Sponge Spicules / “Liquid Microneedling”
Microscopic needle-shaped structures — usually silica (SiO₂) from marine sponges such as Haliclona — that act as a physical delivery system rather than an active in their own right. Massaged into skin, they create temporary micro-channels in the stratum corneum that help larger actives penetrate, while their sharp edges exfoliate and nudge cell turnover. They embed and dissolve over roughly 72 hours, which is why a prickling sensation lingers afterwards. On labels they appear as Hydrolyzed Sponge, Sponge Spicule or Spongilla.
Spicules don't have an effective percentage the way an active does — what matters is the spicule load and, more importantly, the actives you're driving deeper. The benefit rides on the co-formulated ingredients; on their own, spicules mainly exfoliate.
Use at night, 1–3× a week — not daily — massaged gently into clean, dry skin, then follow with the serum you want pushed deeper. Expect tingling and mild flaking for up to 72 hours, and always wear SPF the next day. Skip them on active acne, rosacea, eczema or compromised skin, where they can prolong irritation. Caution: a 2025 JAAD letter raised safety concerns about at-home silica spicules — treat them as a supportive tool, not a replacement for clinical microneedling.
Build a routine using Skin Stacker's free AI-powered tool — decode any product, check ingredient compatibility, and get a personalised AM/PM schedule.
Open Skin Stacker →