Vitamin supplementation in adolescents
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Vitamin D Supplementation Guidelines and Recommendations in Adolescents
There is broad agreement that adolescents should maintain serum 25-hydroxyvitamin D levels above 25–30 nmol/L to support bone health, but there is no consensus on the optimal target concentration, with recommendations ranging from 25 nmol/L to 150 nmol/L. Daily preventive vitamin D supplementation doses for adolescents vary widely, from 400 IU to 4,000 IU, depending on factors such as season, skin pigmentation, sun exposure, diet, BMI, and medical conditions. The upper tolerable intake is generally set at 4,000 IU/day. After treating deficiency, a maintenance dose is usually recommended. However, there is a lack of unified, evidence-based guidance on vitamin D needs during adolescence, highlighting the need for stronger clinical recommendations .
Vitamin D Supplementation and Mental Health in Adolescents
Multiple studies indicate that vitamin D supplementation can reduce depressive symptoms in adolescents. National supplementation programs have been shown to be cost-effective strategies for improving mental health and preventing depression, with evidence supporting both cost savings and improvements in quality-adjusted life years (QALYs) Jasemi2023Pruneti2023. Randomized controlled trials also demonstrate that vitamin D supplementation leads to a significant reduction in depression scores among adolescents, suggesting that nutritional interventions can be beneficial for mental health in this age group .
Vitamin D Supplementation and Physical Health Outcomes
Bone Health and Density
Vitamin D supplementation in healthy children and adolescents has only a small effect on bone mineral density, particularly at the hip, and does not show clinically important benefits for bone density overall, regardless of baseline vitamin D status. These findings are mostly applicable to White postpubertal girls and may not extend to those with severe deficiency or symptomatic conditions like rickets .
Body Weight and BMI
Vitamin D supplementation may lead to a small but statistically significant reduction in BMI among children and adolescents, though it may also be associated with slight weight gain in healthy pediatric populations, especially at doses up to 600 IU/day. The evidence for changes in other anthropometric measures, such as fat mass and waist circumference, is less clear and of low to moderate certainty . In overweight and obese adolescents, vitamin D supplementation slightly increases circulating vitamin D levels, but its effects on metabolic and cardiovascular outcomes remain controversial .
Blood Pressure
Current evidence suggests that vitamin D supplementation does not significantly lower systolic or diastolic blood pressure in children and adolescents. The quality of evidence for these outcomes is low to moderate, and no consistent benefit has been observed .
Cost-Effectiveness of Vitamin D Supplementation Programs
National vitamin D supplementation programs for adolescents have been found to be cost-effective strategies for preventing both depression and chronic diseases such as cardiovascular disease (CVD) and type 2 diabetes mellitus (T2DM) in adulthood. The costs of supplementation are substantially lower than the costs of treating these conditions later in life, making supplementation a dominant and economically favorable public health intervention, especially in populations with high rates of vitamin D deficiency Jasemi2023Zandieh2021Zandieh2022.
Conclusion
Vitamin D supplementation in adolescents is widely recommended to prevent deficiency and support bone health, though optimal dosing and target serum levels remain debated. Supplementation shows promise in reducing depressive symptoms and is cost-effective for preventing future chronic diseases. However, its benefits for bone density, body weight, and blood pressure are limited or uncertain. More high-quality research is needed to refine guidelines and clarify the full range of health impacts in this age group.
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