it's not so much a question of how long it takes fish oil to get out of your body but more how long it will take to get the reaction to go away. that depends on how sensitive you are. if you aren't allergic put some benadryl gel on the rash or take a benadryl tablet (diphenhydramine) to help reduce the reaction. if you start having trouble breathing or get other symptoms of anaphylaxis see a doctor or the er immediately.
i took fish oil last night. got a rash which is now on trunk of body. how long does it take to get out of your body