Lecithin helps maintain normal biological function, notes Drugs.com. This natural substance is a vital cellular component present in all organisms. Lecithin can also be derived from various food sources.
Lecithin functions as a precursor to acetylcholine, a chemical that carries and relays neural impulses from the brain to different parts of the body. Medicines containing lecithin are used to treat disorders related to brain dysfunction, such as Alzheimer's disease, dementia and memory loss associated with advancing age. However, lecithin is likely ineffective for these conditions, notes WebMD.
Lecithin in medicated form is possibly effective in treating liver disease by causing a drop in fat build-up in the liver of some patients. As of 2015, there is insufficient clinical evidence to suggest that lecithin treats dermatitis, eczema, high cholesterol, manic-depressive disorder, anxiety, stress or Parkinson's disease.