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APP, PSEN1, and PSEN2 mutations in early-onset Alzheimer disease: A genetic screening study of familial and sporadic cases

You can buy generic multivitamins at a big box store, or you can spend a little extra to get supplements made with quality ingredients, no artificial fillers and meaningful doses of bioavailable nutrients

It is also worth noting, however, that much of what Johnson does is based on well-accepted science

4.3.1 Acetylcholine Acetylcholine (ACh), the primary excitatory neurotransmitter of ENS cholinergic neurons, is synthesized by choline acetyltransferase (ChAT) and modulates GI functions through muscarinic receptors (M2/M3)

Journal of Endocrinology and Metabolism , 4 (3), 64-77