A Guide to Actives Compatibility

Layering too many active ingredients often results in a neutralised routine or compromised product integrity. When ingredients are applied in rapid succession without regard for their chemical nature, they may degrade or fail to absorb properly. This guide focuses on the mechanical and physical compatibility of common home-use ingredients.

Order of application follows the principle of lightest viscosity to heaviest. However, pH and ingredient stability require a more nuanced understanding to ensure each component functions as intended.

1. Cleanse and balance. Begin with a neutral cleanser to remove surface debris. Avoid using acidic cleansers if you intend to layer high-concentration actives later, as this alters the baseline pH of the barrier. Pat the skin until slightly damp to encourage even distribution of subsequent products.
2. Apply water-based actives. Distribute your water-based serums or toners onto the skin. Allow these to fully absorb for at least two minutes before proceeding. This step is critical because water-based formulas cannot penetrate a later-applied oil-based film.
3. Introduce oil-soluble components. Apply oil-based serums or thicker emulsions next. The oil content acts as an occlusive, which seals in the water-based layer beneath it. Ensure even coverage without excessive friction.
4. Apply moisture barrier. Apply your primary moisturiser to lock in the previous layers. This acts as the final buffer against environmental evaporation. Focus on the perimeter of the face and move inward.
5. Final settling. Leave the skin undisturbed for five minutes to allow the complete routine to settle. Check for any product pilling or residue on the skin surface. If pilling occurs, reduce the quantity of the final layer.

Simple routines are more predictable than complex ones; layering requires patience and physical space.