Most users begin noticing results in as little as 2-3 weeks when it comes to muscle gains. However, a majority of them experience an increase in their strength within the first few days itself. At any time, you should keep in mind that these supplements are going to work only when you combine them with intense training and a healthy diet.
Even though you should be able to see results in 2-3 weeks, you should allow at least 4 weeks to see the results. Furthermore, it is recommended that you go for an eight-week cycle for the best results.