This article deliberately avoids naming a specific number, because self-applying a generic figure ignores the personalization that safe dosing requires
Youre not stuck with it
Medical References Wilding JPH, Batterham RL, Calanna S, et al
How fast depends on how low your levels were and your overall health
Preventing Deficiency and Supporting Mental Health Foods Sources of Vitamin B12 Meat, poultry, and eggs Beef Fish (trout, salmon, tuna, and sardines) Dairy products Fortified foods, like cereal, non-dairy kinds of milk, and soy products Nutritional yeast The best sources of vitamin B 12 include liver, beef providing 60 mcg for 3 ounces, and clams with 84 mcg for 3 ounces