Hydroxypropyl Starch Phosphate is generally a lower-concern ingredient for seborrheic dermatitis. It is a modified starch used to thicken, bulk or improve texture rather than a fatty oil, fragrance or treatment active.

No applicable exact-ingredient human seb derm or Malassezia evidence was found. Because it mainly changes how a formula feels and flows, other ingredients are more likely to determine whether the product suits inflamed skin. Powders can still feel drying in some formulas.