Should I take vitamin D now there’s less sun, or for bone or immune health?

BLUF

Vitamin D is vital for bone, muscle, and immune health; yet deficiency is common despite sunlight. Most people get enough from sun exposure, but supplements may help those with certain conditions or confirmed deficiency.

Learning Outcomes 

• Explain the biological role of vitamin D.
• Identify causes and consequences of vitamin D deficiency.
• Evaluate appropriate use of vitamin D supplementation, including potential risks.