Testx Core Nausea or vomiting Trouble Sleeping Upset Stomach Mood Swings Depression While some of these side effects seem drastic they relatively par for the course when it comes to evaluate improving items. A excellent rule of thumb for avoiding or diminishing these negative impacts is to begin with a small dose and come up. This will have the advantage of helping you discover out if you have an allergic reaction- a small reaction is always better than a larger one.