are vitamin b12 injections effective | Energy Boost Vitamin B12 Injections: Boost Energy
Description
Seems it may apply to a body that has a restrictive diet by choice

10.1038/s41598-018-26956-7 87 LiuM.LiL.ChuJ.ZhuB.ZhangQ.YinX.et al (2015)

The truth is that oral supplements only deliver around 50% of their nutrient count into your body

They might have decreased kidney function, drug interactions, and more malabsorption issues
For individuals seeking better absorption with less digestive strain, liposomal Vitamin B12 provides an advanced delivery method that supports consistent nutrient uptake