Background Vitamin D, a hormone involved in the regulation of mineral homeostasis, protects skeletal integrity and modulates cell growth and differentiation. Recently, its potential antifibrotic effects have also been identified. Children with chronic liver disease mostly suffer from vitamin D deficiency. However, little knowledge is known regarding the optimum regimen that can be utilized effectively and safely to correct vitamin D deficiency in these patients and whether it could be effective in reversal or at least halting the progressive process of liver fibrosis. This study is conducted to answer these questions. Results Twenty-four children with chronic liver disease (13 boys and 11 girls) were included in the study. Their age ranged from 4.5 to 11.5 years with median age of 8 years. The aetiology of liver disease was heterogenous with autoimmune hepatitis, glycogen storage disease, or chronic hepatitis, and hepatitis C affects the majority. The patients were divided into two matched groups: group A (n:12) that received stoss parenteral intramuscular vitamin D3 (cholecalciferol) therapy (200,000 IU) once followed by 600 IU/day orally for 6 months (this is equivalent to the RDA as maintenance therapy) and group B (n:12) that received 50,000 IU/week oral vitamin D3 (cholecalciferol) therapy in divided daily doses adding on the maintenance dose 600 IU/day for the first 4 weeks followed by only 600 IU/day orally for the rest of the 6 months (5 months). Following vitamin D3 supplementation, in group A (vitamin D stoss therapy group) and group B (vitamin D oral therapy group), there were statistically significant improvement of Ca, alkaline phosphatase, and vitamin D levels, though there was no difference in between both groups. No significant correlation could be found between vitamin D changes and fibroscan changes in either group. Conclusion Vitamin D therapy using stoss dose followed by oral therapy or oral vitamin D therapy from the start was equally safe and effective in improving the clinical and laboratory metabolic bone profile abnormalities. Vitamin D effect on liver fibrosis progression or reversion in children is still not understood, and further studies are needed in this field taking in consideration the various causes of liver disease in children.
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