The authors of “The effects of apolipoprotein B depletion on HDL subspecies composition and function” (J .Lipid Res. 2016. 57: 674–686) have informed the Journal that the concentration of heparin sodium in the ApoB depletion method was incorrect. The correct precipitation method should state, “40 μl heparin sodium (35.4 mg/ml in 150 mM saline, final concentration 1.3 mg/ml).”