Sodium Stearoyl Glutamate: 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 30, 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 Sodium Stearoyl Glutamate?

Sodium stearoyl glutamate is a plant based ingredient created by joining stearic acid, a fatty acid usually taken from vegetable oils such as coconut or palm, with glutamic acid, an amino acid that can be sourced from sugar beets or corn. The result is a mild surfactant that carries a sodium salt form, giving it the ability to mix well with water.

The first versions appeared in Japan in the late 20th century when formulators were looking for gentle cleansers that could replace harsher sulfates. Its popularity grew once brands noticed that it doubled as a skin softener and helped oil and water stay blended in creams. Today manufacturers make it through a simple two step process: they react stearic acid with glutamic acid to form stearoyl glutamic acid, then neutralize it with a small amount of sodium hydroxide to create the final salt.

You will spot sodium stearoyl glutamate in a wide range of products including facial cleansers, sulfate free shampoos, sheet masks, rich moisturizers, anti aging serums, lightweight lotions and even color cosmetics where it helps pigments disperse evenly.

Sodium Stearoyl Glutamate’s Cosmetic Benefits/Uses

This multitasker earns its spot in formulas because it can take on several helpful roles at once.

  • Cleansing: Lifts away dirt excess oil and makeup without stripping the skin’s natural barrier so products feel gentle yet effective
  • Hair Conditioning: Leaves a light film on the hair shaft that smooths cuticles boosts softness and reduces static for easier combing
  • Skin Conditioning: Adds a silky touch to creams and serums helping skin feel soft and comfortable after rinsing or throughout wear
  • Emulsifying: Keeps oil and water phases blended so lotions remain stable with a pleasing texture and no separation over time

Who Can Use Sodium Stearoyl Glutamate

Because it is a mild surfactant with skin conditioning properties, sodium stearoyl glutamate is generally well tolerated by most skin types including dry, normal, combination, oily and even sensitive skin. Those with highly reactive or allergy-prone skin may still want to scan ingredient lists for other potential triggers in the formula, yet the ingredient itself is considered low risk.

The material is typically sourced from plant oils and fermented sugars so it is suitable for vegans and vegetarians. If you follow a strict lifestyle you can double-check with the brand that their stearic acid is plant derived rather than animal based, though this is now uncommon.

No studies have raised concerns for topical use during pregnancy or breastfeeding. That said this is not medical advice and anyone who is pregnant or nursing should run their skincare routine past a qualified healthcare professional to be on the safe side.

Sodium stearoyl glutamate does not make skin more sensitive to sunlight and there are no special timing or SPF considerations tied to its use.

Potential Side Effects/Adverse Reactions

Reactions to sodium stearoyl glutamate vary from person to person. The effects below are possible but unlikely for the average user when the ingredient is formulated correctly in a finished product.

  • Mild stinging or redness in very sensitive skin
  • Rare contact allergy that can appear as itching or small bumps
  • Temporary eye irritation if cleanser or shampoo accidentally gets into the eyes
  • Flat or limp feel on fine hair if a high-level conditioning formula is not fully rinsed out

If you notice any of these effects stop using the product and consult a healthcare professional for guidance.

Comedogenic Rating

Rating: 1/5

Sodium stearoyl glutamate is derived from fatty acids yet it remains largely water dispersible and is used at very low percentages, so it has minimal tendency to sit in pores and form blockages. Available research and real-world reports show little to no link between this ingredient and increased breakouts. Therefore it is generally suitable for acne-prone skin.

Keep in mind that the overall pore-clogging risk of a product depends on the entire formula. Heavy oils, waxes or occlusives paired with this ingredient could change the final outcome.

Summary

Sodium stearoyl glutamate works as a gentle cleanser, skin and hair conditioner and a reliable emulsifier that keeps oil and water mixed for smooth stable textures. It lifts away impurities without stripping, leaves a soft afterfeel and helps creams stay uniform.

The ingredient has gained steady popularity in sulfate-free shampoos, mild facial cleansers and modern moisturizers because it offers multiple benefits in one plant-based material, though it is still less talked about than big-name actives like hyaluronic acid or niacinamide.

Current safety data classifies it as low risk for irritation or sensitization when used in cosmetic concentrations. Even so skin can react unpredictably, so performing a quick patch test with any new product containing sodium stearoyl glutamate is a smart precaution.

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