We all know we should wash our hands. Fewer of us know how long, when sanitizer is good enough, and when it isn't. Here's the short, evidence-based version.
Written by Vita Globe Editorial Team | Reviewed against CDC guidance, Cochrane reviews and peer-reviewed research
Is hand sanitizer as good as washing your hands?
Not quite. CDC says washing with soap and water is the best way to get rid of germs in most situations[1]. When you can't get to a sink, a sanitizer with at least 60% alcohol is a solid backup, but it doesn't kill every type of germ and works less well on visibly dirty or greasy hands[1]. For washing, scrub for at least 20 seconds[2].
Caveat: Hand hygiene reduces risk; it doesn't eliminate it. A Cochrane review found a modest reduction in respiratory infections, with low-to-moderate certainty evidence[3].
Sources: CDC hand sanitizer · CDC handwashing · Cochrane physical interventions · Verified 2026-09-28
In this article
Why do clean hands matter for colds and flu?
Cold and flu viruses spread mostly through droplets from coughs, sneezes and talking, but hands are the shortcut from a contaminated surface to your eyes, nose and mouth[4]. You touch a shared railing, then rub your eye. That's the route handwashing interrupts.
CDC notes that handwashing helps prevent the spread of both respiratory and diarrheal infections[2]. A meta-analysis of community studies found that improving hand hygiene reduced both gastrointestinal and respiratory illness[5].
How do you wash your hands properly?
CDC's five steps are simple, and most of us skip the middle one[2]:
- Wet your hands with clean, running water and apply soap.
- Lather the backs of your hands, between your fingers and under your nails.
- Scrub for at least 20 seconds. Humming "Happy Birthday" twice is the classic timer.
- Rinse well under clean, running water.
- Dry with a clean towel or air dryer.
Key moments during cold season: before eating or preparing food, after using the toilet, after blowing your nose, coughing or sneezing, and when you get home from somewhere busy[2].
When is hand sanitizer good enough, and when isn't it?
| Soap and water | Alcohol sanitizer (60%+) | |
|---|---|---|
| Best for | Most situations; visibly dirty or greasy hands; before food | On the go when there's no sink |
| Limits | Needs a sink and 20 seconds | Doesn't kill all germs; less effective on dirty or greasy hands |
| How to use | Scrub at least 20 seconds, rinse, dry | Cover all surfaces and rub until dry, about 20 seconds; don't wipe it off |
That's all from CDC guidance[1][2]. Two details people miss: check the label for at least 60% alcohol, and let sanitizer dry on your hands rather than wiping it off halfway. Soap and water also works better than sanitizer against certain germs, such as norovirus, which is worth remembering during stomach-bug season[1].
How much does hand hygiene actually reduce colds?
Honestly, the effect is real but modest. The 2023 Cochrane review of physical interventions pooled hand hygiene trials and found about a 14% relative reduction in acute respiratory infections, which works out to roughly 327 cases per 1,000 people instead of 380[3]. The reviewers rated the certainty low to moderate, and the benefit was less clear for lab-confirmed flu specifically.
That's why hand hygiene works best as one layer in a routine that also includes vaccines, fresh air, sleep and staying home when you're sick. If you work in a shared space, How to Avoid Getting Sick at Work puts it all together. At home, see How to Keep a Cold From Spreading Through Your Household.
The honest summary
- Soap and water, scrubbed for 20 seconds, is the gold standard.
- Use 60%+ alcohol sanitizer when you can't get to a sink, and let it dry.
- Sanitizer is less effective on dirty or greasy hands and against some germs.
- Hand hygiene modestly lowers respiratory infections; pair it with other habits.
What about dry, cracked hands from all that washing?
Frequent washing in cold, dry weather can leave hands chapped, which makes people wash less. Keep a fragrance-free hand cream at your sink and desk and use it after washing, and pat hands dry instead of rubbing. If your skin cracks or bleeds, talk to a healthcare provider or dermatologist, since broken skin is more uncomfortable and harder to keep clean.
Our option
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Frequently asked questions
How long should you wash your hands?
Scrub with soap for at least 20 seconds, then rinse and dry[2].
What percentage of alcohol should hand sanitizer have?
At least 60% alcohol, according to CDC. Check the label[1].
Does hand sanitizer kill cold viruses?
Alcohol-based sanitizers work against many germs, but CDC notes they don't eliminate all types and are less effective on dirty or greasy hands[1]. Washing is still the first choice when you can.
Is antibacterial soap better than regular soap?
For everyday handwashing, plain soap and water used properly is what CDC recommends[2]. Colds and flu are caused by viruses, so an antibacterial label doesn't add much for cold season.
Does washing your hands really prevent colds?
It helps modestly. A Cochrane review found hand hygiene reduced acute respiratory infections by about 14% in relative terms[3]. MedlinePlus lists frequent handwashing, especially after wiping your nose and before eating, among the main ways to prevent colds[6].
Sources
- Centers for Disease Control and Prevention. Hand Sanitizer Use Out and About. Clean Hands. cdc.gov/clean-hands
- Centers for Disease Control and Prevention. About Handwashing. Clean Hands. cdc.gov/clean-hands
- Jefferson T, Dooley L, Ferroni E, Al-Ansary LA, van Driel ML, Bawazeer GA, et al. Physical interventions to interrupt or reduce the spread of respiratory viruses. Cochrane Database of Systematic Reviews. 2023:CD006207. doi:10.1002/14651858.CD006207.pub6
- Centers for Disease Control and Prevention. How Flu Spreads. cdc.gov/flu/spread
- Aiello AE, Coulborn RM, Perez V, Larson EL. Effect of hand hygiene on infectious disease risk in the community setting: a meta-analysis. American Journal of Public Health. 2008;98(8):1372-1381. doi:10.2105/AJPH.2007.124610
- MedlinePlus (U.S. National Library of Medicine). Common cold. medlineplus.gov
About the Vita Globe Editorial Team
The Vita Globe Editorial Team researches and writes our wellness content, working from peer-reviewed research, systematic reviews and guidance from bodies such as the NIH and the FDA. We cite our sources inline and update articles when the evidence changes.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for medical advice. Talk to your healthcare provider before starting any new supplement, particularly if you are pregnant, nursing, taking medication, or caring for a child.
