Is there a way for the consumer to check if their supplements are working or not!

Is there a way for the consumer to check if their supplements are working or not non invasively?

I have a website in which I Review each supplement personally. Its a good way to tell how good each supplement has worked and whether it is worth the money or not. Im just doing it for fun and its totally free. Please check out my site at www.bestsupplementreview.com , please leave me some feedback and tell me how to make it better. Also I will review any supplement so contact me if one comes to mind. Thank you!