Triethanolamine

Triethanolamine is one of those behind-the-scenes ingredients that rarely gets the spotlight, even though it helps a lot of formulas behave themselves. Its job is mostly to adjust pH and keep products stable, which is very unglamorous but extremely useful. Chemically, it’s an organic amine with the formula C6H15NO3, and its structure gives it the ability to neutralize acids and help emulsions stay nicely blended instead of separating into a sad oily mess.

So what does triethanolamine do to the skin? In a finished cosmetic, usually not much in the “active skincare” sense. You’re more likely to see it in creams, lotions, sunscreens, shaving products, and some makeup, where it helps with texture, thickness, and pH. It can also be part of salts such as triethanolamine salicylate, and in that case it’s helping form a more usable ingredient rather than acting on its own. The main benefits of triethanolamine for skin are really about making the product feel better and work properly, not about being a superstar hydrator or antioxidant. If you’re hunting for triethanolamine uses on a label, think emulsifier, pH adjuster, and formula stabilizer.

As for triethanolamine danger, this is where the internet likes to get dramatic. By itself, it’s generally considered safe in cosmetics at the levels used, but there is a real formulation caveat: if it’s combined with nitrosating agents or contaminated materials that can generate nitrosamines, that’s not something you want. Good manufacturers control for this, and that’s why the triethanolamine SDS and quality specs matter so much to formulators. The CAS number you’ll usually see is 102-71-6. If you’re wondering how to use triethanolamine, the short answer is: you don’t use it as a DIY skin treatment; it belongs in carefully balanced formulas, and the amount needed is tiny. If you’re looking for what can I use instead of triethanolamine, formulators often turn to other pH adjusters or neutralizers such as sodium hydroxide, potassium hydroxide, or aminomethyl propanol, depending on the product and the desired feel. On the price side, triethanolamine is a pretty inexpensive workhorse, which is one reason it shows up so often.

Bottom line: triethanolamine isn’t a flashy “treat your skin” ingredient, but it helps cosmetic formulas stay effective, pleasant, and stable. In the right product, that’s a very good thing.

It’s a little helper ingredient that helps to set the pH of a cosmetic formulation to be just right. It’s very alkaline (you know the opposite of being very acidic): a 1% solution has a pH of around 10.

It does not have the very best safety reputation but in general, you do not have to worry about it. 

What is true is that if a product contains so-called N-nitrogenating agents (e.g.: preservatives like 2-Bromo-2-Nitropropane-1,3-Diol, 5-Bromo-5-Nitro- 1,3-Dioxane or sodium nitrate - so look out for things with nitro, nitra in the name) that together with TEA can form some not nice carcinogenic stuff (that is called nitrosamines). But with proper formulation that does not happen, TEA in itself is not a bad guy. 

But let’s assume a bad combination of ingredients were used and the nitrosamines formed. :( Even in that case you are probably fine because as far as we know it cannot penetrate the skin. 

But to be on the safe side, if you see Triethanolamine in an INCI and also something with nitra, nitro in the name of it just skip the product, that cannot hurt.