International Osteoporosis Foundation

The IOF website has a great “Risk Factor Quiz”

Bone Health and Osteoporosis Foundation

The BHOF website has a fantastic free "Boning Up" brochure on Osteo Health

Buff Bones

Mayo Clinic

Cleveland Clinic

National Council on Aging

Royal Osteoporosis Society

National Institutes of Health

UCSF Bone Health and Research Center

Harvard Medical School Bone Health Research

John Hopkins Metabolic Bone and Osteoporosis Center