Brain Formula - Pure pharmaceutical grade Phosphatidyl Serine, Ginkgo Biloba & Pregnenolone. The most powerful brain cell nutrient, brain herb and brain hormone yet discovered. Rated a best buy for customers. Three products for the price of one. Pregnenolone is a chemical derivative of cholesterol and is technically considered a steroid like DHEA. Pregnenolone is used for enhanced brain function, memory deficiencies, Alzheimer's disease, mood disorders, chronic fatigue, cholesterol levels, lupus, immune weakness, multiple sclerosis, psoriasis, rheumatoid arthritis and stress.