What is the best material to carry cells and drugs that you can inject in the disc to repair it and reduce pain?

Question: What is the best material to carry cells and drugs that you can inject in the disc to repair it and reduce pain?
- Keywords:
  cell,
  drug,
  material,
  pain
Asked by 948newp22 to Kieran on 9 Nov 2018.
- Kieran answered on 9 Nov 2018:
  
  We find that collagen is best to grow cells on. Collagen is a material that is found in your skin and joints! The cells like this material because its like the inside of the body.
  
  We are always searching for new drugs to inject with our materials. Right now steroids are used in hospitals which work sometimes but not always! We’re trying to use new drugs that work better and more often.

Question: What is the best material to carry cells and drugs that you can inject in the disc to repair it and reduce pain?