Do humans produce vitamin c
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Do Humans Produce Vitamin C?
Human Inability to Synthesize Vitamin C
Humans, unlike most other mammals, cannot synthesize vitamin C (ascorbic acid) due to the functional loss of the gene coding for L-gulonolactone oxidase, an enzyme crucial for the biosynthesis of vitamin C Padayatty2016Mastrangelo2017Paciolla2019+1 MORE. This genetic mutation necessitates that humans obtain vitamin C through their diet, primarily from fruits and vegetables Carr2013Padayatty2016Carr2017.
Dietary Sources and Bioavailability
Vitamin C is an essential water-soluble micronutrient that must be ingested through dietary sources such as fruits and vegetables Carr2013Carr2017. Both synthetic and food-derived vitamin C are chemically identical and have similar bioavailability in humans, although the presence of other nutrients and phytochemicals in natural sources may influence its absorption and utilization .
Physiological Roles of Vitamin C
Vitamin C plays multiple critical roles in human physiology. It acts as a potent antioxidant and a cofactor for various enzymes involved in collagen synthesis, neurotransmitter production, and immune function Padayatty2016Carr2017Nusgens2001. It is essential for maintaining the integrity of the extracellular matrix, supporting immune defense mechanisms, and regulating gene expression Carr2017Nusgens2001Traber2011.
Health Implications of Vitamin C Deficiency
A deficiency in vitamin C can lead to scurvy, a condition characterized by impaired collagen synthesis, leading to symptoms such as bleeding gums, joint pain, and anemia . Additionally, vitamin C deficiency can impair immune function, making individuals more susceptible to infections . Chronic deficiency may also negatively impact metabolic health, as evidenced by studies in humanized mouse models .
Conclusion
Humans do not produce vitamin C and must rely on dietary intake to meet their physiological needs. This essential nutrient supports numerous bodily functions, including antioxidant defense, collagen synthesis, and immune response. Ensuring adequate intake of vitamin C through diet is crucial for maintaining overall health and preventing deficiency-related conditions.
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Most relevant research papers on this topic
Synthetic or Food-Derived Vitamin C—Are They Equally Bioavailable?
Synthetic and food-derived vitamin C have no significant differences in bioavailability, but animal studies show differences depending on study design and body compartments.
High Doses of Vitamin C and Leukaemia: In Vitro Update
High doses of vitamin C show potential in vitro as a powerful anticancer agent against myeloid leukaemia.
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