"my acne cleared up over a couple months, but after i finished the course, my digestive system was destroyed. for four years i struggled to figure out what was wrong with me, i was plagued by brain fog, poor memory, and low energy levels after eating certain foods. turns out, the doxycycline decreased my gut motility, killed off a large percentage of my good bacteria, and ultimately i developed something called sibo (small intestine bacterial overgrowth). i&#039;m currently being treated for sibo, but i will likely never be able to properly digest gluten or dairy again and i&#039;m only 20 years old. trust me when i say that taking this for acne is not worth it under any circumstance. diet is a much better option."