Factors such as your metabolism, genetic predisposition, lifestyle habits (like diet, exercise, and sleep), and individual response to B12 can all influence the timeline for experiencing improvements
When to Contact a Healthcare Professional Although occasional missed doses are usually manageable, medical advice may be helpful if someone experiences: repeated missed doses severe side effects after restarting medication uncertainty about dosing schedules Healthcare professionals can provide personalised advice based on the specific medication being used
Very rarely, allergic reactions or mild diarrhea can occur
Note that the Pei 2024 meta-analysis did find improvements in hair thickness, so this may depend on the specific protocols and topicals used
Individuals with seizure disorders should consult a physician before use some carnitine forms have reported interactions with valproic acid and other anti-seizure medications