| 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. |
| Propylene Glycol? | Solvent/Humectant | ?Uncertain — Propylene Glycol | An organic compound used as a solvent and humectant. Can cause contact dermatitis in sensitive individuals. |
| Sodium Benzoate | Preservative | ⚠️ Yes — Sodium Benzoate | A food preservative. Can cause urticaria and exacerbate asthma in sensitive individuals. |
| Soybean Oil? | Solvent/Vehicle | ?Uncertain — Soy | Derived from soybeans. May trigger reactions in individuals with soy allergy. |
| .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. |
| Anhydrous Citric Acid | pH Adjuster/Buffer | No | Water-free citric acid used to adjust pH and enhance drug stability. Typically derived from fermentation of corn sugar. |
| Candelilla Wax | Coating/Stiffening Agent | No | A plant-derived wax from the candelilla shrub. Used as a coating agent and to thicken formulations. Vegan alternative to beeswax. |
| Carnauba Wax | Coating/Polish | No | A natural wax from the leaves of the Brazilian palm tree. Used to polish and gloss-coat tablets. Plant-derived. |
| 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. |
| Diisopropyl Adipate? | Emollient | No | A synthetic ester used as a light emollient and skin-conditioning agent in topical formulations. |
| Dimethicone 20 | Skin Protectant | No | A silicone-based polymer used as a skin protectant, emollient, and anti-foaming agent in topical formulations. |
| Ethylhexyl Hydroxystearate? | Emollient | No | A synthetic ester used as an emollient and skin-conditioning agent in topical formulations. |
| 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. |
| Ferric Oxide Yellow | Colorant | No | Yellow iron oxide pigment used in tablet coatings and capsule shells. A mineral-based colorant. |
| Ferrosoferric Oxide | Colorant | No | Black iron oxide used as a pigment in tablet coatings and capsule shells. Derived from iron, not from food allergen sources. |
| 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 Ricinoleate | Emulsifier/Emollient | No | A glyceride ester of ricinoleic acid (from castor oil) used as an emulsifier and skin-conditioning agent. |
| Hamamelis Virginiana Top Water | Skin Conditioner | No | Witch hazel distillate, a plant-derived astringent used in topical formulations to soothe and tone the skin. |
| Isopropyl Isostearate? | Emollient | No | A synthetic ester used as an emollient and skin-conditioning agent in topical formulations. |
| Isopropyl Myristate | Emollient/Penetration Enhancer | No | A synthetic ester used as an emollient and to enhance penetration of active ingredients through the skin. |
| Isostearic Acid | Emollient/Emulsifier | No | A branched-chain fatty acid used as an emollient and co-emulsifier in topical formulations. |
| Levomenthol? | Counterirritant/Flavoring | No | The natural isomer of menthol. Produces a cooling sensation and is used as a counterirritant and flavoring agent. |
| Polyoxyl 15 Hydroxystearate? | — | No | — |
| Potassium Sorbate | Preservative | No | A potassium salt of sorbic acid used to inhibit mold and yeast growth in pharmaceutical formulations. |
| Propylene Carbonate | Solvent | No | An organic solvent used in transdermal patches and topical formulations to dissolve active ingredients. |
| Safflower Oil | Emollient/Vehicle | No | A plant-derived oil used as an emollient and vehicle in topical and oral formulations. |
| Shea Butter | Emollient | No | A fat extracted from the nut of the African shea tree. Used as an emollient and moisturizer in topical formulations. Tree nut-derived — may be relevant for individuals with tree nut allergies. |
| Silicon Dioxide | Glidant | No | A mineral (silica) used to improve powder flow during tablet manufacturing. Also called colloidal silicon dioxide. |
| Sodium Chloride | Tonicity Agent | No | Common table salt. Used to adjust the osmotic pressure of injectable and ophthalmic solutions to match body fluids. |
| Stearalkonium Chloride? | Conditioning Agent | No | A quaternary ammonium compound used as a conditioning and antistatic agent in topical formulations. |
| Tocopherol | Antioxidant | No | Natural vitamin E. Used as an antioxidant to protect active ingredients from oxidation and extend product shelf life. |
| Trideceth-10? | — | No | — |
| Undecylenic Acid? | — | No | — |
| Xanthan Gum | Thickener/Stabilizer | No | A polysaccharide produced by bacterial fermentation, used to thicken and stabilize liquid and semi-solid formulations. Derived from corn sugar fermentation — may be relevant for corn-sensitive individuals. |