Best Source of N-acetylglucosamine & N-acetylgalactosamine?

Hi schlüggell,

It sounds like you know your stuff.  Thank you very much. 

Now that I have that issue behind me, I've got another question that you (or someone else) might be able to answer.

I'm putting together a glyco mix using both foods and supplements.  The only essential sugars I lack are N-acetylglucosamine and N-acetylgalactosamine.  Restricting my choice to either a high quality Shark Cartilage or a high quality Aloe Vera extract, which would be the better source, gram per gram?

Thanks again, schlüggell!

In health,

Paul