There are four different strains of MCT oil: caproic acid, capric acid, caprylic acid, and lauric acid. MCT is beneficial for weight loss and fat burning and is increasing in popularity as a health supplement, but it is not without risk. Overuse of MCT can cause acute gastric distress, including vomiting, diarrhea, nausea, gas, etc., and it can also cause irritability and is not considered safe for diabetics to use.