If you suspect a B12 deficiency, a shot can provide a quick and effective solution
Avoid it if you have a known allergy to thiamine, pyridoxine, cyanocobalamin, or cobalt
However, those with a higher risk of not getting enough B12 are vegetarians and vegans, as they get little to no B12 from their diet
A lack of the vitamin during these phases can cause cognitive and developmental delays, neural tube defects, and low rates of weight gain in infants, also known as failure to thrive ( Researchers are still exploring how oral supplements are best used to prevent these side effects
Lethargy Muscle weakness Mood swings Memory loss Tingling in the fingers and toes Weight gain Though B12 is found in many different foods, including meat, eggs, and fortified grains, it may be difficult to get enough of this nutrient from your diet, especially if you are following a specific diet for weight loss
recent guidelines affirm its use (e.g., AHA updates, StatPearls reviews)