Lecithin

Lecithin is a fatty substance (phospholipid) found in animal and plant tissues, acting as a natural emulsifier that mixes oil and water, used in foods to smooth texture and prevent sticking, and in supplements for its choline content, supporting cell membranes and nerve function, though research on health benefits like memory is mixed, notes WebMD. Commonly sourced from soy and egg yolks, it's a key part of cell structures, aids fat metabolism, and is considered safe by the FDA, but supplements aren't as regulated as food additives.