# What Happened When I Took Vitamin D Supplements Every Day
Vitamin D deficiency affects roughly 1 billion people worldwide, yet many parents remain unaware of how this nutrient shapes their family's health. A journalist from Prevention magazine documented her experience taking vitamin D supplements daily to understand the real-world effects on bone health, immune function, and general wellness.
Vitamin D plays three critical roles in your body. First, it regulates calcium absorption, which builds and maintains strong bones in children and adults alike. Second, it supports immune function, helping your body fight infections. Third, emerging research suggests it influences mood and energy levels.
The journalist's experience reflects what research consistently shows. Studies published in medical journals demonstrate that adequate vitamin D intake reduces fracture risk in children and adults by up to 30 percent. For immune health, research from the Journal of Clinical Immunology found that people with sufficient vitamin D levels experienced fewer respiratory infections during winter months.
The recommended daily intake varies by age. The American Academy of Pediatrics suggests 600 IU daily for children ages 1 to 18 years old, though some experts argue for higher amounts. Many pediatricians now recommend 1,000 to 2,000 IU daily for optimal outcomes.
Sources of vitamin D include fatty fish like salmon and mackerel, egg yolks, fortified milk, and sunshine exposure. However, northern climates, darker skin tones, and limited outdoor time all reduce natural vitamin D production. This explains why supplementation often becomes necessary.
Common vitamin D supplements come in two forms: D2 (ergocalciferol) and D3 (cholecalciferol). D3 proves more effective at raising blood levels, according to research in the American Journal of Clinical Nutrition.
Before starting supplements, parents should consult their pediatrician. A simple