| Alcohol | Solvent/Preservative | ⚠️ Yes — Alcohol | Ethanol (ethyl alcohol) used as a solvent, preservative, or extraction agent. Present in many liquid formulations. May be relevant for patients avoiding alcohol for medical or religious reasons. |
| Dipropylene Glycol | Solvent/Humectant | ⚠️ Yes — Propylene Glycol | A synthetic glycol used as a solvent and humectant in topical formulations. |
| Isostearyl Alcohol? | Emollient/Emulsifier | ?Uncertain — Stearyl Alcohol | A branched-chain fatty alcohol used as an emollient and emulsifier in topical formulations. |
| Methylparaben | Preservative | ⚠️ Yes — Parabens | A preservative used to prevent microbial growth. Can cause allergic contact dermatitis in sensitive individuals. |
| 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. |
| Aluminum Hydroxide | Antacid/Adjuvant | No | An aluminum salt used as an antacid ingredient and as an adjuvant in some vaccine formulations. |
| Barium Sulfate | — | No | — |
| Brown Iron Oxide | — | No | — |
| Butylated Hydroxytoluene | Antioxidant | No | BHT. A synthetic antioxidant used to prevent oxidative degradation of fats and oils in pharmaceutical products. Rare contact sensitivity reported. |
| Butylene Glycol | Humectant/Solvent | No | A synthetic glycol used as a humectant and solvent in topical formulations. Helps products spread smoothly on skin. |
| 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. |
| Citric Acid Monohydrate? | pH Adjuster/Buffer | No | Citric acid in its hydrated form. Used to adjust acidity and as a buffering agent. Derived from citrus fruits or fermentation. |
| 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 20 | Skin Protectant | No | A silicone-based polymer used as a skin protectant, emollient, and anti-foaming agent in topical formulations. |
| Dimethicone 200? | Skin Protectant/Emollient | No | A specific viscosity grade of dimethicone (polydimethylsiloxane). Used as a skin protectant, emollient, and anti-foaming agent. |
| Dimethiconol/trimethylsiloxysilicate Crosspolymer (40/60 W/w; 1000000 Pa.s)? | Skin Conditioner | No | A silicone elastomer blend used in topical formulations to provide a smooth, silky feel and improve product spreadability. |
| Disodium Citrate Sesquihydrate? | Buffer | No | A sodium salt of citric acid used as a buffering agent to maintain pH stability in pharmaceutical solutions. |
| Edetate Trisodium | — | No | — |
| 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. |
| Glycine | Buffer/Stabilizer | No | The simplest amino acid. Used as a buffer, stabilizer, and tonicity agent in injectable 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. |
| 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. |
| Microcrystalline Wax? | Stiffening Agent | No | A petroleum-derived wax used to adjust consistency in ointments and as a coating agent. |
| Octyldodecanol? | Emollient/Solvent | No | A branched-chain fatty alcohol used as an emollient, solvent, and viscosity adjuster in topical formulations. |
| Phenoxyethanol | Preservative | No | A synthetic preservative used to prevent microbial growth in topical and some oral formulations. Can cause skin irritation in sensitive individuals. |
| Sodium Stearyl Fumarate? | Lubricant | No | A tablet lubricant used as an alternative to magnesium stearate. Vegetable-derived. |
| Soybean Phosphatidylcholine? | — | No | — |
| 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. |
| Threonine? | — | No | — |
| Tocopherol | Antioxidant | No | Natural vitamin E. Used as an antioxidant to protect active ingredients from oxidation and extend product shelf life. |
| Trehalose Dihydrate | Stabilizer/Cryoprotectant | No | A natural disaccharide used to stabilize proteins in freeze-dried formulations and to protect biological products. |
| Xylitol | Sweetener | No | A sugar alcohol used as a sweetener in chewable tablets and oral formulations. Can cause GI symptoms (bloating, diarrhea) in sensitive individuals. |