10. Joint Stiffness
Joints become stiff when the cartilage that covers the ends of bones starts to wear away. This can happen because of osteoarthritis, rheumatoid arthritis, or other conditions. When the cartilage wears away, bones can rub against each other, causing pain and swelling.
Vitamin D can help reduce joint stiffness by keeping bones strong and healthy. Vitamin D also helps reduce inflammation, which can help relieve pain and swelling in the joints.