Harmless and very healthy. My only concern is the formaldehyde produced in the so-called self-brewing process. First of all, the concept of formaldehyde is promoted by finished wine merchants. In order to make people afraid to make their own wine, it's not that serious at all. In addition, sober up or open for 20 minutes before drinking, so that the taste will be better, and any gas components that are not so intentional to the human body will evaporate. Therefore, drinking homemade wine every day is good for your health. Of course, don't drink too much, 50ml of red wine every day is appropriate.