Wake up and be bearsome today And not with a cup of coffee, but with the natural medicinal plant guarana, known as a natural coffee substitute. South American natives have been using guarana as a medicinal plant for centuries. The superfood has five times the amount of caffeine compared to a coffee bean. However, the caffeine contained in it only develops gradually and can therefore have a longer effect. The effect of our energy bears is also supported by the amino acids L-citrulline, L-tyrosine and vitamin B6. L-citrulline is one of the non-essential amino acids. This means that the body can synthesize it itself. Citrulline is involved in various metabolic pathways (especially the urea cycle) and is a precursor of the amino acid arginine. Citrulline helps to increase nitric oxide production and neutralize unwanted ammonia. L-tyrosine is a non-essential amino acid that is found in many proteins.