Xtend Pre-Workout Supplement:
This supplement has been on of my favorites for years. It really provides an energy boost without giving you a jittery feeling. A full serving before your workout is advised, and on off days, a serving in you water throughout the day. Unfortunately, I recently learned that something in the formula is linked to cancer. I have since dropped use of the product. Now, I go without a pre-workout supplement training days. I know there are plenty of other products on the market that serve the same function, however, over the years, I have found that I can handle most workouts without a pre-wo supplement.
Old rating: *****
New rating (after finding out about possible cancer-causing formula): **