A Southeast Asian root with the most human research data in this formula.
Tongkat Ali (Eurycoma longifolia), also sold as longjack, is a Southeast Asian root and the ingredient in Primordial Vigor X with the most human research behind it.
Studies in stressed adults have reported lower cortisol and improved mood alongside changes in free testosterone, which is the main reason it leads this formula.
Extract quality and eurycomanone content can vary between suppliers, so consistent sourcing matters for an ingredient like this.