 There is no unified consensus on the dose of Vitamin D supplementation. Neither is there agreement on definitions of sufficiency with some researchers targeting levels of serum 25OHD of 20ngml and others aiming for levels above 30ngml. The Institute of Medicine IOM 2010 guidelines, aiming for a lower serum 25OHD target of 20ngml, advocates maintenance doses of 600 IUday in Postmenopausal women aged 51-70 and 800 IUday for those aged 70 years. On contrary, the Endocrine Society 2011 guidelines state that maintenance doses up to 1500-2000 IUday may be required to attain a higher optimal target of 30ngml. On addition, the 2014 National Osteoporosis Foundation Guidelines recommended that the Vitamin D level should be brought up to approximately 30ngml, and to maintain at this level taking into account those with limited sun exposure, obese and dark skin individuals, the daily requirement ranges from 800-2000 IUday. 