Reply To: My dr recommended I take 2 teaspoon cod liver oil plus 40,000 iu daily one week 30,000 next, 20,000, next and tehn end with taking 10,000iu for awhile after. I did this one day of taing 40,000iu and two teaspoon cod liver oil and about 30 minutes later my back felt like burning, then felt like peeing internally in my back, then been sore ever since. Had mri and they see nothing wrong back there. Now I seem to not be able to control body temp. Could this be a negative effect of vit d and cod liver oil? Is it normal to take vit d and cod liver oil in this high dosage?