Key Features Vitamin D3 helps the body absorb calcium better. Hence, vitamin D3 promotes healthy bones, teeth, and immune system and muscle function. Getting the right amount of vitamin D, calcium, and phosphorus is important for building and maintaining strong bones. Vitamin D is used to treat and prevent bone disorders. The body makes vitamin D when the skin is exposed to sunlight. D with calcium to treat or prevent bone loss Overview 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. This has a severe negative effect on the quality of life. Hairloss 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.