One of the main biologically active components of the famous medicinal plant, Centella Asiatica, aka Gotu Kola. It has pretty well established wound healing, skin soothing and antioxidant activities.
There is also a study by La Roche Posay (belongs to L'Oreal) that examined the anti-aging effects of 5% Vitamin C combined with 0.1% Madecassoside. They mention that " Madecassoside is known to induce collagen expression
and ⁄ or to modulate inflammatory mediators thus might prevent and correct some signs of aging." The surprisingly long, 6-month study observed "significant improvement of the clinical score for deep and superficial wrinkles, suppleness, firmness, roughness, and skin hydration", but Vitamin C in itself is already an anti-aging superstar, so it is hard to know how much Madecassoside did.
Show me some proof
- Liu, Mei, et al. "Madecassoside isolated from Centella asiatica herbs facilitates burn wound healing in mice." Planta medica 74.08 (2008): 809-815.
- Haftek, Marek, et al. "Clinical, biometric and structural evaluation of the long‐term effects of a topical treatment with ascorbic acid and madecassoside in photoaged human skin." Experimental dermatology 17.11 (2008): 946-952.
- Sasmita, Andrew Octavian, et al. "Madecassoside activates anti‑neuroinflammatory mechanisms by inhibiting lipopolysaccharide‑induced microglial inflammation." International journal of molecular medicine 41.5 (2018): 3033-3040.