Silk Powder

Silk powder (typically finely milled silk fibroin/sericin used at low percentages in cosmetics) is generally well-tolerated and functions mainly as an absorbent/texture enhancer rather than a reactive active. However, silk proteins can trigger irritation or allergic contact reactions in a minority of sensitized individuals, and particulate/powder forms can be mechanically irritating on compromised eczema skin. Given sensitive-skin safety priorities and the documented (though uncommon) protein sensitization risk, it fits best as a gentle but not "exceptionally gentle" ingredient. Safety Notes: In mass-market leave-on skincare and cosmetics, silk powder (often listed as Silk Powder, Silk, Serica Powder, or Hydrolyzed Silk in powder form) is commonly used as a slip/soft-focus and sensory modifier at very low levels, with commercial products observed starting around ~0.05–0.2%. Higher-loading consumer-available powders/primers, body powders, and mattifying/finishing products (and some “silk” masks or lotions marketed for a silky feel) can use multi-percent levels, with the upper end in real-world OTC products reaching roughly 10–20% in anhydrous loose/pressed powder-type formats. Rinse-off formats typically sit toward the lower end due to cost and limited deposition, while the highest levels are mainly seen in dry powder products where stability and viscosity limits are minimal.