I'm also allergic to shellfish. Dang.

Some sites do not give dosage suggestions. WebMD does not for example.

I am seeing a few websites suggest 1500-2500mg a day. This is because of poor absorption. Expect some to remain in the GI tract, and for those with GI disturbances, that aspect will be helpful.

Notice that one needs to use divided doses (this is common with some other nutrients as well like acetyl carnitine). I am finding that this supplement is not easily absorbed. One study used Poly-NAG--but this is not available to the public except in one produce by Country Life (with only 50mg in 3 caps).

http://www.ncbi.nlm.nih.gov/pubmed/9001835



I am definitely going to try this, however. My knee and ankle are swelling up now and then, causing me to be much less mobile. And I just had 2 spells of GI trouble this summer. So far the Kefir I was recommended is helping that, but it might be that N-A-G may also help.

I do not know if absorption of the products available now at iherb.com will be enough for MSers.