Possible to Have Cartilage Regrowth After Rhinoplasty?

The options for non-surgical improvement are limited.  The best option for a lack of cartilaginous support would be a cartilage graft from the ears, septum, or rib.  These are viable options. 

The only way to give you what you need is with surgery. See an experienced revision rhinoplasty surgeon and you can achieve what you want. If creams worked we would all use them.

There have been scientific studies where cartilage cells have been grown in a laboratory. There is a great photo of a mouse with an ear growing on it's back. Unfortunately this ear didn't maintain it's shape. It has been predicted to be a number of years before this is practical for human surgical application. No creams, herbs or vitamins will help surgically removed cartilage grow back. Revision rhinoplasty has advanced so natural looking noses can be achieved, but usually require cartilage grafts from either your nasal septum, ear or sometimes rib.

The cartilage that was removed is not going to grow back.  Cartilage growing research is a long way from medical use in humans, though it is progressing.  For now, if you need more cartilage on the tip of your nose, it will need to be harvested from elsewhere on your body.  Most commonly the cartilage is taken from inside of the nose (septum) but this may not be available depending on what was done with your first surgery.  The ear is the typical second choice and the lower ribs is third, especially if you need large rigid pieces.

Some surgeons will use artificial material like silastic in the nose, but I prefer not to as the material can extrude, even years after the surgery.

It is important to meet with the surgeon who performed the procedure to outline your concerns.  An under projected nose can result from many different factors. If you are still unhappy after meeting with the primary surgeon a second opinion is in order.  At the present time it not possible for you to regrow the cartilage in your nose.