For any of you interested:
Cholidin is a nutritional supplement (not a prescription item) that contains choline and several vitamins and minerals.
Choline is the "active ingredient" but the combination seems to make the supplement work.
Wikipedia had a good description of
Choline.
In 1975, scientists discovered that the administration of choline increased the synthesis and release of acetylcholine by neurons. These discoveries lead to the increased interest in dietary choline and brain function.
Acetylcholine is a major neurotransmitter that allows brain cells to communicate with each other.
Things in the diet that contain choline are eggs and fatty meats, so deficiencies can result from diets limiting these items.