Bio-adhesive supplement repairs and strengthens the fish’s natural slime coat which protects against bacterial and fungal infections Bactershield is a revolutionary new way to help maintain fish optimum health. Proven, natural oils and extracts are combined with a patented film forming matrix to help repair and strengthen a fish’s natural slime coat and help provide a protective shield around your fish. A fish’s slime coat acts as the first line of defense for fish against bacterial and fungal infections. Active Ingredients: Chitosan, Cinnamon Oil, D-Limonene, Geranium Oil, Pine Oil, Rosemary Oil