| Cetyl Alcohol | Emulsifier/Thickener | ⚠️ Yes — Cetyl Alcohol | A fatty alcohol used in topical formulations. Can cause contact dermatitis. |
| .alpha.-tocopherol Acetate | Antioxidant | No | Vitamin E acetate. Used as an antioxidant to protect active ingredients from degradation during storage. |
| Allantoin | Skin Protectant | No | A compound that promotes wound healing and cell regeneration. Used as a skin protectant and soothing agent in topical formulations. |
| Cholesterol? | Emulsifier/Stabilizer | No | A natural lipid used as an emulsifier and stabilizer in liposomal and topical formulations. Typically derived from animal sources (lanolin). |
| Diethylene Glycol Monoethyl Ether | — | No | — |
| Dimethyl Sulfoxide | Penetration Enhancer/Solvent | No | DMSO. A powerful solvent that enhances skin penetration of active ingredients. Also used as a cryoprotectant. |
| Edetate Sodium | Chelating Agent | No | A sodium salt of EDTA used to bind metal ions, preventing degradation of active ingredients and preserving formulation stability. |
| Ethylhexyl Hydroxystearate? | Emollient | No | A synthetic ester used as an emollient and skin-conditioning agent in topical formulations. |
| Glycerin | Humectant/Solvent | No | A sugar alcohol that attracts moisture. Used as a humectant, solvent, and sweetener in many oral and topical medications. Generally well tolerated. |
| Glyceryl Monostearate | Emulsifier | No | An emulsifier that helps oil and water mix in creams and ointments. Derived from glycerin and stearic acid. |
| Glycine Hydrochloride | — | No | — |
| Hamamelis Virginiana Top Water | Skin Conditioner | No | Witch hazel distillate, a plant-derived astringent used in topical formulations to soothe and tone the skin. |
| Hypromellose Acetate Succinate, Unspecified? | Enteric Coating | No | A cellulose derivative that dissolves at higher pH, used as an enteric coating to protect drugs from stomach acid. Plant-derived. |
| Lime Oil, Cold Pressed? | — | No | — |
| Mineral Oil | Emollient/Vehicle | No | A purified petroleum-derived oil used as an emollient and vehicle in topical formulations and as a lubricant in oral laxatives. |
| Phenol? | Preservative/Antiseptic | No | An antimicrobial agent used as a preservative in injectable formulations and as an antiseptic in topical products. |
| Phenoxyethanol | Preservative | No | A synthetic preservative used to prevent microbial growth in topical and some oral formulations. Can cause skin irritation in sensitive individuals. |
| Polysorbate 80 | Emulsifier/Solubilizer | No | A non-ionic surfactant used to dissolve and stabilize ingredients that do not mix well with water. Derived from sorbitol and oleic acid. Rare hypersensitivity reactions reported. |
| Stearic Acid | Lubricant | No | A fatty acid used as a lubricant in tablet manufacturing. |
| Trolamine | Emulsifier/pH Adjuster | No | Triethanolamine. Used as an emulsifier and pH adjuster in topical creams and lotions. |
| Vitamin E Polyethylene Glycol Succinate? | Solubilizer/Emulsifier | No | A water-soluble form of vitamin E (also called TPGS) used to improve the absorption of poorly soluble drugs. Contains a PEG component. |