The depth of penetration. The home superficial needling helps to enhance the penetration of active ingredients into superficial layer of your skin – stratum corneum.
To stimulate collagen production we need to make the skin bleed. This will allow platelets to release growth factors which stimulate collagen and elastin production which will help the skin become more rejuvenated and smoother.
Clinical studies have shown that the minimum depth required to stimulate collagen is 1mm. Recommended depth for heavy scarring from burns or acne is up to 3mm.