Ruth Kriz on Vitamin D for Recurrent UTI


July 29, 2026

In this video presentation, chronic urinary tract infection specialist Ruth Kriz discusses the crucial role of vitamin D in bladder health and immune defense. She explains how vitamin D triggers the secretion of cathelicidin in the bladder wall to combat bacterial pathogens and serves as an essential precursor for key hormones like cortisol and progesterone. Highlighting widespread deficiencies caused by sunscreen usage, inadequate dietary sources, and genetic vitamin D receptor mutations, Kriz emphasizes the necessity of targeted supplementation. She details practical strategies using bioavailable vitamin D3, alternative administration routes, and specific restorative versus maintenance dosing protocols to optimize immune resilience and prevent recurrent infections.

Key Take Aways

Bladder Immune System Activation


Vitamin D stimulates the bladder lining to produce cathelicidin, an antimicrobial peptide fighting bacterial infections.

Hormonal and Stress Precursor Role


Activated vitamin D supports adrenal function under chronic illness stress as a precursor to cortisol.

Sunscreen Limits Natural Synthesis


Sunscreen use and low dietary availability make natural vitamin D synthesis insufficient for most individuals.

Receptor Mutation Impairs Uptake


Genetic testing reveals vitamin D receptor mutations in chronic UTI patients, necessitating lifelong therapeutic supplementation.

Bioavailable Supplementation Options


Over-the-counter vitamin D3 offers superior bioavailability compared to prescription D2 for effective systemic absorption.

Restorative Dosing Protocol


Achieving optimal levels above 50 ng/mL requires short-term restorative dosing followed by continuous daily maintenance.
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Mellisa Kramer

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Founder, Live UTI Free

Melissa began interviewing experts after her own struggle with recurrent UTIs. She now works with a network of clinicians, researchers, and women’s health advocates to improve awareness, testing, and treatment options for chronic UTI.

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