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On the other hand, if a vitamin B12 deficiency does occur, it is associated with several undesirable health risks, some of which are as follows: shortness of breath heart palpitations tingling or numbness in the extremities poor balance mood changes incontinence insomnia loss of concentration poor memory chronic fatigue Those who smoke cigarettes, consume excessive amounts of alcohol, or adhere to a vegetarian or vegan diet are at a greater risk of acquiring a nutritional deficiency than younger adults

Mitochondrial protection by resveratrol

CNBC's Nick Wells, Fred Imbert, Tanaya Macheel and Darla Mercado contributed reporting.

Energy tends to respond first, mood and focus follow within a week or so, and the longer-term, structural benefits build quietly over months