Although not common, yes it is possible. Many people out there think that because something is natural it is also free from side effects. Although it would be nice, this assumption is false. Any product you consume with the intention of altering how your body works has potential for side effects. By looking at what the product does when consumed, you can often predict what the most common side effects may be. Very important to keep in mind is that just because a product causes side effects does not mean that it is bad for you.