As the body adjusts to the dosage, they fade
According to clinical resources such as the Mayo Clinic, while B12 is essential for nerve and red blood cell health, theres no strong evidence that injections improve energy or aid weight loss in people without a documented deficiency
oral vitamin B12 replacement When offering oral vitamin B 12 replacement to people with vitamin B 12 deficiency caused, or suspected to be caused, by malabsorption, prescribe a dosage of at least 1 mg a day
(2000) Evidence for the role of megalin in renal uptake of transthyretin
Otherwise, most lipotropic injections should be safe for you unless you have a known allergy to any of the ingredients.
ROBINS-I A Tool Assessing Risk Bias Non-randomised Studies Interventions 355, i4919