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You might be an ideal candidate if you're following a vegan or vegetarian lifestyle (plants don't naturally contain B12), or if you've been diagnosed with pernicious anemia (where your body attacks the cells needed to absorb B12)

An additional difficulty in diagnosing cobalamin deficiency occurs in patients taking oral vitamin B12 supplementation who do not have absorption disorders

Squires J, Bricker D

Improvements in chronic fatigue due to B12 injections can be noticed as early as one week

[3] These systems are central to mood regulation, motivation, and executive cognitive function

We used to be able to B12 in vegetables as it was present in the soil, but agricultural practices have diminished the levels of B12 in our soil to the point where it is almost non-existent