Yamamoto Nutrition Ai-BURN is a food supplement providing L-Tyrosine, plant extracts and caffeine, to be used in the context of low-calorie diets for weight control. Green tea promotes the balance of body weight, and bitter orange supports lipid metabolism.Caffeine is absorbed by the intestine and goes to work on the nervous system, the cardiovascular system and the adipose tissue. In the nervous system, it acts on an area of the hypothalamus that regulates body temperature (promoting thermogenesis) and, by moderately increasing this temperature, especially during exertion, it uses up more fat. It acts on the adrenal gland, both directly and through the action of the central nervous system, freeing catecholamines which, in addition to increasing physical performance, increase the release of fatty acids as fuel. Guarana, an excellent source of caffeine, is a Brazilian plant native to the Amazon region, and in recent years has become known due to its widespread consumption via drinks, extracts and supplements, thanks to its energy properties. From guarana we get the seeds, which are chemically constituted of caffeine, theophylline and theobromine, three natural alkaloids that have a stimulating effect on the central nervous system. Through this stimulation mechanism, guarana, just like caffeine, can improve reactivity and attention, affect mood by reducing tiredness and fatigue, and suppress feelings of hunger, thereby helping with weight loss. Precisely because of its caffeine content, or rather a large quantity of guaranine (analogous to caffeine), it can also promote the release of catecholamines and stimulate metabolism. Therefore, as well as supporting the body as an energising stimulant, it promotes metabolic acceleration that aids fluid drainage and the use of fatty acids.Green tea: thanks to the polyphenols and high quantities of catechins it contains, it acts on the sympathetic nervous system, increasing thermogenesis and lipolysis. It also seems that green tea exerts a kind of inhibition on intestinal lipases, thereby reducing fat digestion and absorption. To be specific, green tea's particular effect is due to the fact that it also contains a certain amount of caffeine which, together with catechins, can exert a thermogenic effect and that of theanine, an amino acid that limits the secretion of cortisol induced by caffeine.Forskolin: acts as a fat burner and accelerates metabolism by stimulating production of a molecule called cyclic AMP (cAMP) that "helps" cellular communication. When an increase or decrease in cAMP is detected, it acts as a signal that causes our body to perform certain actions. One of the things cAMP does is make our cells increase an enzyme called "hormone-sensitive lipase" that works by burning fat. Coleus forskohlii has been studied above all for its effects on thyroid function. According to research, forskolin stimulates adenylate cyclase in thyroid membranes, an enzyme with regulatory function in all cells, including the production of ATP (for energy) and cAMP (which carries adrenaline signals), with the conclusion that forskolin may support an increase in thyroid metabolism.Synephrine: a molecule found mainly in the unripe bitter orange "Citrus aurantium", involved in weight loss and reducing feelings of hunger. Combined in synergy with caffeine, its stimulating and thermogenic effects are enhanced, as it is also able to accelerate metabolism and thereby allow greater fat oxidation. It works by releasing adrenaline with a reduction in appetite, fat reabsorption and an increase in energy expenditure, and in fact can also stimulate basal metabolism and thus increase energy consumption at rest.Theobromine: a methylxanthine, a natural alkaloid present in cacao trees, whose derivatives came to light thanks to its various notable properties. It has a stimulating effect on the central nervous system, and possesses diuretic and vasodilatory properties. Theobromine is used as a vasodilator and hypotensor, as a diuretic and a cardiotonic, which fits well with this group of components as this substance is a phosphodiesterase inhibitor, thereby reducing deactivation of cAMP (phosphodiesterase is an enzyme that metabolises cAMP and makes it inactive. This substance works as a second intracellular messenger, responsible for hormone activity - and that of neurotransmitters and various metabolic systems. When cAMP inactivation is inhibited by a compound such as theobromine, the effects of the neurotransmitter or hormone that stimulates cAMP production are more prolonged.) and therefore has a stimulating effect, encouraging the stimulation of catecholamines with consequent effects on the release of fatty acids.The presence of L-Tyrosine, an amino acid that intervenes to create neurotransmitters like adrenaline, noradrenaline and dopamine, promotes the formation of thyroid hormones t3 and t4 and, along with other elements, helps with thermogenesis.