Not many current users or BETA testers reported side effects. Many listed all the benefits of Yok3d, with no side effects. But those who experienced negative effects, the most common side effects were:
With that said, it was a very low percentage. I personally have already completed a bottle of Yok3d, and I have experienced no negative side effects.
If you have experience any negative Yok3d side effects, please list them in the comments below.