Taurine is used in many applications. In the pet food industry, especially in cat food production, it is an essential ingredient for preventing blindness in cats. Taurine is used both in energy drinks and in nutritional supplements mainly for the fact that is supposed to regulate heartbeat and muscle contractions, water balance, energy levels and levels of neurotransmitters in the brain. Taurine is also sold into the personal care industry where it has been suggested that it can help maintain skin hydration levels.