The symptoms of B12 deficiency can vary widely and may include fatigue, weakness, tingling or numbness in the hands and feet, difficulty concentrating, and even mood disturbances
Environ Res
[2] Oral B12 supplementation generally takes longer to produce effects , with patients often noticing energy improvements within two to four weeks
It is usually present in animal products, especially dairy products, poultry, eggs, and fish
Never increase more than 100mcg at a time, and allow at least one week at each dose before further adjustment
Temporomandibular joint (TMJ) dysfunction Abnormal jaw mechanics, bruxism , or joint irritation can maintain persistent facial pain