Polyquaternium-71: 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: July 1, 2025
Share:
Inside this article:

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 Polyquaternium-71?

Polyquaternium-71 is a synthetic polymer belonging to the large family of “polyquats,” ingredients known for their positively charged quaternary ammonium groups. Created in the lab from acrylic or methacrylic monomers that are later quaternized, it results in a water-soluble film-forming molecule that readily binds to the negatively charged surface of hair and skin. The material was introduced to cosmetic chemists in the late 1990s as an upgrade to earlier conditioning polymers, offering improved moisture retention with a lighter feel.

Manufacturing starts with the polymerization of selected monomers into long chains. These chains are then reacted with quaternizing agents that give the final polymer its cationic (positive) charge. After purification and quality checks, the ingredient is delivered as either a clear liquid solution or a dry powder that easily dissolves in water-based formulas.

You will most often spot Polyquaternium-71 in products that need to lock in hydration yet remain weightless such as hydrating serums, sheet masks, lightweight moisturizers, leave-in hair conditioners, curl definers, styling creams and even some anti-aging lotions aimed at smoothing fine lines through surface hydration.

Polyquaternium-71’s Cosmetic Benefits/Uses

In beauty formulas Polyquaternium-71 functions as a humectant, meaning it attracts and holds onto water molecules from the surrounding environment as well as from deeper layers of the skin or hair shaft. By doing so, it helps maintain a plump smooth appearance, reduces transepidermal water loss, improves product spreadability and leaves a soft non-sticky finish.

Who Can Use Polyquaternium-71

Because it is a lightweight water-soluble humectant, Polyquaternium-71 suits nearly every skin type including dry, oily, combination and sensitive skin. It draws moisture without leaving a greasy film so even acne-prone users often find it comfortable. Those with highly reactive or allergy-prone skin should scan ingredient lists for possible irritants that may be paired with the polymer, but the polymer itself is rarely the culprit.

The ingredient is made entirely in the lab from petrochemical or plant-based feedstocks and involves no animal-derived substances, making it suitable for vegans and vegetarians. Most suppliers also certify it as cruelty-free since no animal testing is required for its manufacture.

Current safety data show no systemic absorption through intact skin, so products containing Polyquaternium-71 are generally considered safe for people who are pregnant or breastfeeding. This is not medical advice; anyone expecting or nursing should still review new skincare with a qualified healthcare professional.

Polyquaternium-71 does not increase photosensitivity, so it will not make skin more prone to sunburn. Standard daily sun protection is still recommended for overall skin health. There are no known issues with common actives such as vitamin C, niacinamide or retinol, and it plays well with both sulfate-free and traditional cleansing agents.

Potential Side Effects/Adverse Reactions

Responses to topical Polyquaternium-71 differ among individuals. The effects listed below are possible yet uncommon when the ingredient is used at normal cosmetic levels.

  • Mild skin redness or itching mainly in people with pre-existing sensitivities to cationic polymers
  • Contact dermatitis in rare cases of true allergy to the polymer or impurities left from manufacturing
  • Eye irritation if the raw ingredient or a concentrated formula accidentally gets into the eyes
  • Hair buildup leading to dullness or flat roots when very high amounts are layered without proper cleansing

If any of these reactions occur stop using the product and consult a healthcare professional for guidance.

Comedogenic Rating

Rating: 0 / 5. Polyquaternium-71 is water-soluble and rinses away easily so it does not sit in pores or mix with skin oil the way heavier waxes or oils can. It forms only a light hydrating film that lifts off with normal cleansing which keeps the risk of clogged pores extremely low. Because of this it is generally considered suitable for people who are prone to acne or breakouts.

The ingredient can build up on hair if used in very high amounts yet this film is still water-soluble and does not translate to pore blockage on facial skin.

Summary

Polyquaternium-71 is a lab-made humectant that grabs water and locks it to the surface of skin or hair. Its positive charge helps it stick where needed while its lightweight water-soluble nature keeps the finish smooth and non-greasy. These traits make it useful in hydrating serums, sheet masks and leave-in hair products when a light feel is a must.

Within the formulating world it is fairly popular because it offers dependable hydration without the weight of older conditioning polymers yet most shoppers will not recognize the name on an ingredient label.

Current research and real-world use show a strong safety profile with very low risk of irritation or pore clogging. As with any new skincare or haircare product it is still wise to run a quick patch test to be sure it agrees with your individual skin.

Was this article helpful?
More from Glooshi:
ADVERTISEMENT
Get all our top headlines in beauty.
Delivered right to your inbox each week. Zero spam, all goodness, opt-out at anytime.
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Get the latest beauty news, top product recommendations & brand-exclusive discount codes direct to your inbox.
Send good feedback:

All feedback is greatly appreciated, anonymous, and will be used to improve the quality of our articles.

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Send bad feedback:

All feedback is greatly appreciated, anonymous, and will be used to improve the quality of our articles.

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Search