Silk

Silk is a natural protein fibre produced by silkworm larvae. In skincare, it is typically processed into a fine powder or amino acid form (hydrolysed silk) that can be incorporated into creams, serums, and powders. The ingredient functions primarily as a bulking agent and texture enhancer.When applied to skin, silk proteins form a thin, breathable film that can improve the sensory experience of a product — often described as leaving a smooth, soft finish. The ingredient itself does not penetrate deeply into the skin; rather, it remains largely on the surface.

Silk proteins work primarily through physical rather than biochemical means. When hydrolysed into smaller peptides, they can bind to the outer layers of skin and form a protective, moisture-retaining layer. This film effect is responsible for the tactile smoothness and the mild barrier-support benefit.The proteins themselves contain amino acids such as glycine, alanine, and serine, which are naturally present in skin. However, their role in skincare is largely superficial; they do not meaningfully alter skin biology at the cellular level.

Silk works best as part of a layered routine rather than as a standalone treatment. Because it sits on the surface, apply it after lighter serums and before occlusive moisturisers if you wish to avoid trapping moisture or causing pilling. In powder formulations, a light dusting is sufficient; overuse can create a chalky appearance. If using a silk-containing serum or cream, follow the product's instructions for application frequency.

Silk is generally well-tolerated and rarely causes irritation or sensitisation. Those with a known silk allergy (rare) should avoid products containing this ingredient.