Extra Strong. Extra Strong Herbal Capsules. This formula is an herbal supplement for men based on theories of traditional Tibetan health & science. It extract potent ingredients from natural herbs in Himalayas Mountains 4000m above sea level. It is made up of unique Qinghai-Tibet plateau native material. Increases stamina & maintains a sustainable erection. Enhances performance. Maximum Strength. Herbal basis with no chemical substance. Pharmaceutical grade. Works in 30 mins. No side effects