| Sodium Metabisulfite | Antioxidant/Preservative | ⚠️ Yes — Sulfite | A sulfite compound used as an antioxidant and preservative. Can trigger severe reactions (bronchospasm, anaphylaxis) in sulfite-sensitive individuals, particularly asthmatics. |
| Yellow Wax | Stiffening Agent | ⚠️ Yes — Insect | Unbleached beeswax. Used to thicken and stabilize ointments and creams. Animal-derived (from bees) — relevant for vegan patients. |
| .alpha.-tocopherol Acetate | Antioxidant | No | Vitamin E acetate. Used as an antioxidant to protect active ingredients from degradation during storage. |
| Aluminum Hydroxide | Antacid/Adjuvant | No | An aluminum salt used as an antacid ingredient and as an adjuvant in some vaccine formulations. |
| Aluminum Oxide | Abrasive/Adsorbent | No | Alumina. Used as an adsorbent, abrasive, and processing aid in pharmaceutical manufacturing. |
| 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. |
| Caramel | — | No | — |
| Carbomer Copolymer Type A (allyl Pentaerythritol Crosslinked)? | Thickener/Gelling Agent | No | A crosslinked acrylic acid copolymer used to create clear gels and thicken topical formulations. |
| 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. |
| Dimethicone 12500? | — | No | — |
| Dimethicone 20 | Skin Protectant | No | A silicone-based polymer used as a skin protectant, emollient, and anti-foaming agent in topical formulations. |
| Dipalmitoylphosphatidylglycerol, Dl-? | Surfactant/Stabilizer | No | A synthetic phospholipid used as a lung surfactant component and stabilizer in inhaled 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. |
| 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 Isostearate | Emulsifier | No | A glycerin ester used as an emulsifier and skin-conditioning agent in topical formulations. |
| Glyceryl Monocaprylate? | Penetration Enhancer/Emulsifier | No | A glyceride ester used to enhance skin penetration and as an emulsifier 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. |
| Hyaluronate Sodium | Moisturizer/Viscosity Agent | No | Sodium hyaluronic acid. A naturally occurring substance used as a moisturizer and viscosity agent in ophthalmic and 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. |
| Laureth-2 | Emulsifier/Solubilizer | No | A non-ionic surfactant used as an emulsifier and solubilizer 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. |
| Methyl Laurate | Emollient/Solvent | No | A fatty acid ester used as an emollient and solvent in topical formulations. |
| Methyl Salicylate? | Flavoring/Counterirritant | No | Oil of wintergreen. Used as a flavoring agent and topical counterirritant (creates a warming sensation). Can cause sensitivity in aspirin-intolerant individuals. |
| Microcrystalline Wax? | Stiffening Agent | No | A petroleum-derived wax used to adjust consistency in ointments and as a coating agent. |
| Milk Protein Concentrate? | — | No | — |
| N,n-dimethylacetamide? | Solvent | No | An organic solvent used in transdermal and topical formulations to dissolve active ingredients. |
| Octyldodecanol? | Emollient/Solvent | No | A branched-chain fatty alcohol used as an emollient, solvent, and viscosity adjuster in topical formulations. |
| Propylene Carbonate | Solvent | No | An organic solvent used in transdermal patches and topical formulations to dissolve active ingredients. |
| Silicon Dioxide | Glidant | No | A mineral (silica) used to improve powder flow during tablet manufacturing. Also called colloidal silicon dioxide. |
| Sodium Alginate | Thickener/Binder | No | A natural polysaccharide from seaweed used as a thickener, binder, and sustained-release agent. |
| Sodium Chloride | Tonicity Agent | No | Common table salt. Used to adjust the osmotic pressure of injectable and ophthalmic solutions to match body fluids. |
| Squalane | Emollient | No | A saturated hydrocarbon used as an emollient and moisturizer. Originally from shark liver oil, now commonly plant-derived (olive or sugarcane). |
| Stearalkonium Chloride? | Conditioning Agent | No | A quaternary ammonium compound used as a conditioning and antistatic agent in topical formulations. |
| Stearic Acid | Lubricant | No | A fatty acid used as a lubricant in tablet manufacturing. |
| Triacetin? | Plasticizer | No | Glyceryl triacetate. A plasticizer used in film coatings to make them flexible and prevent cracking. |