| Hydrogenated Castor Oil | Stiffening Agent/Emollient | ⚠️ Yes — Castor Oil | Castor oil treated with hydrogen to make it solid at room temperature. Used to thicken creams and ointments. |
| Medium-chain Triglycerides | Solvent/Vehicle | ⚠️ Yes — Coconut | Fatty acid esters derived from coconut or palm kernel oil. Used as a solvent and vehicle in oral and topical formulations. May be relevant for individuals with coconut sensitivity. |
| .alpha.-tocopherol Acetate | Antioxidant | No | Vitamin E acetate. Used as an antioxidant to protect active ingredients from degradation during storage. |
| Acrylic Acid-2-ethylhexyl Acrylate-2-hydroxyethyl Acrylate-vinyl Acetate Copolymer (for Duro-tak 87-2070)? | Adhesive | No | A pressure-sensitive adhesive polymer used in transdermal patches to hold the patch to the skin. |
| Aminomethylpropanol | pH Adjuster | No | An amino alcohol used to neutralize carbomer gels and adjust pH in topical formulations. |
| Ascorbyl Palmitate | Antioxidant | No | A fat-soluble form of vitamin C used as an antioxidant in pharmaceutical formulations to prevent oxidation of fats and oils. |
| Benzyl Benzoate | Solvent/Preservative | No | An organic ester used as a solvent in injectable formulations and as a preservative. Can cause contact irritation. |
| Butylated Hydroxytoluene | Antioxidant | No | BHT. A synthetic antioxidant used to prevent oxidative degradation of fats and oils in pharmaceutical products. Rare contact sensitivity reported. |
| Corn Oil | Solvent/Vehicle | No | Oil extracted from corn germ, used as a solvent and vehicle in oral formulations. Must be avoided by individuals with corn allergy. |
| Cyclomethicone 5 | Emollient/Carrier | No | A volatile silicone that evaporates quickly, leaving a smooth feel. Used as a carrier and emollient in topical products. |
| Dimethicone 20 | Skin Protectant | No | A silicone-based polymer used as a skin protectant, emollient, and anti-foaming agent in topical formulations. |
| Dimethylaminoethyl Methacrylate - Butyl Methacrylate - Methyl Methacrylate Copolymer? | Coating Agent | No | A methacrylic polymer (Eudragit E) that dissolves in acidic conditions. Used for taste-masking and moisture-protective coatings. |
| Edetate Sodium | Chelating Agent | No | A sodium salt of EDTA used to bind metal ions, preventing degradation of active ingredients and preserving formulation stability. |
| Ferric Oxide Red | Colorant | No | Red iron oxide pigment used in tablet coatings and capsule shells. A mineral-based colorant, distinct from FD&C synthetic dyes. |
| Glyceryl Isostearate | Emulsifier | No | A glycerin ester used as an emulsifier and skin-conditioning agent in topical formulations. |
| Hamamelis Virginiana Top Water | Skin Conditioner | No | Witch hazel distillate, a plant-derived astringent used in topical formulations to soothe and tone the skin. |
| Methyl Laurate | Emollient/Solvent | No | A fatty acid ester used as an emollient and solvent in topical formulations. |
| Methyl Stearate? | — | No | — |
| Microcrystalline Wax? | Stiffening Agent | No | A petroleum-derived wax used to adjust consistency in ointments and as a coating agent. |
| Phenoxyethanol | Preservative | No | A synthetic preservative used to prevent microbial growth in topical and some oral formulations. Can cause skin irritation in sensitive individuals. |
| Potassium Sorbate | Preservative | No | A potassium salt of sorbic acid used to inhibit mold and yeast growth in pharmaceutical formulations. |
| Propylene Glycol Dicaprylate? | — | No | — |
| Silicon Dioxide | Glidant | No | A mineral (silica) used to improve powder flow during tablet manufacturing. Also called colloidal silicon dioxide. |
| Sodium Acetate Anhydrous? | Buffer | No | A sodium salt of acetic acid used as a buffering agent in injectable and ophthalmic solutions. |
| Sodium Chloride | Tonicity Agent | No | Common table salt. Used to adjust the osmotic pressure of injectable and ophthalmic solutions to match body fluids. |