Vitamin D Calculator
Estimate your recommended daily Vitamin D intake based on your personal risk factors.
About Vitamin D
Vitamin D is essential for calcium absorption, bone health, and immune function. Most people get Vitamin D from sunlight exposure, but factors like skin tone, latitude, and time spent outdoors significantly affect how much your body produces. The NIH recommends 600 IU/day for most adults and 800 IU/day for those over 70.
Did You Know?
- Darker skin contains more melanin, which reduces Vitamin D synthesis in sunlight — requiring longer sun exposure or higher supplementation.
- People living north of 50° latitude may not produce any Vitamin D from sunlight during winter months.
- Vitamin D deficiency is estimated to affect over 1 billion people worldwide, making it one of the most common nutritional deficiencies.