We can’t specify when you should or shouldn’t start taking a supplement, but you can take nervogen Pro as soon as you start experiencing nerve pain so as to both calm the nerves, so to say, and treat your condition with an all-natural nerve pain supplement which will help you tremendously. Keep in mind that you should consult with your doctor or physician before taking any drugs or supplements so that you can avoid the severe health problems that might come with mixing two or more drugs.