Fish Oil (Omega-3 Fatty Acids) is used for the treatment of dyslipidemia and hypertriglyceridemia. Fish oil may affect platelet aggregation by a reduction in arachidonic acid and thromboxane and adenosine diphosphate receptor blockade. Fish oil may also potentially lengthen bleeding times 1) 2) 3).

1)
Goodnight SH, Jr, Harris WS, Connor WE. The effects of dietary omega 3 fatty acids on platelet composi- tion and function in man: a prospective, controlled study. Blood. 1981; 58:880–885
2)
Ang-Lee MK, Moss J, Yuan CS. Herbal medicines and perioperative care. JAMA. 2001; 286:208–216
3)
Stanger MJ, Thompson LA, Young AJ, et al. Anticoagulant activity of select dietary supplements. Nutr Rev. 2012; 70:107–117