In the Cantox Report 9 studies were conducted on Ephedra. Each study ran for 8 weeks. These studies looked at many indicators such as heart rate, blood pressure and any adverse side effects. It was concluded that 150mg of ephedrine alkaloids per day was the lowest observed side effect level. In other words, the lowest observed adverse effect level is 50 per cent higher than the recommended maximum daily dose of 100mg per day of ephedrine alkaloids you will see on ephedra base diet pills.