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However, its common for blood tests to reveal inaccurate information regarding B12 levels since a high percentage is stored in the liver and not always revealed through testing (for example, taking large amounts of folic acid has been found to mask vitamin B12 deficiency in some patients)

The occurrence of insomnia symptoms was found to be linked with female gender, hypertension, and insufficient vitamin B12 levels (Table 4)

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In older people, a B12 deficiency usually happens as a result of insufficient levels of either stomach acid or intrinsic factor that limit absorption