What it is
Ceratonia Siliqua (Carob) Gum is a white to yellowish powder obtained from the ground endosperm of seeds of the carob tree (Ceratonia siliqua). Its primary components are galactomannans — high-molecular-weight polysaccharides with a mannose-to-galactose ratio of approximately 4:1. In cosmetic formulations it functions as a texture enhancer, thickening agent, emulsion stabilizer, and binder, improving spreadability and the overall sensory profile of creams, gels, and serums. It creates a lightweight film on the skin surface that supports a smooth feel without occlusion. As a plant-derived alternative to synthetic rheology modifiers, it is favored in clean-beauty and natural formulations. It is non-comedogenic and generally well tolerated by sensitive skin.
Safety & warnings
Locust bean gum is considered safe for cosmetic use at typical concentrations. The CIR Expert Panel reviewed galactomannans and found no significant safety concerns for leave-on or rinse-off formulations. The EFSA concluded no safety concern at food-grade use levels. Rare hypersensitivity reactions have been documented — thought to be related to residual seed proteins rather than the gum polysaccharide itself — primarily in infants or individuals with legume (Fabaceae) sensitization. Patch-test data indicate low irritation and sensitization potential in adults. Non-comedogenic; does not promote acne breakouts.
Origin & sourcing
Extracted from seeds of the carob tree (Ceratonia siliqua), native to the Mediterranean basin. After carob pods are processed, the seeds are separated and their outer coat removed by acid or heat (roasting) treatment. The deskinned seeds are then split and milled to isolate the pale endosperm, which is roller-milled into a fine powder. A clarified form is produced by dissolving the gum in hot water and precipitating with ethanol or isopropanol. Major producing countries include Portugal, Spain, Italy, and Morocco, which together supply about 75% of global output.
History
The carob tree has been cultivated in the Mediterranean region for approximately 4,000 years, with ancient Egyptians exploiting the adhesive properties of the seeds. Carob seeds served as a jeweler's weight standard in antiquity — their remarkably uniform mass of ~200 mg gave rise to the word 'carat'. Locust bean gum came into wider commercial use as a food hydrocolloid in the 20th century and was assigned the European food-additive code E410. The EU CosIng database registers Ceratonia Siliqua Gum for cosmetic use with functions including binding, emollient, emulsion stabilising, and film forming.
Questions everyone asks
What does Ceratonia Siliqua (Carob) Gum do in a skincare product?
It acts mainly as a thickener and emulsion stabilizer, giving creams and serums a smooth, spreadable texture. It also forms a thin film on the skin surface that helps condition and soften skin.
Is carob gum safe for sensitive skin?
Yes, for most people. It is plant-derived, non-comedogenic, and has a low irritation profile. Those with known legume (Fabaceae family) allergies should exercise caution, as trace seed proteins could potentially trigger a reaction.
Is Ceratonia Siliqua (Carob) Gum natural or synthetic?
It is entirely natural. The gum is mechanically and physically extracted from carob seeds without chemical synthesis, making it a popular choice in natural and clean-beauty formulations.
What is the difference between carob gum and locust bean gum?
They are the same substance. 'Locust bean gum' and 'carob gum' are two common names for the galactomannan extracted from Ceratonia siliqua seeds; the INCI name includes both to avoid confusion.