Ammonium Acryloyldimethyltaurate/Beheneth-25 Methacrylate Crosspolymer: What Is It, Cosmetic Uses, Benefits & Side Effects

Curious about this ingredient? In this article we're explaining exactly what it is and why it's used within cosmetic formulations.
Updated on: June 23, 2025
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We verify all information on this page using publicly available nomenclature standards from The Personal Care Products Council (PCPC), the European Commission's CosIng database and documentation provided directly by ingredient manufacturers. Our analysis is based on technical data from these sources to ensure accuracy and reliability.

What Is Ammonium Acryloyldimethyltaurate/Beheneth-25 Methacrylate Crosspolymer?

Ammonium Acryloyldimethyltaurate/Beheneth-25 Methacrylate Crosspolymer is a synthetic polymer created by reacting acryloyldimethyltaurate units with beheneth-25 methacrylate segments and neutralizing them with ammonium ions. The building blocks are derived from petrochemical feedstocks and fatty alcohols sourced from natural plant oils such as rapeseed or coconut. First introduced in the early 2000s as chemists searched for more elegant thickening systems, it quickly gained popularity for its ability to keep water-based and oil-based ingredients blended in stable, smooth textures.

The manufacturing process involves free-radical polymerization carried out in controlled reactors, followed by purification and drying to produce a fine white powder. Because the polymer forms a three-dimensional network when dispersed in water, formulators can achieve a silky, gel-like consistency without heavy waxes or gums.

You will typically find this ingredient in moisturizers, lightweight lotions, hydrating masks, facial serums, sunscreens, hair conditioners and styling creams where a non-greasy feel and long-lasting stability are essential.

Ammonium Acryloyldimethyltaurate/Beheneth-25 Methacrylate Crosspolymer’s Cosmetic Benefits/Uses

In cosmetics this polymer serves one main purpose that greatly improves how a product looks feels and performs.

As an emulsion stabilising agent it keeps oil and water phases from separating so creams stay uniform, textures remain smooth and active ingredients are evenly distributed from the first application to the last. This stability helps extend shelf life prevents unsightly separation rings and ensures that the formula delivers consistent moisture and performance every time it is applied.

Who Can Use Ammonium Acryloyldimethyltaurate/Beheneth-25 Methacrylate Crosspolymer

This polymer is gentle, lightweight and non occlusive so it suits most skin types including oily, combination, dry and even sensitive skin. Because it does not add grease or heavy film it works well for acne-prone complexions too. There are no known concerns for any particular skin type though people with extremely reactive skin should always watch for personal triggers in any new product.

The ingredient is manufactured from petrochemical sources blended with plant-derived fatty alcohols and contains no animal-derived substances. That makes it acceptable for vegetarians and vegans as long as the finished product formula and processing are also free from animal inputs.

Current safety data show no reproductive or developmental risks so products containing this polymer are generally considered safe for women who are pregnant or breastfeeding. This is not medical advice and anyone who is expecting or nursing should ask a doctor before adding new skincare to their routine just to be safe.

The polymer does not absorb UV light or make skin more vulnerable to the sun so it is not linked to photosensitivity. It is also fragrance free and inert which further reduces the chance of irritation for fragrance-sensitive users.

Potential Side Effects/Adverse Reactions

Side effects from topical use of Ammonium Acryloyldimethyltaurate/Beheneth-25 Methacrylate Crosspolymer can vary from person to person. The points below list potential reactions but they are uncommon when the ingredient is used at normal levels in well-formulated products.

Temporary redness or mild stinging on very sensitive skin

Rare cases of allergic contact dermatitis in individuals already allergic to acrylate materials

Minor clogged pores if a formula containing the polymer also has heavy oils and is not removed properly

Dry or tight feeling if used in high concentrations without complementary emollients

If you notice any of these effects stop using the product and seek advice from a healthcare professional or dermatologist.

Comedogenic Rating

Rating: 0 / 5

This polymer has a very large molecular size and sits on the surface without penetrating pores or forming a heavy, greasy film. It is primarily a water-dispersible texture enhancer with no intrinsic oil content, so it does not feed acne-causing bacteria or block follicles. For these reasons it scores a solid zero on the comedogenic scale.

That makes it a safe pick for people who are prone to acne or breakouts, provided the rest of the formula is also lightweight and non-comedogenic.

The only caveat is that a product can still cause congestion if it contains rich oils or butters alongside this polymer. Always look at the full ingredient list when judging a product’s pore-clogging potential.

Summary

Ammonium Acryloyldimethyltaurate/Beheneth-25 Methacrylate Crosspolymer is used to keep oil and water blended, thicken formulas and create a silky gel feel. It does this by forming a three-dimensional network in the water phase that stabilises droplets of oil so the product stays smooth and homogeneous from the first pump to the last.

While not a household name, it has become a quiet workhorse in modern moisturisers, sunscreens and hair products thanks to its elegant, non-sticky texture and reliable performance.

Current safety data show it is non-sensitising, non-comedogenic and generally well tolerated across skin types. As with any new ingredient or formula though, do a quick patch test before full-face use to make sure your skin stays happy.

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