If you are in crisis: Please contact a mental health professional or crisis line immediately. In the US, call or text 988 (Suicide & Crisis Lifeline) at any time. Functional medicine is not crisis care — it is a long-term investigative approach. If you are in immediate distress, please seek help now.
What are depression and anxiety?
Depression and anxiety are among the most common conditions worldwide, affecting hundreds of millions of people. Conventional treatment — SSRIs, SNRIs, benzodiazepines — is effective for many, but a significant portion of patients don't respond well, or respond partially and still struggle with quality of life.
What conventional treatment rarely addresses is the underlying biology. Functional medicine asks: why is the brain struggling in the first place? The answer is often found in the body — in the gut, the thyroid, the adrenals, the immune system, or nutrient levels that lab work never checks.
Important context: Functional medicine does not replace psychiatry for severe mental illness. It is most powerful as a complement to conventional care, or for patients whose conventional treatments haven't worked. Many practitioners in this directory are trained to work alongside prescribing physicians.
Common symptoms
- Persistent low mood and loss of interest in activities (anhedonia)
- Anxiety, excessive worry, or recurring panic
- Sleep disruption — difficulty falling asleep, staying asleep, or waking unrefreshed
- Fatigue and low energy even after rest
- Brain fog, difficulty concentrating, or poor memory
- Irritability and emotional dysregulation
- Social withdrawal and loss of motivation
- Physical symptoms — gut issues, chronic pain, and fatigue commonly co-present with mood disorders
How functional medicine approaches depression & anxiety
A functional medicine practitioner doesn't start with a prescription pad. They start with a comprehensive investigation into the biological systems that govern brain chemistry, neuroinflammation, hormonal balance, and gut health — all of which directly influence mood and cognition.
Root causes they look for
- Neuroinflammation — inflammatory cytokines directly impair serotonin synthesis and neuroplasticity, creating a biological substrate for depression
- Gut-brain axis dysfunction — approximately 95% of the body's serotonin is produced in the gut; dysbiosis disrupts production and increases intestinal permeability, allowing inflammatory compounds into the bloodstream
- Thyroid dysfunction — hypothyroidism commonly presents as depression and is frequently missed with standard TSH-only testing
- Nutrient deficiencies — B12, folate and methylation pathway issues, vitamin D, magnesium, zinc, and omega-3 fatty acids are all critical to neurotransmitter production and brain function
- Blood sugar dysregulation — glucose crashes drive anxiety, irritability, and mood instability that mimics or worsens psychiatric conditions
- HPA axis dysregulation — chronic stress depletes neurotransmitter precursors and dysregulates cortisol patterns that govern mood and energy
- Hormonal imbalances — low progesterone and low testosterone are strongly associated with anxiety and depression
- MTHFR mutation and methylation issues — impaired methylation limits the body's ability to produce and recycle neurotransmitters like serotonin, dopamine, and norepinephrine
- Chronic infections — Lyme disease, mold exposure, and reactivated viral infections (EBV, HHV-6) can drive neuroinflammation and mood symptoms
- Heavy metal toxicity — mercury, lead, and other metals interfere with neurological function
The functional medicine workup
A comprehensive evaluation typically includes:
- Full thyroid panel (TSH, Free T3, Free T4, Reverse T3, antibodies)
- Comprehensive metabolic panel, fasting glucose, and insulin
- Methylation panel including MTHFR genetic testing
- Organic acids test (measures neurotransmitter metabolites and mitochondrial markers)
- Gut microbiome testing (GI-MAP or equivalent)
- Inflammation panel (CRP, homocysteine, cytokines)
- Vitamin D, B12, folate, zinc, magnesium, omega-3 index
- Cortisol curve (4-point saliva or DUTCH test)
- Sex hormones (estrogen, progesterone, testosterone)
Treatment approaches
Treatment is individualized based on findings, but commonly involves:
- Targeted supplementation based on testing — methylfolate, methylB12, omega-3s, magnesium glycinate, vitamin D
- Adaptogenic and evidence-supported botanicals — saffron, ashwagandha, and others when indicated
- Gut healing protocols if dysbiosis or leaky gut is present
- Blood sugar stabilization through nutrition
- HPA axis support — stress regulation, sleep hygiene, cortisol management
- Hormone optimization when deficiencies are identified
- Heavy metal or mold detoxification protocols if relevant
- Coordination with existing psychiatrists or therapists when appropriate
What to look for in a specialist
- Integrative psychiatry training or deep experience at the intersection of mental health and functional medicine
- Methylation and nutrient expertise — specifically comfort with MTHFR, organic acids testing, and targeted supplementation
- Gut-brain axis knowledge — experience with microbiome testing and gut healing for neurological and mood outcomes
- Willingness to collaborate with your existing mental health providers, not replace them
- Thorough lab work that goes well beyond a standard metabolic panel
