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If you are taking any anti-infective drugs, such as amoxicillin or erythromycin, make sure to let laboratory personnel know prior to testing

Injections only enter the picture if a vegan has progressed to symptomatic deficiency, or has an absorption problem unrelated to diet

However, make sure your B12 is from a 3rd party source

Studies confirm 50% drops by midlife, linking to aging symptoms.[1][9] Restoring NAD+ has been shown in animal studies to improve lifespan and healthspan, with human trials indicating benefits in muscle function and cognitive performance

This means B12 deficiency is real and underdiagnosed, but it is not universal and not everyone experiencing fatigue has a B12 problem