How Hexane solvent leftovers are removed from seed oil after extraction ? Does Activated Charcoal absorbs it ? Hexane leftovers after oils extraction is much more toxic to Kidneys & Liver than Omega 6 inflammatory content of seed oils. Nowdays even MCT oil is extracted using Hexane solvent. MCT at the biggining was derived by fractional distillation , not anymore it was time consuming but superior to initiate Ketons . Now even most expensive MCT oil has traces or high amount leftover of Hexane.