L-carnitine deficiency has been demonstrated to reduce the availability of energy in the liver and is associated with impairments in various aspects of energy metabolism, including utilization and accumulation of carbohydrate and lipids in liver cirrhosis (7,8)
Diabetes 47 , 764769 (1998)
Some formulations may start at lower doses and gradually increase to reduce side effects and optimize tolerance
They also that note it can take up to 4 weeks to see results
Di Pascuale MA, Espana EM, Liu DT, Kawakita T, Li W, Gao YY, Baradaran-Rafii A, Elizondo A, Raju VK, Tseng SC (2005) Correlation of corneal complications with eyelid cicatricial pathologies in patients with Stevens-Johnson syndrome and toxic epidermal necrolysis syndrome
So if youre being treated for vitamin B12 deficiency, you dont need to worry that the doctors will overshoot