It usually fades within a day or two, and proper technique helps minimize it
B12/Lipotropic injections are ideal for people who: Struggle with low energy levels or fatigue
(PubMed) Is it better for stubborn fat
Vitamin B12 injections begin working almost immediately at a cellular level, though the timeframe for noticeable symptom improvement varies considerably between individuals
To put it in context, nicotinamide has shown signs of liver toxicity only at doses around 3,000 mg per day or higher
Methylcobalamin, vitamin B12 preparations containing benzyl alcohol should be avoided in premature neonates because benzyl alcohol has been associated with gasping syndrome, a potentially fatal condition characterized by metabolic acidosis and CNS, respiratory, circulatory, and renal dysfunction