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Older adults may aim to maintain B12 levels as absorption naturally declines with age
You can read the who-and-how in this New York Times article
Dosing Example: Let's say your protocol requires a 1 mg dose
[14] While the effectiveness of this treatment is still being studied, the low risks and promising results make it worth trying if your doctor recommends it
NAD+ levels decline by roughly 50% every 20 years, and this depletion is both a consequence and a driver of aging
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