is b12 injection better than pills Are Vitamin Shots Right for You? Vitamin B12 Injections vs. Supplements:

In partnership with folate, B12 enables thymidine production, normalizing reticulocyte counts by 50-60% within 1 week of 1,000 mcg injections, with 80% of cases achieving full hemoglobin normalization (1-2 g/dL increase) within 2 months, per a 2025 WHO meta-analysis (n=2,500)

Then, for eight weeks, the carnitine group received 1,500 mg of oral acetyl-L-carnitine while the other group continued receiving placebo

Once in the blood, B12 is picked up by transcobalamin to be carried to cells throughout the body

Protect lean muscle, which is essential for maintaining a high metabolic rate

In addition, those who take certain medications may be at increased risk for B12 deficiency, per Healthline