I am super careful when it comes to any type of supplement. Most are not proven or prove to have more disadvantages than advantages (such as heart palpitations and such). A friend recommended this product to me and I researched the hound out of it. I was impressed with what I discovered and decided to buy one to try.To be fair, I�ve only used it twice: one for a pre-workout and the other just for a pick-me-up on a particularly sluggish day. I�ve been so impressed thus far and am hopeful what I am experiencing so far is not just a placebo effect. First, the cost is affordable for my budget. Second, this stuff mixes well with water so I don�t have to bring some other liquid to mix it. Third, it tastes great. I ordered the Fruit Punch and it is delightful and refreshing. Last, certainly not least, it produces exactly what it promises � the energy to get me though a workout as well as the energy to make my sluggish day so much better.While I am so far loving these results, I am still hesitant to just blanket recommend it to just anyone. I certainly recommend a slow introduction, as in taking just half what they recommend for a bit. No need to take the full dosage if half works. I also recommend to use it only when you need it. I only used it twice thus far because I haven�t needed it the other times. I don�t even think the product recommends it daily (I might be wrong on that though).My biggest satisfaction is that it has not effected my digestive system. It seems to fade away without any known impact.Note: I should let the reader know I am not a health expert. I�m just a guy trying to improve my health and gain some positive energy (I work a 40 hour job, I�m a Widower of 2 years, & I�m the Father to an adult son). I don�t take any other supplement outside of a daily men�s vitamin.Good luck and I hope this product is good for you.