Scurvy on a diet devoid or nearly devoid of vitamin C, had blood levels of vitamin C too low to be accurately measured when they developed signs of scurvy, and in the Iowa study, at this time were estimated (by labeled vitamin C dilution) to have a body pool of less than 300 mg, with daily turnover of only 2.5 mg/day. The vast majority of animals and plants are able to synthesize vitamin C, through a sequence of enzyme-driven steps, which convert monosaccharides to vitamin C. However, some mammals have lost the ability to synthesize vitamin C, notably simians and tarsiers.
Vitamin D deficiency in Australia Australian Standard 2.4.2. It is mandatory for all food manufacturing companies producing table spreads like butter and margarine to have no less than 55 mg/kg of vitamin D, as a response to a growing public health requirements. In response to recent advances, public policies are being reconsidered to ensure vitamin D is evidently being measured. With the vitamin D deficiency resurfacing the nutrient reference value guidelines were established, in turn creating the dietary vitamin D recommendations. The dietary vitamin D guidelines are assuming limited exposure to UVB sunlight are: Infants, Children and Adults < 50 years: 5 µg/day Adults >