* Dietary Supplement * Resets Sleep-Wake Cycle * Recommended by Dr. Michael Murray * Purity & Potency Guaranteed Natural Factors Melatonin supplement can help to provide a more restful and natural sleep without any drowsy side-effects that sometimes result from taking chemically produced pharmaceutical sleep aids. All Natural Factors products are manufactured in accordance with the Government of Canada"s Good Manufacturing Practices (GMP), among the highest standards in the world.