Methyl Glucose Sesquistearate

Overview

Methyl glucose sesquistearate is a non-ionic emulsifier made from corn-derived sugar (methyl glucose) and stearic acid (a plant or animal-derived fatty acid). The result is a waxy off-white solid that melts into the oil phase and creates stable oil-in-water emulsions.

It is one of the most skin-friendly emulsifiers available — non-ionic, low irritation potential, and compatible with sensitive and reactive skin. It is sometimes used as the standard emulsifier in baby skincare and dermatologist-recommended sensitive skin formulations.

The molecule has a moderately high HLB (around 12), which suits it for light to medium lotions and creams. The finish is notably elegant — light, fast-absorbing, and non-greasy — closer to a high-end commercial cream than a homemade lotion.

Shelf life as a raw material is 2-3 years stored cool and dark.

It is sometimes branded as “Glucate SS” or similar trade names; check the INCI to confirm.

What it does in a formula

The methyl glucose head is hydrophilic and projects into the water phase; the stearate tail anchors in the oil phase. This standard surfactant geometry stabilizes oil droplets in water.

The sugar-derived head group is gentle and biodegradable, which is part of why this emulsifier is favoured for sensitive-skin and clean-beauty formulations.

In a formula it produces a light to medium lotion with a refined, non-tacky finish. It pairs well with co-emulsifiers (cetyl alcohol, glyceryl stearate) for thicker creams.

How to use

Add to the oil phase. Heat both phases to 70-75 C, combine, and emulsify with a stick blender for 1-2 minutes. Hold at 70 C briefly for stability.

Usage rates by product type:

• Sensitive skin face lotions: 2-4%
• Baby balms and lotions: 2-4%
• Light body lotions: 2-4%
• Eye creams: 2-4%
• Cleansing milks (gentle): 2-3%
• Post-procedure creams: 2-4%

Pair with co-emulsifiers at 1-3% for thicker creams.

Best for / Worst for

Best for: sensitive and reactive skin lotions, baby and toddler formulas, dermatologist-positioned skincare, post-procedure recovery creams, formulas marketed on “skin-identical” or “ultra-gentle” claims.

Worst for: thick body butters (use heavier emulsifiers), water-in-oil emulsions, very oil-heavy formulas above 30% oil phase.

Common pitfalls

Phase temperature mismatch. Both phases at 70-75 C when combining.

Under-emulsifying. Use a stick blender or homogenizer; gentle stirring is not enough.

Too low percentage for the oil load. Use the 5% rule: for every 1% emulsifier, you can stably emulsify roughly 5-7% oil phase. For 20% oil phase, use about 3-4% emulsifier minimum.

Substitutes

• Glyceryl stearate citrate — natural positioning, slightly different finish.
• Olivem 1000 — natural, slightly different positioning.
• Polysorbate 60 — synthetic, much cheaper, less natural appeal.
• Sucrose stearate — close cousin sugar-ester emulsifier.