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)

Unlike Erysipelatoclostridium , Lactobacillus was significantly and dramatically increased in 5A-1MQ-treated mice switched from WD to LD relative to their vehicle-treated counterparts and the LD control group

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

Measuring serum biomarkers such as B 12 or MMA is neither helpful nor indicated in assessing or monitoring clinical improvement.38 Base the injection frequency on symptoms, and not on biomarker assessment