Natural stimulated improving blood flow and overall circulation. Green Tea has rich antioxidant properties and polyphenols, particularly epigallocatechin gal late (EGCG), which support glucose tolerance, fat oxidation, and metabolic capacity.[i] Green tea extract was given to subjects who participated in a moderate-intensity exercise program to find glucose sensitivity and fat oxidation were greater in those taking the extract.30 It has also been shown to improve metabolic capacity and muscle health.[i],[ii], [iii] Green tea has been suggested to improve exercise endurance, in which researchers investigated the effects on maximal oxygen uptake (VO2max). EGCG, the main component in green tea, was shown to increase VO2 max to suggest an increase in arterial-venous oxygen.[iv] (  Venables, MC, Hulston, CJ, Cox, HR, Jeukendrup, AE. Green Tea extract ingestion, fat oxidation, and glucose tolerance in healthy humans. Am J Clin Nutr. 2008 Mar;87(3):778-784.
 Dorchies OM, Wagner S, Vuadens O, et al. Green tea extract and its major polyphenol (-)-epigallocatechin gallate improve muscle function in a mouse model for Duchenne muscular dystrophy. Am J Physiol Cell Physiol. 2006 Feb;290(2):C616-25.
 Murase, T, Haramizu, S, et al. Green Tea extract improves endurance capacity and increases muscle lipid oxidation in mice. Am J Physiol Regul Integr Comp Physiol. 2005 Mar;288(3):R708:715.
 Murase, T, Haramizu, S, et al. Green Tea extract improves running endurance in mice by stimulating lipid utilization during exercise. Am J Physiol Regul Integr Comp Physiol. 2006 Jun;290(6):R1550-1556.
vi -Richards JC, Lonac MC, Johnson TK, et al. Epigallocatechin-3-gallate increases maximal oxygen uptake in adult humans. Medci Sports Exerc. 2010 Apr;42(4):739-44.