[stylinexpat]

Originally Posted by Pure It

They are virtually contaminant free b/c they do contain 0.9 mEq/kg peroxides (pharmaceutical allowable standard is 10 mEq/kg). The only way to completely prevent the formation of peroxides would require keeping them in an anaerobic environment.

The peroxide level determines the freshness and quality of the fish oil (assuming all other contaminants such as PCBs, pesticides, and heavy metals have been removed - Nordic Naturals uses distillation to do this). If your burps are fishy, this means your fish oil pills are becoming rancid. In other words, oxidation has taken place, forming higher levels of peroxides. These peroxides can have negative physiological effects.

Thanks for the tip..