I'm sitting here in the ER with my husband. We began Day 11 of the 24 Day Challenge today, which commenced our first day of multipacks. The heart palpitations, nausea, dizziness, and facial rash was severe enough that my husband requested 911 assistance. ER doctor is attributing his response to an overload of niacin. I did a search on this while waiting in the ER, and found a number of similar responses to the massive amounts of niacin in the vitamin pack/Spark combo. We purchased our products through an Advocare rep and have been coached through the process. However, no mention of possible side effects, though they are clearly documented online. Bottom line: It really is a good idea to check with your physician before beginning any diet or fitness program. Lesson learned, and Challenge terminated.

I've used this product for several years for a trust tax return. It is easy to use and does a good job. I have two complaints though:

I really had high hopes for this vitamin for my daughter's skin, especially with all the glowing reviews. But after going through two full bottles, we have not seen any change in my daughter's skin. I know nothing works for everyone, but we are disappointed, as the ingredients seemed good and useful for clearing skin.