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Several Lactobacillus species require nicotinamide or nicotinic acid for growth 94

Apr 21 2020;141(16):e750-e772

[80] [82] Animal-derived food sources with a high concentration of vitamin B 12 include liver and other organ meats from lamb, veal, beef, and turkey

Terminal illnesses such as cancer with high mortality rates and distrust in the medical system can also be factors

Internalization of the IF and vitamin B12 complex results in the release of the complex from its receptor and passage into the bloodstream [9]