Vitamin D after kidney transplant: mixed bone results and risk of high blood calcium
A review found higher femoral-neck bone density, no significant fracture difference, and increased risk of excess blood calcium.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Vitamin D improved bone density at the femoral neck in kidney transplant recipients, but fracture incidence and lumbar-spine bone density did not differ significantly from placebo or no treatment. Excess blood calcium was more likely with supplementation. The review does not establish that better bone measurements led to fewer fractures.
More than half the studies had high risk of bias. This summary uses only the abstract, which does not identify a preferred supplement type or dose.
What researchers found
Femoral-neck bone mineral density
Over 3–12 months, density was 0.54 standard deviations higher with vitamin D than placebo or no treatment; this is not a percentage.
Excess blood calcium (hypercalcemia)
Over 3–12 months, risk with vitamin D was 1.92 times that with placebo or no treatment. Absolute event rates were not reported.
Laboratory findings
The review also reported lower parathyroid hormone and bone alkaline phosphatase levels, alongside higher serum calcium. These laboratory findings do not establish that supplementation prevents fractures.
Interpreting uncertain findings
The favorable bone-density result concerned the femoral neck. Lumbar-spine density and fractures showed no statistically significant difference; that leaves uncertainty and does not prove supplementation has no effect.
The original publication
Effects of vitamin D supplements on bone metabolism in kidney transplant recipients: a systematic review and meta-analysis.
Cai P, Shu Z, Zhou T et al.
Syst Rev · 2025
- PubMed ID
- 40993781
- Record checked
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