Vitamin D is well known for its role in building strong bones and teeth but new research has led the Canadian Cancer Society and the Canadian Dermatology Association to increase their recommendations for Canadian adults, under the age of 50, from 200 IU of Vitamin D to 400 IU daily. Higher vitamin D and calcium levels have been linked to lower risk for some cancers, including colorectal, breast and colon cancers. Sun exposure on bare skin is the major source of vitamin D, but length of seasons, latitude, cloudiness, smog, and sunscreens can reduce UV ray exposure and vitamin D synthesis. Adequate vitamin D in childhood prevents rickets and in adults prevents osteomalacia (soft bones). Vitamin D deficiencies are also linked to muscle weakness and general aches and pains. To minimize health risks associated with UVB radiation exposure, while maximizing vitamin D benefits, supplementation combined with small amounts of sun exposure, is the recommended way to assure optimum levels of vitamin D. Webber Naturals Vitamin D3 400 IU is an excellent way to top up vitamin D requirements. , , Recommended dosage (adults): 12 tablets daily or as directed by a physician.