Why Hand Sanitizer Works: Alcohol and Germs

Alcohol kills germs by breaking apart their proteins and dissolving protective membranes.
Ethanol and isopropanol are the main alcohols used in sanitizers for broad antimicrobial action.
60–70% alcohol content is the sweet spot—too little is weak, too much evaporates too quickly.
Viruses with envelopes, like flu and coronaviruses, are especially vulnerable to alcohol’s solvent power.
Non-enveloped viruses (like norovirus) are tougher, which is why soap and water work better on them.
Gels and thickeners like glycerin make sanitizer easy to spread and less harsh on skin.
Contact time matters—rubbing sanitizer for at least 20 seconds ensures maximum germ kill.
Sanitizers don’t remove dirt, which can shield germs, so washing with soap is sometimes essential.
Overuse myths aside, alcohol sanitizers don’t cause resistance because they destroy germs chemically.
Safe handling counts—sanitizers are flammable and should be stored carefully away from heat.