Sunscreens typically require a high amount of oil to both solubilize organic UV filters and improve the feel of the lotion on skin. As most non-polar preservatives are hydrophobic, they tend to migrate into the oil phase, leaving the water phase poorly protected.    The quest for a polar preservative to protect the water phase and mitigate the risk of contamination has proved a challenge, but one Sharon Laboratories has weathered.       SharoSENSE Plus 184’s highly active preserv...