Since the preparation consists exclusively of natural active ingredients, no side effects should occur when taking it. However, this fact is proven differently if one looks at the some user experiences with Endurancer 24 on the net. It seems that side effects occur which are not only due to allergic reactions of the users or the interactions of the active substances with other substances. The most common side effects include severe headaches, a stuffy nose, redness in the face and nausea. These side effects are probably due to the fact that some men are hypersensitive to the herbs contained in the product. However, the side effects are limited to complaints of an unpleasant nature for the body.