Fat soluble toxins?  Not exactly a household term.  Fat soluble is commonly used to distinguish between two types of vitamins, fat soluble and water soluble. Fat soluble vitamins such as A, D, E and K are easily dissolved in fats and water soluble vitamins such as B Complex and C are readily absorbed in water.    When a substance is water soluble it is immediately absorbed into the blood stream (mostly water) and excreted through the kidneys.   When a substance is classified as fat soluble, it  has the ability to penetrate through our cells lipid bilayer and be absorbed directly into the cell and stored in tissues anywhere in our bodies.   Fat soluble substances are usually absorbed in fat molecules that travel through the lymphatic system of the small intestines and into the general blood circulation within the body.  If  we take too many vitamins, depending on it's solubility,  the excess will either be released immediately or stored throughout our body, which can reach toxic levels as the body accumulates year after year. So if our body can become toxic from excess fat-soluble vitamins, what other substances are unknowingly being stored in our tissues?