| Foundation (especially liquid or cream) | Prevents separation and color change. |
| Concealers | Maintains consistent texture and coverage. |
| Cream Blushes & Highlighters | Protects the emollient base from oxidizing. |
| Scalp Treatments | For serums containing growth factors or sensitive actives. |
| High-End Hair Serums/Oils | Protects the integrity of the oils. |
| Hair Loss Treatments | Ensures the active ingredients remain potent. |

