I do, but there's a lot that it can be. Most likely, it's associated—in some way—with aging/natural degeneration (unless there is some injury/disease factor).
If you want to try supplements, my advice is to research them well; there are more charlatans/quacks & snake oil out there than real therapy.
Quote:
There is no scientific evidence that shark cartilage is useful in treating or preventing cancer or other diseases.[1][2] Controlled trials have shown no benefit to shark cartilage supplements,[3] and shark cartilage contains potentially toxic compounds linked to Alzheimer disease and amyotrophic lateral sclerosis.
http://en.wikipedia.org/wiki/Shark_cartilage
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Cavet Emptor.
Doc