Sorbitol

Overview

Sorbitol is a sugar alcohol — a polyol — derived from glucose. It occurs naturally in many fruits (apples, pears, prunes) and is commercially produced by hydrogenation of glucose. The cosmetic grade is supplied as a clear syrup (70% sorbitol solution) or as fine white crystals.

It is a humectant similar in function to glycerin but with a noticeably less tacky feel. Where glycerin can leave a sticky residue at higher percentages, sorbitol feels lighter and more refined. Sweet-tasting (about 60% as sweet as table sugar), odourless, and non-irritating.

Sorbitol is a key ingredient in transparent (melt-and-pour) soap making — the polyol structure interrupts the crystalline soap network and produces the characteristic glass-like clarity. It is also widely used as a humectant in toothpaste, mouthwash, and skincare.

Shelf life is 2-3 years stored cool and sealed.

It is one of those “quietly useful” ingredients that solves specific formulation problems (transparent soap, less-tacky humectant) without grand marketing claims.

What it does in a formula

Sorbitol binds water at the skin surface, providing gentle humectant action. The molecular size and structure give it a softer, less tacky feel than glycerin — a real and noticeable difference at higher percentages.

In transparent soap making, sorbitol disrupts the crystalline soap structure, producing the see-through clarity that defines transparent soap. The amount required (typically 10-20% of the formula) is high compared to its use as a humectant.

It also has mild plasticizing effects in solid products (lip balms, soap), keeping them slightly more flexible.

In a formula sorbitol adds a smooth, refined dry-down feel.

How to use

Add to the water phase. Tolerates heat-and-hold to 90 C without degradation.

Usage rates by product type:

• Face creams (humectant): 2-5%
• Body lotions: 2-8%
• Hand creams: 2-5%
• Transparent soap: 10-20% (as a structural ingredient)
• Toothpaste: 5-30%
• Mouthwash: 5-15%
• Hair conditioners: 1-3%
• Lip balms (softening): 2-5%

Best for / Worst for

Best for: transparent soap, formulas where glycerin’s tackiness is a problem, sensitive skin humectant choice, oral care products, hand creams with elegant finish, hair conditioners.

Worst for: anyone with a known sorbitol sensitivity (rare), formulas where you want a stronger humectant pull than sorbitol provides (use glycerin or hyaluronic acid).

Common pitfalls

Sweet taste in lip products. Sorbitol is noticeably sweet. In lip balms and oral products this is usually a feature; in face products it can be an issue if customers taste-test the product.

Crystallization at high concentrations. Pure sorbitol can crystallize in concentrated solutions if stored cold. The 70% solution is stable; the dry powder must be properly dissolved before use.

Confusion with maltitol and xylitol. All three are sugar alcohols, but they have slightly different properties. Sorbitol is the cosmetic standard for transparent soap and humectant use.

Substitutes

• Glycerin — more humectant pull, stickier feel.
• Propanediol — lighter, less tacky, similar role.
• Sodium lactate — humectant + soap hardener, different role.
• Mannitol — close sugar alcohol relative, different properties.