Vitamin D is important for receiving normal bones, this has been known since the beginning of the 20th century. The "sun vitamin" can still be a lot regulate more than just calcium metabolism and ensure normal teeth:

DEKRISTOL® 1,000 I.E. Active ingredient: Colecalciferol (vitamin D3). Areas of application: for prevention against rachitis and osteomalacia or In the event of recognizable risk of vitamin D deficiency disease in children, adolescents and adults and for supporting treatment Osteoporosis in adults. Warning: contains lactose and sucrose.