Well nothings happened yet, acute. That doesn't mean weeks, or months after the 10/23 OP, long term. I am just positing what I think and have researched. Take it for what you want. I am not trying to be negative. I was just thinking that perhaps a more natural caffeine derivative and in the case of coffee and Yerba matte possible beneficial results can be gleamed! Google Scholar and/or pubmed it. Even some narrowing on Google will show some descent points of not only the synergistic effects of coffee and Yerba but many of the antioxidant polyphenols and other compounds that are beneficial without the nasty biproducts of these energy drinks. Polyphenol content, in vitro bioaccessibility and antioxidant capacity of widely consumed beverages. - PubMed - NCBI I don't know why you would think I would waste our time. If I didn't think there are better alternatives. Peace I