Vitamin D and Kidney Stones

Area of Science:

• Nephrology
• Endocrinology
• Metabolic Bone Disease

Background:

• The relationship between vitamin D and kidney stone formation (lithogenesis) is debated.
• Therapeutic vitamin D doses are generally considered safe regarding lithogenic risk.
• Evidence for vitamin D deficiency and supplementation benefits in non-rickets populations is limited.

Purpose of the Study:

• To review the current evidence on vitamin D supplementation and its association with lithogenesis.
• To clarify the risks and benefits of vitamin D supplementation in various patient populations.
• To address concerns regarding vitamin D's role in kidney stone formation.

Main Methods:

• Literature review of studies investigating vitamin D supplementation and lithogenesis.
• Analysis of evidence regarding vitamin D deficiency prevalence and supplementation efficacy.
• Examination of genetic factors, such as CYP24A1 mutations, in relation to stone formation.

Main Results:

• Most studies indicate that therapeutic vitamin D doses do not elevate lithogenic risk.
• A subset of stone formers, potentially those with CYP24A1 gene mutations, might have an increased risk of stone recurrence with supplementation.
• Data supporting vitamin D deficiency diagnosis and supplementation benefits in the general population (excluding rickets risk) is sparse.

Conclusions:

• Vitamin D supplementation is unlikely to increase kidney stone risk in the general population.
• Genetic factors may predispose certain individuals to stone recurrence with vitamin D.
• Vitamin D screening may be unnecessary for most patients; alternative bone-strengthening therapies exist that also reduce stone formation.