Cowan, Zina Jarrah, and Diana W
S Afr Med J 51:208209 Tanaka E, Yamazaki K, Misawa S (2000) Update: the clinical importance of acetaminophen hepatotoxicity in non-alcoholic and alcoholic subjects
Some individuals report changes within days or weeks, while others may require a longer period of treatment
People with mild B12 deficiencies experience changes in B12 effectiveness yet severe deficiencies need extended treatment time or stronger doses to produce noticeable results
Early symptoms of vitamin A deficiency include night blindness, and severe deficiency may eventually lead to total blindness
Reported effects are generally mild injection-site reactions, fatigue, lightheadedness after a dose