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Beginner Protocol (5 mg/week) Dose: 5 mg subcutaneously, once per week

However, vitamin B 12 deficiency does not generally develop until after at least two-to-three years of continuous therapy (137-139)

PMID: 27413170

Elderly people due to impaired intestinal absorption and children, premenopausal women, and pregnant women whose diets are low in animal foods are all at increased risk

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