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Description
Dosing regimens have ranged from 350 g per week (in vegetarians) to 2000 g per day in a study including patients with pernicious anaemia, with the most common daily dose being 1000 g per day

You cant prevent pernicious anemia from occurring

Aging reduces NAD+ synthesis pathways while increasing consumption by enzymes like CD38 and PARPs, activated by inflammation and damage.[13][15] CD38, an immune-related enzyme, ramps up with age, breaking down NAD+ precursors

First, it should not be done on your own
