Denatured alcohol on an ingredient list: what Healthline says about alcohol denat.

Reviewed October 17, 2026

The short answer

Denatured alcohol is ethanol with additives that make it unfit to drink. Healthline says small amounts in cosmetics are usually no problem, but it can dry the skin, weaken the skin barrier, and according to some studies cause breakouts, irritation and redness. It also warns that products labelled alcohol-free can still contain it.

What is it?

Healthline defines it as ethanol mixed with toxic additives, so it cannot be consumed, and says it serves as an inexpensive solvent or fuel. A label may show it as SD alcohol or as alcohol denat. Healthline says an unpleasant odor is often created with acetone, denatonium or methyl ethyl ketone, and a dye can be included.

What does it do in skin care?

Healthline says toners and similar products sometimes include it for drying: it evaporates quickly, cancels out oil and gives a smooth, matte finish.

What are the concerns?

• Healthline: in small amounts it is usually fine in cosmetics, unless methanol is mixed in, which it says can seep through skin.
• Healthline: at the levels used in cosmetics it is not toxic, but it can cause excess dryness and upset the skin's natural barrier.
• Healthline: some studies suggest it may also lead to breakouts, irritation and redness.

The "alcohol-free" loophole

Healthline explains that under strict FDA wording, "alcohol" means ethanol only, so once the alcohol has been denatured it is arguably no longer counted as alcohol. A product can therefore claim to be alcohol-free and still list denatured alcohol. Check the ingredient list, not the front label.

Not every alcohol is the same

Healthline notes that fatty alcohols such as stearyl, cetearyl and cetyl alcohol are added as emollients, and says you do not need to avoid all alcohols in skin care. It cites a small 2005 study of 35 people suggesting that emollients mixed into alcohol hand rubs may cut irritation, and suggests picking a product that also has glycerin, water or fatty alcohols if you are worried.

Hand sanitizer

Healthline advises against making your own hand sanitizer, because getting the amounts wrong could be unsafe or leave it too weak, and says experts consider a 20-second handwash the best method, with an FDA-approved sanitizer when washing is not possible.

How to read it on a label

US cosmetic labels generally list ingredients in descending order of amount, but anything at 1% or less can appear in any order after those above 1%. Its position does not tell you the exact concentration. Judge the whole product, how it feels on your skin, and what changes when you add or drop it.

What not to conclude

This page does not say denatured alcohol will or will not dry your skin. It rests on one Healthline article from 2020 and does not give a safe percentage. If a product with it stings, dries or irritates your skin, stop using it and ask a dermatologist.