route of vitamin b12 injection sites + How to use B12 Shots Safely B12 Shots at Home: How,

By your late 40s, most women have early jowling, which occurs because of volume loss in the cheek above (which is why cheek filler can actually remove jowls for women in their 40s and 50s)

This pattern warrants reassessment rather than automatic dose escalation

In such cases, B12 injections bypass the gastrointestinal tract, directly increasing vitamin levels and helping alleviate symptoms like fatigue and neurological issues

One possibility is that the injection is not fully absorbed by the body, leading to inadequate distribution of the vitamin

[66] The Japan National Institute of Health and Nutrition set the RDA for people ages 12 and older at 2.4 g/day