ZCA Stack comes from the formerly popular ephedra based product ECA Stack. They took their time in reformulating, longer than most others, because they wanted to make sure that they would not have to reformulate again, and they wanted to make sure that users would actually see results without side effects or any other issues that you will find with other formerly ephedra based products.

Ingredients: ZCA Stack ingredients include Advantra-Z, caffeine, and white willow.

Effectiveness: This simple formula is actually extremely effective. They had a great formula before, and this time around they just replaced the one problem ingredient, ephedra. They found an ingredient, Advantra-Z, that not only matches but could possibly surpass ephedra without serious side effects. The results speak for themselves.

Side effects: ZCA Stack side effects include irregular heartbeat, chest pain, dizziness, headache, nausea, insomnia, mood swings, cramping, constipation, diarrhea, tension, anxiety, and high blood pressure if you are sensitive to caffeine.

Price: $59.99