Testx Core know and if you have any other suggestion do write going back to me via the comments section below. Can there be Part Results – Brief or Long Term No Testx Core is 100 safe to be used and there are no short or durable side effects. But you are not expected to use it if you are under 18 a woman or someone undergoing any therapy. Unlike the caffeine loaded items that assure quick power and all but crash your system down it does not lead to any withdrawal effects.