Drop AOD in the comments (for your convenience) and well DM you the link + a few extra resources
Lighter individuals may achieve good results at lower doses (300-350mcg)
Although you may eat plenty of B-12-enriched food, your body may not absorb it or use it efficiently due to aging, alcohol intake, and pollutants from the environment, all of which can take a toll on your body and digestion

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References: Misra M
Knowing what triggers them can ease unnecessary worry