The aim of this study was to evaluate the safety and tolerance of ClinOleic or Lipoplus or SMOFlipid lipid emulsions. After 6 weeks of each lipid emulsion, Omegaven (fish oil) was added for a further 4 weeks. The safety and tolerance was evaluated after each lipid emulsion cycle by biochemistry, hematology and coagulation variables, vital signs and adverse events. We also analysed fatty acid profiles in plasma or erythrocyte phospholipids, antioxidant enzyme activities, lipid peroxidation products, plasma lipids and pro-inflammatory cytokine production after in vitro stimulation of whole blood by lipopolysacharide in HPN patients. The non-interventional group of healthy controls was included for comparison.