Tag: B12 test results

According to the National Institutes of Health (NIH), a vitamin B12 deficiency, characterized by serum levels below 200 picograms per milliliter (pg/mL), affects a significant portion of the adult population. A critical level represents a severe stage of this deficiency that can lead to profound and potentially irreversible health complications.

According to a systematic review published in *ScienceDirect*, high plasma B12 concentrations have been consistently associated with liver cancer, among other conditions. While excess supplementation is the most common cause, you should be worried if your B12 is high in the absence of supplementation, as it can indicate an underlying medical condition.

According to the National Institutes of Health, while serum B12 levels over 250 pg/mL are often considered sufficient, experts increasingly focus on a higher range for optimal function. Understanding what is an optimal vitamin B12 level can help you move beyond merely avoiding deficiency to supporting your best neurological, metabolic, and energy health.

According to the National Institutes of Health, approximately 3.6% of U.S. adults aged 19 and older have a vitamin B12 deficiency, with rates rising significantly among older adults. Understanding what level of vitamin B12 is too low is crucial for identifying this potentially serious condition and its widespread health impacts, which can range from fatigue to permanent nerve damage.