Researchers at the University of Calgary are hoping a one-of-a-kind machine will help them determine the best dosage of vitamin D for improving bone health.

The Xtreme CT2 machine is the only one of its kind in the world and will be used to study volunteers and provide detailed information on how much vitamin D a person should take.

"We know that 800 [units] is what's recommended by Health Canada but there are a lot of factors that go into that recommendation," said researcher Steven Boyd. "From a bone point of view, it's quite possible that 800 is not enough to have a big impact on our bones."

Health Canada suggests people take between 800 and 2,000 international units of vitamin D per day.

However, volunteers in the study will be split into groups taking amounts both greater than and less than that recommendation.

The groups — made up of volunteers between the ages of 55 and 70 — will take either 400, 4,000 or 10,000 units per day.

The Xtreme CT2 will be able to detect the tiny details in the bones that researchers say will demonstrate whether vitamin D is making a difference.

The university is looking for 300 volunteers between the ages of 55 and 70 for the study. To participate contact the research team at or by calling 403-220-3888.