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A common pattern is a Myers Cocktail (which already has B12) once or twice a month, plus a quick standalone B12 shot in between if energy dips during a heavy stretch

The body can do this but many times the reason the deficiency exists is because there is some venerability with formation of methyldonors (like methylcobalmin)

B12 injections replenish your levels quickly, offering a safe and effective method to restore your health

I will say I also do not wear out so easy when Im doing my workouts, overall I feel really great, and about to be ordering my second month

Should I Worry

Each takes a different approach to the same fundamental problem, and understanding their distinct mechanisms helps you determine which one, or which combination, fits your situation