Vitamin D supplementation for sickle cell disease

Area of Science:

• Hematology
• Nutritional Science
• Clinical Research

Background:

• Sickle cell disease (SCD) is a genetic disorder causing chronic inflammation and hemolytic anemia.
• SCD leads to numerous complications, including bone issues and nutritional deficiencies like vitamin D deficiency.
• Vitamin D deficiency may exacerbate musculoskeletal problems in individuals with SCD.

Purpose of the Study:

• To assess if vitamin D supplementation increases serum 25-hydroxyvitamin D levels in pediatric and adult SCD patients.
• To evaluate the impact of vitamin D supplementation on general health, musculoskeletal health, and respiratory health in SCD.
• To determine the safety profile of vitamin D supplementation in SCD patients.

Main Methods:

• Searched major databases and trial registries for randomized controlled trials (RCTs) and quasi-RCTs.
• Included studies comparing any form of oral vitamin D supplementation with placebo or no supplementation.
• Two authors independently extracted data and assessed study bias using GRADE guidelines.

Main Results:

• One eligible study with 39 participants was included; 25 completed the follow-up.
• Vitamin D supplementation significantly increased serum 25-hydroxyvitamin D (25(OH)D) levels compared to placebo (moderate quality evidence).
• Vitamin D supplementation showed a trend towards fewer pain days (low quality evidence) but a worse health-related quality of life (low quality evidence).

Conclusions:

• The single included study had a high risk of bias, particularly due to incomplete outcome data.
• Current evidence is insufficient to guide clinical practice for vitamin D supplementation in SCD.
• High-quality, well-designed RCTs are needed to establish the efficacy and safety of vitamin D supplementation in SCD.