Absolute Nutrition F Block Fat Absorber 90 Capsules Per Bottle F Block by Absolute Nutrition is an effective fat blocker. Chitosan is a marine fiber derived from shellfish that has been shown to be effective in absorbing fat from the food eaten. F Block s chitosan ingredient is very high in it s quality and purity. F Block s chitosan goes through a special process called deacetylation, which facilitates the removal of acetyl groups. This is a process that increases the solubility of the chitosan fiber. The digestive enzyme lipase has been added to the F Block formula to help in emulsifying the fats that you ingest, making it a superior fat absorber. F Block is also fortified with calcium and vitamin C. The vitamin C aids in boosting the effectiveness of chitosan and the calcium is for healthy bones. Note This product is derived from shellfish. If you are allergic or sensitive to shellfish, you should avoid this product. Any fat soluble vitamins A, D, E K , medications, or fatty aci