First let's get started by answering the question on all our minds, what is microcrystalline cellulose? Microcrystalline Cellulose is processed wood pulp that is used to add texture, fat and prevent caking in products like cosmetics, food, and vitamins. These products are being absorbed and ingested daily by applying make-up and even taking daily medications. Although it is considered safe and there are no limits to its use, too much microcrystalline cellulose can have many unwanted side effects because the stomach and blood system cannot absorb it correctly.  Microcrystalline Cellulose Side Effect: Weight Loss Weight loss is a possible side effect of microcrystalline cellulose. How does it cause weight loss? Well, when it is ingested in large amounts, it makes it harder for the body to absorb it. In return makes it harder for your body to absorb the other nutrients you need such as fats, minerals, and vitamins. Another reason for weight loss is the feeling of being full, but as previously stated this is due to higher doses of microcrystalline. If used correctly the chances of these side effects become slim.  Loss of Energy a Side Effect of Microcrystalline Cellulose Another possible side effect is a loss of energy, headaches, and forgetfulness. Feeling sluggish or fatigued is a sign that your body is running low on energy. The reason behind those headaches, the fatigue and forgetfulness may be that your body cannot get the nutrients it needs to keep the brain healthy. Your body needs things like minerals and fatty acids to keep you going and feeling energized. The culprit is most likely to be the increased amount of microcrystalline that cannot be adequately absorbed and the body's inability to absorb the nutrients it needs to stay healthy easily.  Increased Bowl Movements Increased bowel movements are another possible side effect due to increased amounts of microcrystalline cellulose.  The intestines cannot absorb the increased amount so, in turn, this will cause you to make more trips to the bathroom, doesn't sound ideal. Those with sensitive digestive tracts are more likely to experience these symptoms. Abdominal discomfort and bloating, gas and even diarrhea are also side effects associated with the increased absorption of microcrystalline.   So, like most medications, vitamins, and food products everything is good in moderation. Vitamins are good for you unless you take too much, then they can be harmful. Most food is full of nutrients, but that doesn't mean you should overeat. The same can be said with microcrystalline cellulose if you take the recommended dosage your chances of experiencing these side effects may be slim. The tricky part is that you may not always be aware of how much you are absorbing because many products contain this ingredient. The best thing to do, especially if you are experiencing any side effects, is to read through ingredients in many products to monitor your consumption.  Those who have sensitive digestive tracts may experience some reactions to microcrystalline, regardless of the amount they consume. Like any medication and food product, there is always a possibility of an allergic reaction, and you should still be aware of symptoms and when to seek medical attention or advice.