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Thanks to the COVID-19 pandemic there’s a hand sanitizer shortage… and a ton of DIY hand sanitizer recipes. Will they actually work? (Spoiler: Most of them won’t.)
I’ve made a video breaking down some of the good bad DIY hand sanitizer recipes out there.
COVID-19 is caused by SARS-CoV-2 (novel coronavirus 2019). One of the ways this virus spreads is by getting on your hands, which then touch your eyes, nose and mouth, then the virus can take hold and multiply in your respiratory tract. To prevent this from happening, health authorities have been promoting hand washing for at least 20 seconds with soap and water, and hand sanitisers when you can’t wash your hands.
(Even if you personally aren’t in a high risk group, it’s a good idea to limit transmission to try to flatten the curve, so hospitals won’t get overwhelmed, and reduce the risk of passing it onto someone vulnerable. Plus it’s often not a very pleasant disease to have, even if you don’t get hospitalised.)
The WHO has these recommended hand sanitiser recipes, which are the ones I would use. These consist of high alcohol content, glycerin (to soften hands) and hydrogen peroxide (to kill bacterial spores on equipment – this doesn’t act to kill germs on your hands).
- Hand sanitisers need to contain 60-95% alcohol to reliably inactivate the coronavirus.
- Currently (as of 14 March 2020) other substances aren’t recommended in hand sanitisers (benzalkonium chloride and other cationic detergents are more effective against bacteria than viruses, and there isn’t any data on how well these work against this coronavirus).
- Essential oils aren’t known to work.
To get over 60% alcohol in the final product, you need to have at least 60% of your recipe as alcohol (if you’re using pure alcohol – you’ll need more if it’s less than 100% alcohol).
You’ll also need to be using an alcohol-containing product with at least 60% alcohol content. Witch hazel (15-30% alcohol) and regular drinking alcohol (<40% alcohol) won’t work (unless it’s nasty high alcohol content drinking alcohol – at least 120-proof).
The DIY recipes I’ve found have alcohol contents ranging from 0% to 70% (a lot of them give “options” that can drop the alcohol content below an acceptable level.)
I’ve also made an Alcohol Content Calculator for working out the final alcohol concentration for a recipe. Link is here – it should be pretty self-explanatory.
Some of the recipes I’ve come across show a disturbing lack of comprehension of how hand sanitizers and destroying viruses work. Statements like “this has worked for me for years”, “the CDC says to use 60% alcohol” (proceeds to add a million things to the 60% alcohol), “[random ingredient] is a good substitute if you don’t have alcohol” were frighteningly common. For some reason, these people who couldn’t handle calculating a percentage or spelling “coronavirus” still felt that they were somehow qualified to make up their own pandemic-halting hand sanitizer recipes.
Anyway, my brain is melting from some of the stupid out there. Stay safe, everyone!
Related post: How Bad Is Alcohol in Skincare, Really? The Science