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If you take B12 supplements and your level is high, thats almost always the explanation
Purchasing or using it outside this framework is not legally sanctioned and carries significant safety risks
In certain regions of the world, marginal or subclinical vitamin B 12 deficiency may be fairly common in other age groups as well, including children, premenopausal women, and pregnant women, primarily due to low intake of animal-source foods (reviewed in 5)
Studies show that chronic stress, anxiety, and depression can cause your NAD+ levels in your body to prematurely deplete, causing sleep disturbances, cognitive impairments, and worsening mood problems
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