Natural Test Complex, is a proprietary manufacturer complex of substances and herbal extracts affecting the increase in testosterone levels and increase of anabolism. Components - without specifying their percentage and standardization of active ingredients – of complex are: extract of Tribulus natural (plant used in folk medicine of the Far East, as a strong aphrodisiac and tonic, which active ingredient is saponin steroid [PTN], causing the release of nitric oxide in corpora cavernosa of the male sex organ, and increase the testosterone level), an extract of Eurycoma longfolia (source of alkaloids and glycosides, aphrodisiac which improves sexual function [increases free testosterone levels while reducing estrogenic activity], increases the immunity and psychophysical strength of organism) and extract of oat (the a source of biologically active compounds. the use of accelerating muscle building and regeneration. High levels of testosterone affect libido). To be effective, the complex must be used during a longer period. Recommended for use for persons with intense psycho-physical stress and those who are overtired, because it increases exercise capacity, calms and improves mood and increases sexual function. Natural Test Complex is available at www.muscle-zone.pl.