Vitamin D3: The Essential Nutrient for Strong Bones, Immunity, and Overall Wellness

# Vitamin D3: The Essential Nutrient for Strong Bones, Immunity, and Overall Wellness

## Summary

Vitamin D3 (cholecalciferol) is a fat‑soluble nutrient your skin makes when it gets sunlight. You can also get it from animal foods like fatty fish, egg yolks, and from supplements. D3 is the most effective form for raising your body’s vitamin D levels. Vitamin D3 helps your body use calcium and phosphorus, which keeps bones and teeth strong. It also supports the immune system, helps muscles work properly, and may influence mood and brain health. Over time, good vitamin D levels contribute to heart and overall metabolic health.

## Benefits

When sunlight (UVB) hits your skin, it starts making D3. That D3 travels to the liver and becomes 25‑hydroxyvitamin D (the form measured in blood tests). The kidneys and other tissues then convert it into the active hormone your body uses. Healthy digestion and some dietary fat help with absorption from food or supplements.

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