Benefits of Activated Charcoal - Take Home Test
- Dr. Matthew Marcotte
- Jan 9, 2015
- 2 min read
Updated: Mar 14

Let's discuss the benefits of Activated charcoal, and we are not talking about cooking those summer steaks. Activated charcoal is a fine, porous carbon powder that supposedly binds to toxins in the gut and helps flush them out of your system. In fact, ER rooms have used activated charcoal for years in overdose and other toxicity cases.
There are reasons to be cautious about using activated charcoal on a regular basis. In addition to possibly binding to toxins, it might also bind to beneficial substances like medications and certain nutrients, preventing them from being absorbed by the body. There could also be a risk of constipation with overuse.
In my FM practice we use it for another reason. There's a home test you can do with activated charcoal! It's called the Bowel transit test. After you take the charcoal you can see how long your digestive tract transit time is, by observing the color of the stool. Once you see a blackened stool, we can chart the time it took to digest. Optimally it should take between 18-24 hours for food to completely move through the digestive tract.
A shorter time is associated with diarrhea, bowel irritation, malabsorption and increased peristalsis. A longer transit time is often associated with constipation and may increase the likelihood of bowel toxemia, gut dysbiosis, and poor bowel tone. Dysbiosis refers to an imbalance of beneficial and harmful bacteria in the digestive tract and is commonly linked to symptoms such as bloating, food sensitivities, fatigue, and brain fog. Identifying these underlying imbalances is an important step in functional medicine care because restoring the microbiome can significantly improve digestive and overall health. A longer transit time can also be an indication of low fiber and/or water in the diet and other digestive problems. Just another inexpensive test that can be proven effective in finding solutions to healthcare problems.
In functional medicine, evaluating digestive health often involves more than just symptom management. Advanced testing may be used to assess gut bacteria balance, digestive enzymes, inflammation, and intestinal permeability. These insights allow practitioners to uncover the root cause of digestive dysfunction and develop personalized treatment strategies rather than simply masking symptoms. Understanding digestive transit time can provide valuable insight into how well the gut is functioning. While simple home tests like the activated charcoal transit test can offer helpful clues, a comprehensive evaluation is often needed to fully understand digestive health. If you are experiencing symptoms such as bloating, constipation, irregular digestion, or food sensitivities, working with an experienced practitioner can help uncover the root cause.
Learn more about our personalized approach to gut health and chronic digestive issues at our Functional Medicine clinic in Columbus, where we focus on identifying and correcting the underlying causes of digestive dysfunction. Call our office at 614-839-1044 to set up a functional medicine appointment with me to further evaluate potential root cause digestive issues.




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