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“Preclinical data suggest that cholinergic precursors such as choline or lecithin , increase levels of acetylcholine in specific brain structures, and under certain conditions may enhance cholinergic neurotransmission.”
The American journal of clinical nutrition • 1982 | View Paper
“Consumption of a single meal containing lecithin , the major source of choline occurring naturally in the diet, increased the concentrations of choline and acetylcholine in rat brain and adrenal gland.”