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KZ, LX, HT, YH, and YX provided assistance with experiments

The answer can be unclear, especially if you have a supply

A randomized placebo-controlled trial of nicotinamide riboside in older adults with mild cognitive impairment

Vitamin B12 is an essential nutrient that supports red blood cell production, nerve function, and energy conversion

Use is restricted to qualified professionals in properly equipped laboratories

I wasnt able to find any reliable evidence or details regarding whether a mild B12 deficiency can exacerbate B12 malabsorption, but the possibility raises concerns
