Vitamin D is essential for bone health 🦴, immune function 🛡️, and muscle strength 🏋️.

Deficiency is common and affects women 👩‍⚕️, young adults 🧑‍🎓, and non-Hispanic Black Americans. Main sources include sunlight ☀️, oily fish 🐟, eggs 🥚, and fortified foods 🥛.

Recommended intake is 600-800 IU/day 💊.

Studies show mixed results 📊, but it may help with cancer prevention 🎗️, autoimmune diseases 🧬, and cognitive function 🧠.

Excessive intake ⚠️ can cause kidney stones 🩺 and hypercalcemia.