We value transparency and proof of science. Below are a few trials showing endurance results with each of the ingredients that are in flow. These natural ingredients has show performance benefits.
Beetroot Juice Boosts Stamina https://www.sciencedaily.com/releases/2009/08/090806141520.htm
Efficacy of Ashwagandha in improving cardiorespiratory endurance in healthy athletic adults https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4687242/
Athletic Performance Enhancement with Ayurvedic Supplements http://medcraveonline.com/IJCAM/IJCAM-03-00073.pdf
The Effects of an Acute Dose of Rhodiola rosea on Endurance Exercise Performance https://journals.lww.com/nsca-jscr/FullText/2013/03000/The_Effects_of_an_Acute_Dose_of_Rhodiola_rosea_on.37.aspx
Capsaicin Supplementation Reduces Physical Fatigue and Improves Exercise Performance in Mice https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5084035/
TRPV1 activation improves exercise endurance and energy metabolism through PGC-1α upregulation in mice https://pubmed.ncbi.nlm.nih.gov/22184011/