| Cetyl Alcohol | Emulsifier/Thickener | ⚠️ Yes — Cetyl Alcohol | A fatty alcohol used in topical formulations. Can cause contact dermatitis. |
| Methylparaben | Preservative | ⚠️ Yes — Parabens | A preservative used to prevent microbial growth. Can cause allergic contact dermatitis in sensitive individuals. |
| Propylene Glycol | Solvent/Humectant | ⚠️ Yes — Propylene Glycol | An organic compound used as a solvent and humectant. Can cause contact dermatitis in sensitive individuals. |
| Propylparaben | Preservative | ⚠️ Yes — Parabens | A paraben preservative used to prevent microbial growth. Can cause contact dermatitis in paraben-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. |
| Sodium Sulfite | — | ⚠️ Yes — Sulfite | — |
| .alpha.-tocopherol Acetate | Antioxidant | No | Vitamin E acetate. Used as an antioxidant to protect active ingredients from degradation during storage. |
| Beta Carotene | — | No | — |
| Boric Acid | Buffer/Preservative | No | A mild antiseptic and buffering agent commonly used in ophthalmic solutions and topical formulations. |
| Cocoyl Caprylocaprate | Emollient/Solvent | No | A coconut-derived ester used as an emollient and oily vehicle in 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. |
| Cottonseed Oil? | Solvent/Vehicle | No | An oil extracted from cotton seeds, used as a vehicle in injectable and oral formulations. Highly refined grades generally considered safe for most individuals. |
| Dmdm Hydantoin | Preservative | No | A formaldehyde-releasing preservative used to prevent microbial growth. Can cause contact dermatitis in formaldehyde-sensitive individuals. |
| Edetate Sodium | Chelating Agent | No | A sodium salt of EDTA used to bind metal ions, preventing degradation of active ingredients and preserving formulation stability. |
| Glyceryl Monostearate | Emulsifier | No | An emulsifier that helps oil and water mix in creams and ointments. Derived from glycerin and stearic acid. |
| Glyceryl Stearate Se | Emulsifier | No | Self-emulsifying glyceryl stearate. A lipid-based emulsifier used to stabilize creams and lotions. |
| Hamamelis Virginiana Top Water | Skin Conditioner | No | Witch hazel distillate, a plant-derived astringent used in topical formulations to soothe and tone the skin. |
| Lemon Oil, Cold Pressed | Flavoring/Fragrance | No | A citrus essential oil used as a flavoring and fragrance agent. Contains limonene, which can cause contact sensitization. |
| Orange Peel | — | No | — |
| Pentetic Acid | — | No | — |
| Polyethylene Glycol 400 | Solvent/Plasticizer | No | A low-molecular-weight PEG used as a solvent and plasticizer in oral and topical formulations. Rare but documented allergic reactions to PEG compounds. |
| Polyethylene Glycol 4500 | — | No | — |
| Raspberry Juice? | — | No | — |
| Stearic Acid | Lubricant | No | A fatty acid used as a lubricant in tablet manufacturing. |
| Vitamin E Polyethylene Glycol Succinate? | Solubilizer/Emulsifier | No | A water-soluble form of vitamin E (also called TPGS) used to improve the absorption of poorly soluble drugs. Contains a PEG component. |
| 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. |