EGGSHELL POWDER (ESP), upcycled glass jar * Locally pasture-raised eggs * Economical, natural, wholefood source of elemental calcium for those that do not feed bones (whole or ground) as a part of the daily diet. * Eggshell Powder is a good calcium choice when preparing DIY meals for animals in chronic renal failure (CRF) because it acts as a mild phosphorus binder. * The eggshell membrane mainly consists of protein in the form of collagen plus small amounts of chondroitin sulfate, glucosamine and other nutrients considered beneficial for the joints. A natural calcium supplement to balance the naturally occurring phosphorus in home-prepared (DIY) fresh food diets.