Sorbitan tristearate is an emulsifier made by combining sorbitol (a sugar alcohol) with stearic acid (a common fatty acid). It appears on ingredient labels as E492 and is used primarily in chocolate and other fat-based foods to keep textures smooth and stable. You’ll also find it in cosmetics and personal care products.
How It’s Made
The ingredient starts with two building blocks: sorbitol, derived from corn or other plant sugars, and stearic acid, a saturated fat found in both animal and plant sources. When heated together under controlled conditions, the sorbitol loses water and reacts with three molecules of stearic acid, producing a waxy, oil-soluble compound with the chemical formula C₆₀H₁₁₄O₈.
The stearic acid can come from beef tallow, palm oil, soy oil, or coconut oil. Most manufacturers today use plant-based sources, but some still use animal-derived stearic acid. If you follow a vegan diet and see sorbitan tristearate on a label, the ingredient itself doesn’t tell you which source was used. You’d need to check with the manufacturer directly.
What It Does in Food
Sorbitan tristearate dissolves in oil rather than water, which makes it especially useful in fat-heavy products. Its main job is acting as a crystal modifier: it influences how fats solidify, which controls the texture and appearance of the final product. In chocolate, this role is critical.
When chocolate sits on a shelf for weeks or months, the cocoa butter crystals inside can slowly shift from one form to another. That shift pushes fat to the surface, creating the chalky white coating known as fat bloom. The chocolate is still safe to eat, but it looks unappealing and feels grainy. Sorbitan tristearate slows this process by forming a three-dimensional network that traps the fat in place and speeds up early-stage crystallization of the cocoa butter. This keeps the chocolate glossy and snap-worthy for longer. Typical usage levels in confectionery range from 0.1% to 5% by weight.
When combined with lecithin (another common emulsifier), sorbitan tristearate creates a gel made of tiny platelets that form a continuous network. This combination boosts the thermal resistance of chocolate, meaning it holds up better in warmer conditions. Beyond chocolate, the ingredient shows up in coatings, margarines, and other products where fat stability matters.
Uses in Cosmetics
In skincare and makeup products, sorbitan tristearate serves a similar purpose: blending ingredients that wouldn’t naturally mix. Creams, lotions, and foundations often contain both water and oil components. Sorbitan tristearate helps stabilize these mixtures so they don’t separate in the bottle. It also contributes to the smooth, spreadable texture consumers expect from these products.
Safety and Daily Limits
Sorbitan tristearate has been evaluated repeatedly by major safety bodies and consistently found to be safe at current usage levels. The joint FAO/WHO expert committee on food additives set a group acceptable daily intake of 0 to 25 mg per kilogram of body weight, last reviewed in 2020. That limit covers the entire family of sorbitan esters (including those made with other fatty acids like lauric, oleic, and palmitic acid), not just the stearic acid version.
For a 70 kg (154 lb) adult, that ceiling works out to about 1,750 mg per day. Given that chocolate and similar products contain sorbitan tristearate in fractions of a percent, reaching that threshold through normal eating would be difficult.
Animal studies reinforce the safety picture. Rats fed diets containing 5% sorbitan tristearate (equivalent to 5,000 mg per kilogram of body weight per day) for two years showed no effects on body weight, mortality, or organ health. Acute toxicity testing found the lethal dose in rats exceeded 2 grams per kilogram of body weight, a very high bar that indicates low toxicity. Skin patch tests on rabbits at 40% concentration caused no irritation, and eye irritation tests were also negative.
The Cosmetic Ingredient Review panel, which evaluates ingredient safety for personal care products, concluded that sorbitan tristearate is safe as currently used in cosmetics. No notable adverse effects have been identified in humans at typical exposure levels from food or topical products.
How to Identify It on Labels
You might see sorbitan tristearate listed under several names depending on the product and region. In the EU, it appears as E492. Chemical databases reference it by its CAS number, 26658-19-5. Some product labels use the trade name Span 65. In cosmetics ingredient lists, it’s typically spelled out as “sorbitan tristearate.” If a label simply says “emulsifier (E492),” that’s the same ingredient.