Multiple sclerosis. It's a debilitating, progressive disease that typically only gets worse, but much to the surprise of many doctors, Debbie Bertrand's symptoms have improved instead of progressing.

"The last time I walked into this building I had to use the wheelchair, couldn't even walk, so this is a big day for me!" she said.

Debbie was visiting Celltex, a Houston company that's has been preserving her own stem cells since 2011.

She was one of the first patients to receive treatments using stem cells taken from fat cells, which are then re-injected into her body.

"I had pretty high expectations, but I think they've exceeded anything I could've ever hoped for. My doctors are still blown away because you're never supposed to get better when you have MS, but my quality of life is just so much better," said Debbie.

The company claims stem cell injections have also helped patients with joint diseases and Parkinson's. CEO David Eller says he was healed of knee pain.

"We're happy that it's working and we're happy for people like Debbie Bertrand. A lot of people don't have the time to wait 10 years and find out if it's going to be legal or not," he said.

The study of stem cells is legal, but not the actual injections, so Celltex ships them to Mexico where the injections take place.

For now, the Food and Drug Administration views stem cells as a drug and these treatments have not been approved.