NOW® Magnesium Inositol Relax Powder combines magnesium and inositol, two nutrients that support relaxation and a normal mood.* Magnesium is a mineral that is critical for metabolism, energy production, nerve impulse transmission and more.* Inositol is a member of the B-complex family that's found in all cell membranes, especially in the brain and central nervous system, where it plays an important role in neurotransmitter signaling.* Natural color variation may occur in this product. This product is sold by weight not volume.