Vegetarians respond that NADH itself is not processed efficiently by the body, which the article excerpt posted above indicates with: "[the stomach] incidentally also destroys most of the NADH present in food anyway." So they claim that one has to take supplemental forms of NADH to get any significant bioavailable amount. However, that didn't make sense to me, given that the info that Dorothy at the Giveittomeraw forum provided indicated that NADH is essential to humans in numerous ways and given that supplement pills are a recent invention. If it's true that NADH is essential, then our ancestors would not have survived if there wasn't a way for them to obtain enough of it from natural foods either directly or from the precursors to make NADH in the body, so I searched further to find out what those precursors are.
It turns out that NADH is made from niacin (vitamin B3) and tryptophan:
Nicotinamide Adenine Dinucleotide Nadh"NADH Food Sources: NADH formation requires niacin (vitamin B3) and tryptophan, therefore an adequate supply of this vitamin and amino acid is necessary." (NADH Introduction, 2003,
http://www.supplementnews.org/wiki/nicotinamide_adenine_dinucleotide_nadh)
So what are the food sources of niacin and tryptophan?
Foods rich in niacin (vitamin B3;
http://www.whfoods.com/genpage.php?tname=nutrient&dbid=83) :
Chicken breast, roasted
Tuna, yellowfin
Salmon, chinook
Calf's liver, braised
Turkey
Halibut, baked/broiled
Lamb loin, roasted
Venison
Crimini mushrooms, raw
Sardines
Foods rich in tryptophan (
http://www.whfoods.com/genpage.php?tname=nutrient&dbid=103):
Chicken breast, roasted
Turkey
Tuna, yellowfin
Soybeans, cooked
Beef tenderloin, lean
Lamb loin, roasted
Halibut, baked/broiled
Shrimp, steamed/broiled
Salmon, chinook
Snapper, baked/broiled
Once again animal foods dominate the list, and I doubt that it's necessary to cook them to get the niacin and tryptophan.