Also available in 1 mg, 10 mg, 25 mg, 50 mg, 100 mg and bulk. Please contact Fisher for quotes. 9-hydroxy Stearic Acid is a hydroxy fatty acid that is the active metabolite of 9-PAHSA. 9-hydroxy Stearic Acid is formed from 9-PAHSA through carboxyl ester lipase in the liver and pancreas. The 9-hydroxy Stearic Acid (5 uM) was stearic acid, which inhibited the expression of histone deacetylase 1 (HDAC1) in the lysate of HT-29 colon cancer cells. 3. When the concentration was 100 uM.1, the proliferation of HT-29 cells was inhibited and cell cycle arrest was induced in G0/ g1 phase. Purity 99.7%