Its important to switch injection sites to avoid problems
doi:10.3390/ani10101855
Direct Dosage: A single B12 injection often delivers a much higher dose directly into the system than a typical daily oral tablet, particularly when considering the limited absorption rate of the latter, contributing to their perceived and actual strength. However, for individuals with mild dietary deficiencies and no underlying absorption problems, high-dose oral B12 supplements (e.g., 1000-2000mcg daily) can sometimes overcome the need for intrinsic factor by allowing for a small amount of passive absorption, eventually raising levels, though this method is less predictable and slower than direct injection
In many cases, individuals with B12 deficiency may receive injections once a week for several weeks, followed by less frequent maintenance injections, such as once a month
"Vitamin B12." Britannica
The above-mentioned brands are some of the most reliable methylcobalamin injection brands in India, recognised for their high-grade production standards, clinical efficacy, and doctor acceptance