SYNOXYL HSS ia an excellent photostabiliser for Avobenzone. The photostabilizing effect of SYNOXYL HSS arises from triplet-state energy transfer from avobenzone to Synoxyl® HSS and through light-induced reactions that preserve the main chromophores. It provides in-vivo SPF boosting by 50% for both organic and inorganic sunscreens when alone it has no contribution to SPF. It protects skin by inhibiting up-stream ROS cascade. Easy to use in sunscreen sprays & oils Use of Avobenzone, HMS, OS with Synoxyl® HSS provides cost-effective, broad spectrum high SPF 50+ (critical wavelength of well over 370 nm) sunscreens. Easy to make Octocrylene & Oxybenzone free sunscreens.