Testo 360 Ultra Although there is no “hard-and-fast” rule to how long you should take it, a good rule of thumb to abide by is using it for 6-8 weeks, or simply until you run out of the supplement. Observe the results you obtained and then decide whether this supplement is right for you . It has been demonstrated in the scientific literature that Vitamin D and Zinc are key components of increasing testosterone via food consumption. Examples of these foods include tuna, egg yolks, beef, beans, ...