Some people cannot tolerate the amount of alcohol in the commercial sanitizers. I worked with a woman who was made to use some at work even though she had an exemption from her doctor, and it put her in the hospital. HR fired the boss because he had been told by her and HR and he forced her anyway.
I don't have the issue as bad as my co-worker did, but I can only take so much of it myself. I realize this doesn't cover most, but there are times it covers some.