can b12 injections harm your kidneys Are Safe? Side Effects & Risks Explained Are B12 Shots Safe? Royal

(2016) Effects of acetyl-L-carnitine and methylcobalamin for diabetic peripheral neuropathy: A multicenter, randomized, double-blind, controlled trial

18 Table 4 Time to Improvement of Abnormalities in Vitamin B12 Deficiency After Initiation of Treatment A 2005 Cochrane review involving 108 patients with vitamin B 12 deficiency found that high-dose oral replacement (1 mg to 2 mg per day) was as effective as parenteral administration for correcting anemia and neurologic symptoms

Either way, the 0.75 mg incremental dose is very well tolerated

[1] [3] Both treatments are injectable therapies but serve entirely different clinical purposes