Taurine is an amino acid. It is not a stimulant or a hormone. It is often included in energy drinks because it will help increase endurance and prevent muscle cramps. Taurine by itself can not contribute to insomnia.
Taurine has a lot of health benefits associated with it. That's why it's included in N2guard. It increases blood flow and helps prevent muscle cramps and dehydration.
N2guard from n2bm.com contains no hormones, stimulants or banned substances. It is perfectly safe to take near bed time.