What are supplements used for and what supplements should I take?

http://marchildebrand.com/nutrition/

What are supplements used for and what supplements should you take? Click the link above for some detailed reviews, or check out the playlist here to check them out on video.

https://www.youtube.com/playlist?list=PLqf546uEem0gFZf4qzLAMKa72D-TSfRlP