hi Biotin does not change body odor. However, getting too much biotin increases risk of developing cystic acne on the chin and jawline. Make sure you take doses of biotin that are less than 2500 mcg or less each day and drink plenty of water while using biotin supplements to reduce your risk of developing cystic acne. Allergic reactions to biotin are not common, but they are still possible. If you are suffering from an allergic reaction to biotin you may feel nausea, develop an itchy rash, tightness or pain in your chest and swelling of the throat and face. If you start to develop these symptoms call your doctor for help immediately as some of these developments can be fatal. If you are taking high doses of biotin while you are trying to get pregnant it can increase your risk of suffering a miscarriage. Biotin negatively interacts with anti-seizure medications and medications that help lower cholesterol, causing these medications to work less effectively. Hope this is helpful. Take care.