It is not a replacement for these foundationsbut rather a potential complement to them
If you're severely deficient, you may be prescribed up to 6,000 IU per day followed by a maintenance dose
Dawes P, Cruickshanks KJ, Marsden A, Moore DR, Munro KJ
What does matter is gastric motility: delayed emptying (which occurs postprandially and during evening hours as part of parasympathetic dominance) can hold the compound in the stomach longer, theoretically extending the time to peak concentration without altering total absorption
Kids need a bit less, but all humans require at least some vitamin B12 each day
NAD+ is a coenzyme found in every cell that participates in hundreds of metabolic reactions