Find a Practitioner

Connect with a functional medicine practitioner in your area who's using the Optimal DX platform in their practice. Practitioners who've been through our FBCA Mastery Training Program and those who've gone through the certification process are also indicated with the appropriate badge.

Kathryn van Zwieten

Healing Harvest, LLC
Tallahassee, Florida

About the practitioner

MSCN, CNS, LDN (FL)

About the practice

Clinical Nutritionist

Medical Specialties

Cardiometabolic
Detox
Family
GI Health
Immune Health
Men's Health
Nutrition
Thyroid
Women's Health
autoimmune, chronic complex conditions, neuronutrition

Graduate School Education

Sonoran University of Health Sciences

Professional Associations

OPTIMAL — THE ODX BLOG

Expand Your Knowledge

Browse our resources to learn more about Functional Blood Chemistry Analysis, blood biomarkers, the functional approach to medicine and more.

View All Resources

Biomarkers

Autoimmune Gastritis Disrupts Digestion and Nutrition

Discover the impact of autoimmune atrophic gastritis on digestion and nutrient absorption, including symptoms, related conditions, and the importance of early diagnosis.

Biomarkers

Nutrition Tips for Osteoarthritis

Discover how nutrition, including Mediterranean and plant-based diets, can support joint health and manage osteoarthritis symptoms effectively.

Biomarkers

Stress Changes Your Body: What Cortisol and DHEA-S Can Tell You

Discover how cortisol and DHEA-S reveal your body's response to stress and the importance of hormonal balance for health and aging. Learn more today.

Biomarkers

Is Your Blood Pressure Sensitive to Salt?

Discover the link between salt and blood pressure, learn how sodium and potassium balance impacts your health, and find tips for managing salt-sensitive hypertension.

The ODX Platform

Solutions For

Blood Chemistry

The Optimal DX Library

Blog & Podcast

Clinical Tools

Find a Practitioner

Kathryn van Zwieten

About the practitioner

About the practice

Medical Specialties

Graduate School Education

Professional Associations

Expand Your Knowledge

Autoimmune Gastritis Disrupts Digestion and Nutrition

Nutrition Tips for Osteoarthritis

Stress Changes Your Body: What Cortisol and DHEA-S Can Tell You

Is Your Blood Pressure Sensitive to Salt?