Highly bio-available vitamins, with chelated minerals that are angstrom sized, two requirements for minerals to be used by our bodies  Most vitamins source their calcium from chalk, a molecule way to large to enter cells, which in 20% of people go to kidney stones and other sclerotic (hardening) problems. I had a kidney stone a quarter at one time in my life and I was TIRED of that!!! Research showed me that I was in that 20% and I needed a vitamin that would give me absorbable calcium.  In 10 years of taking Vibe I have been kidney stone free and my bones are stronger than ever.  For more information and to sign up as a preferred customer, CLICK HERE