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Another study shows that NGF helps with communication and preservation of sympathetic, sensory and forebrain cholinergic neurons in the central and peripheral nervous systems.(4) Cholinergic neurons are neurons that send messages using the neurotransmitter acetylcholine in the central and peripheral nervous systems

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Gingko biloba 14,15 However, these were very small studies, and there were a couple of contrasting studies that found no effect on visual field or contrast sensitivity, as well as one that found no change in blood flow