Sapienic acid sodium is a fatty acid commonly found on the skin and in mucosa. Sapienic acid sodium has variable antimicrobial activities against Gram-positive and Gram-negative bacteria found on the skin and in the oral cavity. Sapienic acid sodium is active against Streptococcus sanguinis, Streptococcus mitis and Fusobacterium nucleatum with MBC values of 31.3 μg/mL, 375.0 μg/mL and 93.8 μg/mL, respectively.IC50 & Target: MBC: 31.3 μg/mL (Streptococcus sanguinis), 375.0 μg/mL (Streptococcus mitis) and 93.8 μg/mL (Fusobacterium nucleatum)In Vitro: Sapienic acid (minimum bactericidal concentrations (MBCs) range, 31.3 to 375.0 μg/mL) is active against Streptococcus sanguinis, Streptococcus mitis, and Fusobacterium nucleatum but not active against Escherichia coli, Staphylococcus aureus, S. marcescens, P. aeruginosa, Corynebacterium bovis, Corynebacterium striatum, and Corynebacterium jeikeium (MBC > 500 μg/mL). Kinetic assays show that killing of S. sanguinis and S. mitis with sapienic acid is gradual and occurred within 24 h.