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Symptoms of a lack of vitamin B12 are tiredness, lack of energy, focus, and memory or cognitive function impairment all common symptoms also associated with busy, stressful, and hectic lives
Patel, R., & Kumar, S
For this reason, the NIH has not established a tolerable upper intake level for B12
B12 injections are safe and are not known to harm health in any way when taken under the supervision of a medical professional
The type of B12 supplement might matter too
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