Acorus Calamus. Vacha is used to improve cognitive abilities such as memory, voice and intelligence. Its main benefits appear on the brain, vocal cord, stomach, liver, lungs and uterus. Vacha assists with treatment of memory loss, Alzheimer's disease, anxiety and depression. Alongside this, it is used to treat loss of appetite which is associated with mental anguish. The herb also lowers blood pressure and is an antiseptic.