Alcohol-free hand sanitizers: how they work and what the evidence says

Alcohol-free hand sanitizers promise the convenience of a pump bottle without the sting, the smell or the dryness. They exist, they’re legal in Canada, and they do something. The honest question is how much, compared with alcohol and compared with soap. Here’s what’s in them, how Health Canada handles them, and where the evidence lands.

What “alcohol-free” actually contains

Alcohol-based sanitizers work with ethanol or isopropanol at 60 to 80 percent, which breaks apart the proteins and fatty membranes of germs on contact. Alcohol-free products need a different active ingredient, and in Canada that’s almost always benzalkonium chloride.

Benzalkonium chloride is a quaternary ammonium compound, or “quat”: a positively charged molecule that latches onto the negatively charged surfaces of bacteria and some viruses and disrupts their outer membranes. It’s the same family of ingredients used in many surface disinfectants and some eye drops as a preservative. In hand sanitizers it’s used at very low concentrations, a fraction of one percent, and it leaves a thin residue on the skin rather than evaporating like alcohol.

A few other actives are allowed in Canada for the same purpose: benzethonium chloride (a close cousin), chlorhexidine gluconate (familiar from surgical scrubs) and chloroxylenol. In practice, most alcohol-free products on Canadian shelves are benzalkonium chloride.

How Health Canada authorizes hand sanitizers

In Canada, a hand sanitizer is not a cosmetic. It’s a health product that has to be authorized before it can be sold, and the label tells you which route it took.

• Alcohol-based sanitizers are natural health products. They’re licensed under Health Canada’s monograph for antiseptic skin cleansers, which sets ethanol at 60 to 80 percent or isopropanol at 60 to 75 percent, and they carry an eight-digit Natural Product Number, or NPN.
• Alcohol-free sanitizers are non-prescription drugs. Under the same monograph, benzalkonium chloride is allowed at 0.1 to 0.15 percent, benzethonium chloride at 0.05 to 0.5 percent, chlorhexidine gluconate at 2 to 4 percent and chloroxylenol at 0.5 to 3 percent. These products carry a Drug Identification Number, or DIN.

Health Canada publishes a searchable list of authorized hand sanitizers. If a product has no NPN or DIN on the label, it hasn’t been authorized in Canada. During the pandemic the department made this list a central tool for spotting unauthorized imports.

The monograph also limits what any of these products can claim. A sanitizer can say it’s an antiseptic or antibacterial cleanser that kills harmful bacteria or germs. It can’t claim to kill 99.9 percent of germs (the monograph explicitly doesn’t support that kind of “log reduction” claim), can’t claim antiviral effects, and Health Canada notes that no hand sanitizer in Canada is authorized with claims about COVID-19. That applies to alcohol and alcohol-free products alike. A product must also contain only one active ingredient to qualify under the monograph.

What the evidence says compared with alcohol

This is where alcohol-free products come up short, and the regulators say so.

The US Centers for Disease Control and Prevention, in its hand hygiene guidance for health care providers, notes that benzalkonium chloride is eligible for use in hand rubs, then adds that available evidence indicates it has less reliable activity against certain bacteria and viruses than either of the alcohols. The CDC’s recommendation for health care settings remains a hand rub with more than 60 percent ethanol or 70 percent isopropanol, and it says it has no recommended alternative to those.

The CDC’s consumer guidance follows the same line: use a sanitizer with at least 60 percent alcohol, and it doesn’t discuss alcohol-free products at all.

Why the gap? Alcohol kills quickly and broadly, including many viruses without a fatty envelope that quats handle poorly. Benzalkonium chloride works more slowly and its results vary more between germs and between studies. That doesn’t make it useless; it’s still an antiseptic, and Health Canada accepts it for everyday use. It means that when reliability matters, such as caring for someone who’s sick, alcohol is the better-supported choice.

Where alcohol-free products have a case

There are reasons people reach for them, and some are legitimate:

• Skin tolerance. Alcohol can sting on cracked skin. Interestingly, the CDC’s guidance for health workers says alcohol-based hand rub is actually less irritating and drying than soap and water, so alcohol-free isn’t automatically gentler than washing. But for people with very sore hands, a benzalkonium chloride product may feel more tolerable.
• Settings where alcohol is unwelcome. Some workplaces, schools or facilities restrict flammable products or alcohol for other reasons.
• Residual feel. Quats leave a film on the skin. Some products build “long-lasting” claims on this, which we cover in a separate article. Health Canada’s monograph doesn’t list persistence among the claims it allows, so such a claim needs its own evidence.

None of those turns an alcohol-free product into an alcohol-equivalent one. They’re reasons to accept a trade-off knowingly.

When washing your hands is better than any sanitizer

Both the CDC and Health Canada put sanitizers in second place behind soap and water, and it’s worth taking that literally. Health Canada’s monograph says personal hand antiseptics should be used sparingly on lightly soiled hands as a second-line approach, and are not a substitute for plain soap and water.

Wash rather than sanitize when:

• your hands are visibly dirty or greasy, because sanitizers of any kind work poorly through grime;
• you’ve used the toilet or changed a diaper;
• you’ve been gardening, camping or handling raw food;
• the germ you’re worried about is one sanitizers handle poorly. The CDC names norovirus, Cryptosporidium and Clostridioides difficile, and notes that soap and water also remove chemicals that sanitizers don’t.

When you do use a sanitizer, alcohol or not, use enough to wet all surfaces of both hands and rub until dry. The CDC says that takes about 20 seconds, and warns not to wipe or rinse it off early, because it may not work. Health Canada’s directions for alcohol products are similar: at least 30 seconds of rubbing, until dry.

Reading the label at the store

A quick checklist for any sanitizer:

• A number. NPN for alcohol, DIN for alcohol-free. No number, no authorization.
• The active and its strength. Ethanol or isopropanol at 60 percent or more; benzalkonium chloride at 0.1 to 0.15 percent.
• Realistic claims. “Kills harmful bacteria” is allowed. “Kills 99.9 percent of germs” or anything about viruses or COVID-19 is not.
• A warning to keep it away from children. Alcohol products must carry it because swallowing even small amounts can be dangerous.

If your hands are dry, cracked or sore from sanitizing, that’s a skin barrier problem, not a reason to sanitize less when it matters. Moisturize after washing, and if it isn’t better after two weeks, see your doctor or pharmacist. You can browse hand care products that have been reviewed for the claims they make.

The short version: alcohol-free sanitizers are real, authorized products in Canada, built on benzalkonium chloride at a fraction of a percent, and they’re less reliable than alcohol against some germs. Use them with that in mind, keep alcohol on hand for when it counts, and remember that neither one beats a sink.