Why is vitamin d important?

Bone health: Vitamin d is important for bone health, improve and prevent cardiovascular disease, reduce the risk of cancers and overall general well-being.

Omnipresent: Traditionally, vit d has important role in bone health but is increasingly recognized as a hormone with role in various body systems including skin, immunity, etc.

Vitamin D & Uveitis: Association of Low Vitamin D Levels with Noninfectious Anterior Uveitis The data showed that the odds of developing uveitis were 4% lower for every 1-ng/mL increase in vitamin D levels. Though the authors conclude there is no confirmation of a causal effect between the two, it supports the growing body of literature. http://jamanetwork.com/journals/jamaophthalmology/article-abstract/2594012