When buying supplements that you have never heard of before you should always check around the web for supplement reviews websites to see what others are saying about them. I usually like to browse these reviews sites just to see what people are saying about products as well.

You can also check muscle forums, as a lot of people post “supplement journals” where they document their progress while trying a new supplement for the first time. Always a good read. I recommend checking out these supplement reviews sites:

1. 4 Supplement Reviews
   The biggest supplement reviews site on the web. They have thousands of reviews and a lot of products available for review.
2. Muscle and Strength Supplement Reviews
   Another good supplement reviews resource. Not as many products as 4SR, but some good opinions from experienced weight trainers.
3. Supp Reviews at Critical Bench
   Critical bench is a solid site and they have some good articles on supplements.

There you go, tons of resources for good supplement reviews!