lab Panels
      • Apolipoprotein B (Lipids)
      • Cholesterol w basic lipids
      • Comprehensive Stool Analysis (CPP)
      • Cortisol – Salivary
      • Leaky Gut / Celiac Lab Tests
      • Female Hormone Panel
      • Folate RBC
      • Folate Receptor Antibody (FRAT Test)
      • Glucose, Lipids and Inflammation
      • Hashimoto’s Thyroid Panel
      • HS-CRP (C-Reactive Protein)
      • Lipids, HbA1C
      • Magnesium RBC Test
      • MTHFR plus C677T and A1298C
      • MycoTOX Profile: Comprehensive Mold
      • Testosterone, Free/Total
    • Common Lab Findings
      • Zinc Deficiency
      • Copper Overload
      • Low Ceruloplasmin & Free Copper
      • High Histamine
      • Elevated Homocysteine
      • High Urine Pyrroles
      • Elevated SAH & Low SAM
      • High Basophils
      • View All Lab Findings
  • The Walsh Approach
    • Second Opinion Articles Hub
    • Five Biotypes of Depression
    • – Undermethylation
    • – Overmethylation
    • – Copper Overload
    • – Pyroluria
    • – Toxic Overload
    • What is WalshDoc?
    • WalshDoc Biotype Questionnaire
    • What Causes Undermethylation?
    • Understanding the Methylation Test
    • SAH, Methylation, and Mood
    • Five Epigenetic Biotypes of Undermethylation
    • Why Folic Acid Can Worsen Depression
    • Walsh Protocol Nonresponders
    • Walsh Research and Publications
    • Walsh Research Institute – William Walsh, PhD
  • General Info
    • Blog
    • About Us
    • Contact Us
    • My Account (Login/Orders)
    • Payment Information
    • Schedule An Appointment
    • Reschedule My Appointment
    • Supplements (biotypenutrients.com):
      • Undermethylation
      • Overmethylation
      • Pyroluria
      • Copper Overload
      • Toxic Overload
      • Intestinal Health
      • Homocysteine
      • Kidney Detoxification
      • Liver Detoxification
      • Ceruloplasmin
  • FAQs
  • Take the Test
    • Patient Questionnaires
    • What is WalshDoc?
    • WalshDoc Labs and Report Workflow
    • WalshDoc Biotype Questionnaire
    • WalshDoc Biotype + Toxic Burden Questionnaire
    • WalshDoc Biotype + Toxic Burden Follow-Up Questionnaire
    • WalshDoc Pediatric Neurodevelopment Questionnaire
  • Login / Register
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