Stacker 3 XPLC is sold over the counter as a weight-loss and energy supplement. I'm not sure they sell them in the UK, but you can get yohimbe from a multitude of sources (enthnobotanicals websites, various over-the-counter supplements) and dihydroxybergamottin is found in large amounts in grapefruits. Yohimbe is dangerous to combine with MAOIs, as not only does it have its on MAOI action, but it is a stimulant! ...mixing any stimulant with heavy digestive MAOI action is highly inadvisable and may lead to heart attack....which is why I suggested that if you are an ayahuasca drinker, simply add some grapefruit or grapefruit juice to your mixture and steer clear of the Stacker 3 XPLC or anything with yohimbe in it.