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Side effects of vitamin A supplements are rare. Vitamin A toxicity is a rare concern associated with high levels of vitamin A over prolonged periods of time. Symptoms may include nausea, vomiting, headache, dizziness, irritability, blurred vision, and a lack of muscle coordination. [31]
The Vitamin To Avoid Over 50, According to a Longevity Expert ... "Older adults should be careful with vitamin A because it can potentially reduce bone density, as well as cause liver damage or ...
“Vitamin B12 is important for energy levels, red blood cell formation, and cognition, and a vitamin B12 deficiency can cause cognitive changes that can actually mimic dementia,” says Pacheco.
It can be literally life-giving, but so many people aren't getting enough of it.
The causes are vitamin A deficiency during pregnancy, followed by low transfer of vitamin A during lactation and infant/child diets low in vitamin A or β-carotene. [ 22 ] [ 19 ] The prevalence of pre-school age children who are blind due to vitamin A deficiency is lower than expected from incidence of new cases only because childhood vitamin A ...
Preformed vitamin A is fat-soluble and high levels have been reported to affect metabolism of the other fat-soluble vitamins D, [24] E, and K. The toxic effects of preformed vitamin A might be related to altered vitamin D metabolism, concurrent ingestion of substantial amounts of vitamin D, or binding of vitamin A to receptor heterodimers ...
Serum concentrations above 50 ng/mL may be cause for concern. Common, most foods do not contain vitamin D, indicating that a deficiency will occur unless people get sunlight exposure or eat manufactured foods purposely fortified with vitamin D. Vitamin D deficiency is a known cause of rickets, and has been linked to numerous other health problems.
The Office of Dietary Supplements recommends getting 15 micrograms of vitamin D a day. Research suggests that low vitamin D levels may also play a role in other common forms of hair shedding, like ...