About
Dr. Katherine Lantsman is a board-certified internist who specializes in functional and preventive medicine. She received her medical degree from St. George's School of Medicine. Dr. Lantsman completed her residency in Internal Medicine at Lenox Hill Hospital. Her interest in holistic care began during a residency rotation at Beth Israel's Center for Health and Healing.
Dr. Lantsman's personal health experience deeply informs her approach to fertility wellness. After conventional treatments were unsuccessful, she used functional medicine for her own healthy pregnancy. This success fuels her passion for helping others overcome similar difficulties. She personally embodies a wellness lifestyle through diet, yoga, and meditation.
Education & Training
Undergraduate
Brandeis University, BS
Medical School
St. George's School of Medicine, MD
Residency
Internal Medicine, Lenox Hill Hospital
Fellowship
Gastroenterology Research, Lenox Hill Hospital
Certifications
Conditions Treated
Who is Dr. Lantsman right for?
Dr. Lantsman works well with patients who have sought answers from multiple specialists without resolution. Adults managing chronic conditions like thyroid dysfunction, autoimmune disorders, or hormonal imbalances benefit from her root-cause approach. She is a strong fit for women navigating fertility challenges or preconception health planning. Patients dealing with complex issues such as mast cell activation, tick-borne illness, or weight resistance also find her practice a good match. Her extended appointments suit patients who want thorough, unhurried evaluations.
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Frequently Asked Questions
Dr. Lantsman specializes in hormone imbalances, thyroid dysfunction, autoimmune disorders, and fertility wellness. She also treats mast cell activation, tick-borne illness, COVID vaccine complications, and stubborn weight issues. Her functional medicine approach helps her identify biological triggers that conventional workups often miss.
Dr. Lantsman conducts thorough holistic evaluations that examine medical history, genetics, and environmental influences together. She uses advanced laboratory testing, including genomic profiles, nutritional panels, and cardiovascular risk assessments, to build a precise clinical picture. Initial visits typically run two hours to allow enough time for this depth of evaluation.
Yes, Dr. Lantsman holds board certification in Internal Medicine. She trained at Lenox Hill Hospital for both her residency and her fellowship in Gastroenterology Research.
Dr. Lantsman's personal experience with fertility directly shapes her clinical focus. After conventional treatments proved unsuccessful for her own pregnancy, she used functional medicine and achieved a healthy outcome. She now brings that firsthand understanding to patients facing similar challenges.
Yes, Dr. Lantsman offers hormone therapies including Bioidentical Hormone Replacement Therapy. She runs an annual BHRT program priced at $1,750 per year. She also evaluates and treats low testosterone in men.
Dr. Lantsman uses cutting-edge laboratory testing tailored to each patient's presentation. Her testing menu includes genomic profiles, nutritional evaluations, cardiovascular risk assessments, tick-borne illness panels, parasite testing, and food allergy testing. She uses these results to build precise, individualized treatment plans.
Yes, Dr. Lantsman offers telemedicine visits for patients who prefer remote care. This option is available alongside in-person visits at her Brookline, MA location.
Dr. Lantsman practices what she teaches. She maintains a wellness lifestyle that includes yoga, meditation, and a nutrition-focused diet. These personal commitments inform how she counsels patients on stress reduction and lifestyle change.
Doctor profile last updated March 21, 2026