Potassium Sorbate is generally a lower-concern preservative for seborrheic dermatitis when used within applicable cosmetic conditions. It helps stop microbes growing in the product, but that does not mean it treats Malassezia or inflammation on the skin.

Even a permitted preservative can sting very irritated skin or sit in a formula that does not suit you. The useful question is whether the complete product remains comfortable, not whether Potassium Sorbate can be labelled a treatment. Discontinue repeated sources of burning, itching or redness.