Swanson Premium Yohimbe Bark - 4:1 Extract Vitamin 75 mg 100 Caps. Traditionally used to promote male sexual energy o Traditional energizing herb o Full Spectrum whole bark formula o Swanson Premium Yohimbe Bark - 4:1 Extract Vitamin 75 mg 100 Caps o Sold by Swanson Vitamins... - Swanson Premium Yohimbe Bark - 4:1 Extract Vitamin 75 mg 100 Caps.