Why do you need healthy levels of Testosterone? Well maybe to start with the most apparent reason; it's good for male fertility. That in itself has a number of indirect effects that tie into longevity.
But also a number of other great health benefits;
Improved mood and general wellbeing. Better brain and memory function. Leaner body composition, less fat retention. Healthy heart and blood. Good bone mineral density..stronger bones
Have a look at www.swissnaturalfoods.com there you will find research that supports optimal levels of testosterone related to Zinc, Magnesium, Vitamin D, Ashwagandha and Tongkat Ali.
All these ingredients can be found in the T-BAR.
Maybe you should try T-BAR ones.