- Firming, Hydrating Concentrate. Enliven aging skin with this face firming concentrate that is packed with 20 plant extracts. This non-greasy hydrating fluid absorbs quickly to tone the skin and tighten facial contours. While it can be partnered with any Yon-Ka cream, it is ideally suited to work in harmony with Phyto 52. Skin becomes smoother and tighter. Face and neck lines are redrawn.