Cosmetics Formulation Development

If you want to produce pure formula Retinol in oil can put Retinol max How many percent (as permitted) and the base oil that is not clogged? Which one should you choose to mix? In what proportion? I want a normal bass oil because I want to see individual results Retinol only (I used it in my research) Please advise which one to mix, thank you.

Hello, FDA does not set the maximum rate to use Retinol