Chicken eggshell powder more effectively alleviates bone loss comparted to inorganic calcium carbonate: an animal study performed on ovariectomized rats.

This study aimed to evaluate the effects of chicken eggshell powder rich in calcium and the inorganic form of calcium carbonate on osteoporotic bone structure using an animal model of ovariectomized rats. Animals were divided into four groups: sham-operated rats (SHAM group); ovariectomized rats untreated (OVX group); OVX rats treated with eggshell powder (Biomin H® OVX + ECa group; total Ca content 1.5%); and OVX rats receiving inorganic calcium carbonate (calcium carbonate precipitated, total Ca content 1.5%; OVX + ICa group) during 8 weeks. Ovariectomy increased total body weight, plasma alkaline phosphatase activity, cortical bone thickness, periosteal bone apposition, and considerably worsened the trabecular bone microarchitecture. Calcium supplementation in both OVX + ECa and OVX + ICa groups elevated blood supply in the cortical bone when compared to OVX rats. Treatment with eggshell powder, unlike the OVX + ICa group, significantly lowered bone resorption, increased plasma calcium level, relative volume of trabecular bone, and secondary osteon population density, which together contributes to the enhanced bone strength. In addition, sizes of Haversian canals and secondary osteons in OVX + ECa group reached the values of SHAM group. Our results suggest that chicken eggshell powder more effectively ameliorates bone loss in ovariectomized rats than precipitated calcium carbonate.

Pharmacological agents and natural compounds: available treatments for osteoporosis.

Osteoporosis, a systemic skeletal disease characterized by a decrease in bone mass and deterioration of bone structure leading to an increased risk of fragility fractures, represents one of the major health problems worldwide. Currently, there are numerous pharmacological products used for the treatment of osteoporosis. Anti-resorptive drugs include bisphosphonates, hormone therapy, selective estrogen-receptor modulators, calcitonin, denosumab, calcium and vitamin D supplementation. Anabolic drugs such as teriparatide, strontium ranelate, romosozumab have recently become available based on advanced clinical trials. In recent years, combination therapy of anabolic and anti-resorptive agents is expected to be ideal anti-osteoporosis option. The adverse side effects caused by the long-term administration of pharmacological drugs have prompted researchers to study natural therapeutic compounds to find an alternative and effective way for osteoporosis treatment. Natural compounds including phytoestrogens with estrogenic effects (e.g. genistein, daidzein, icariin, dioscin, Ginkgo biloba), antioxidant and anti-inflammatory agents (e.g. acteoside, curcumin, resveratrol, Camellia sinensis), treatments that exert their effects by multiple actions (e.g. kinsenoside, berberine, Olea europaea, Prunus domestica, Allium cepa) could provide a safer alternative to primary pharmacological strategies. In this review, both pharmacological agents and natural compounds as available treatments for osteoporosis are characterized. In addition, possible mechanisms of action of all aforementioned treatments associated with bone remodelling, osteoclastogenesis, osteoblastogenesis, bone cell activity, death, and oxidative stress are presented. Nevertheless, more high-quality clinical studies with natural compounds are needed to provide greater evidence of the beneficial and safer antiosteoporotic application for the candidate.