An air ioniser (or negative ion generator or Chizhevsky's chandelier) is a device that uses high voltage to ionise (electrically charge) air molecules.
Vitamin E for hair growth is beneficial because vitamin E has the effect of a scalp massage all the time. It contains valuable antioxidants that help to keep the immune system up and improves circulation to all parts of the body, including the scalp.
Several studies have found that vitamin D may help activate hair growth. However, D is a tricky vitamin. Few foods contain it naturally, and although sitting in the sun for a few minutes a day can help your body produce more of it, many experts advise against it due to the increased exposure to harmful UV rays.