"NAD+ beneficially enhances eight core cellular anti-aging mechanisms.
When these cell functions are impaired, the consequence is accelerated aging that contributes to disorders as diverse as Alzheimer’s and osteoporosis.
Restoring cell NAD+ levels has been shown to preserve youthful function—and even reverse some age-induced deterioration."48.
Nicotinamide riboside has been shown not only to restore NAD+ levels in tissues, but also to provide more NAD+ activity than can be obtained from diet alone.
"in particular, the researchers compared the ability of all three NAD+ precursor vitamins-NR,niacin, and nicotinamide-to boost NAD+ metabolism and stimulate the activity of certain enzymes,which have been linked to longevity and health benefits. The
study showed for the first time that oral NR is superior to nicotinamide, which is better than niacin in terms of the total amount of NAD+ at an equivalent dose. NR was also the best of the three in stimulating the activity of sirtuin enzymes. However,
in this case,, NR was the best at stimulating sirtuin-like activities followed by niacin, followed by nicotinamide." 49.

End of Long Quote

Thus, oral nicotinamide riboside, which is available over the counter in pill form, is the best supplement to take orally to increase NAD+ levels.

"High niacin foods include fish, chicken, turkey, pork, beef, mushrooms,brown rice, peanuts, avocados, green peas, and avocados. The current dail value (%DV) for niacin is 16 mg." 51.
"Fortunately, NMN is found naturally in many foods. Below are the six foods highest in NMN: 1. Broccoli ;2. Cabbage; 3. Cucumber; 4. Endamame; 5. Avocado; 6. Tomato." 50
Good sources of alanine are meat, poultry,eggs, diary products, and fish. Some protein-rich plant foods like avocado also supply alanine." 52.

Therefore, given the aforementioned, it is imperative to increase the bloods concentrations of L-alanine, Niacin,Nicotinamide riboside (NR) and alanine amino transferase in order to minimize morbidity and mortality in humans, especially in the elderly.
"NAD+ beneficially enhances eight core cellular anti-aging mechanisms.
When these cell functions are impaired, the consequence is accelerated aging that contributes to disorders as diverse as Alzheimer’s and osteoporosis.
Restoring cell NAD+ levels has been shown to preserve youthful function—and even reverse some age-induced deterioration."48.
Nicotinamide riboside has been shown not only to restore NAD+ levels in tissues, but also to provide more NAD+ activity than can be obtained from diet alone.
"in particular, the researchers compared the ability of all three NAD+ precursor vitamins-NR,niacin, and nicotinamide-to boost NAD+ metabolism and stimulate the activity of certain enzymes,which have been linked to longevity and health benefits. The
study showed for the first time that oral NR is superior to nicotinamide, which is better than niacisn in terms of the total amount of NAD+ at an equivalent dose. NR was also the best of the three in stimulating the activity of sirtuin enzymes. However,
in this case,, NR was the best at stimulating sirtuin-like activities followed by niacin, followed by nicotinamide."

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