Our Vitamin D Booster Intramuscular Injection is perfect for aiding weight loss, boosting your mood, strengthening the immune system and maintaining healthy bones and teeth. Vitamin D is also great at lowering the risk of certain types of cancer, type 2 diabetes, heart disease and rheumatoid arthritis. Having low levels of Vitamin D can lead to muscle aches, brittle bones, fatigue, poor sleep, hair loss, slow wound healing, weight gain, and reduced cognitive function.