Silagic Superconcentrated gel Arrived Biological Silicium, harpagophyte, Wintergreen, katrafray and black pepper essential oils 50ml SilagicTM Gel is a super-concentrated joint gel developed in France by Pharmaviva Laboratories. Applied with a massage to painful areas, SilagicTM provides immediate relief from everyday joint pain. Its unique formula combines highly concentrated active ingredients for maximum effectiveness.