| Propylene Glycol | Solvent/Humectant | ⚠️ Yes — Propylene Glycol | An organic compound used as a solvent and humectant. Can cause contact dermatitis in sensitive individuals. |
| .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. |
| Aluminum Hydroxide | Antacid/Adjuvant | No | An aluminum salt used as an antacid ingredient and as an adjuvant in some vaccine formulations. |
| Aminomethylpropanol | pH Adjuster | No | An amino alcohol used to neutralize carbomer gels and adjust pH in topical formulations. |
| Cyclomethicone 5 | Emollient/Carrier | No | A volatile silicone that evaporates quickly, leaving a smooth feel. Used as a carrier and emollient in topical products. |
| Dibutyl Sebacate? | Plasticizer | No | A plasticizer used to make tablet coatings more flexible and resistant to cracking. |
| 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. |
| 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. |
| 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. |
| Isopropyl Isostearate? | Emollient | No | A synthetic ester used as an emollient and skin-conditioning agent in topical formulations. |
| Lactic Acid | pH Adjuster/Exfoliant | No | An alpha-hydroxy acid used to adjust pH and as a mild exfoliant in topical formulations. Produced by fermentation. |
| Lanolin Oil? | Emollient | No | An oil derived from sheep wool (lanolin). Used as an emollient and skin conditioner. Animal-derived — relevant for vegan patients. Can cause contact dermatitis in lanolin-sensitive individuals. |
| Magnesium Stearate | Lubricant | No | A lubricant that prevents ingredients from sticking to manufacturing equipment. |
| Phenoxyethanol | Preservative | No | A synthetic preservative used to prevent microbial growth in topical and some oral formulations. Can cause skin irritation in sensitive individuals. |
| Serine | — | No | — |
| 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. |
| Sodium Lactate | — | No | — |
| Sodium Stearyl Fumarate? | Lubricant | No | A tablet lubricant used as an alternative to magnesium stearate. Vegetable-derived. |
| Sorbitol | Sweetener/Humectant | No | A sugar alcohol used as a sweetener and humectant. Can cause gastrointestinal symptoms (bloating, diarrhea) in sensitive individuals or at high doses. Relevant for those following a low-FODMAP diet. |
| Talc | Glidant/Lubricant | No | A mineral used to improve powder flow in manufacturing. |
| Titanium Dioxide | Colorant/Opacifier | No | A white pigment used for coating opacity. Under regulatory review in some countries. |
| Urea | — | No | — |