Prevents Osteoporosis: Important for keeping bones strong and preventing the bone disease osteoporosis. Vitamin D helps your intestines absorb calcium from the food. For Stronger Immunity: Enhances the body's immune functions through vitamin D receptors located on the most immune system cells. This helps to fight infections and viruses. Strengthens Bones and Teeth: Both by helping your body absorb calcium and by supporting muscles needed to avoid weakness. During Pregnancy & lactation: During pregnancy and lactation, mothers require significant amounts of calcium to pass on to the developing fetus and suckling neonate, respectively. Frequent Fatigue: Excessive fatigue and tiredness may be a sign of vitamin D deficiency. Hair loss Problems: Hair loss can occur when your body lacks the recommended amount of vitamin D. Vitamin D deficiency has been linked to alopecia, also known as spot baldness and a number of other health conditions