19 Best Hand Sanitizers Of 2020, According To Doctors- ingredent of hand senatazer ,"Hand sanitizer is a good way to disinfect when you don't have access to soap and water between hand washes," confirms Dr. Andrew Alexis, MD, chair of Mount Sinai's department of dermatology.These Are the Four Hand Sanitizer Ingredients, According ...Shutterstock. And the fourth ingredient in hand sanitizer is, simply enough, water. But as the U.S. Food and Drug Administration (FDA) notes, the water has to be sterile, which is why WHO's ingredients list mentions "sterile distilled or boiled cold water."As neuroscientist and stem cell biologist Samantha Yammine, PhD, noted on Twitter, "There is some water in hand sanitizer that helps to ...