Kind of an "everything but the kitchen sink" approach, but in reality nothing to double your testosterone unless maybe you're on the verge of dying from a deficiency of one of the vitamins.
Magnesium, zinc, B6, B12, D3, DIM, NAC, ashwagandha, withania somnifera, maca root, stinging nettle root, L-citrulline, boron, caffeine, black pepper extract.