Dr Theodora Mantzourani (London Functional Clinic)

The London Functional Clinic is a private functional medicine and bioidentical hormone practice at 10 Harley Street in Marylebone, led by Dr Theodora Mantzourani. Her stated qualifications include membership of the Royal College of General Practitioners (MRCGP), an MSc in Endocrinology and Diabetes from Queen Mary University of London, certification with the Institute for Functional Medicine (IFM), and fellowship of the American Academy of Anti-Aging Medicine (A4M), alongside postgraduate study in nutritional medicine at the University of Surrey and practical dermatology at Cardiff University.

The clinic focuses on functional endocrinology and bioidentical hormone replacement therapy (BHRT), covering estrogen, progesterone and testosterone with supporting thyroid, DHEA and melatonin. It offers a broad diagnostic panel including plasma and urine amino acids, fatty acid analysis, urine organic acids, comprehensive stool analysis, IgG and IgE testing, salivary testing, functional endocrine profiles (including glucose tolerance and ACTH stimulation tests), and SNP genetic testing. Additional services span an anti-aging and weight management program, nutritional medicine and a medical concierge.

Published fees start at for a 30 minute consultation, for 45 minutes and for one hour, with a new patient consultation at. Private prescriptions are and letters, certificates and referrals start at. Functional medicine packages are quoted price on application, and the clinic notes that the initial consultation fee does not include tests, insurance forms, referral letters or follow-up appointments. The practice operates as London Functional Clinic Ltd (Companies House 12701034, incorporated 2020). Booking is by phone on 020 7467 1510 or via secretary@londonfunctionalclinic.com.