All of these results indicate that shark cartilage can be used to relieve osteo- and rheumatoid arthritis pain in at least 60% of sufferers. Since rheumatoid arthritis has been linked to psoriasis, this could also explain its effects on psoriasis. What the studies did indicate is that you need not wait five years to find if the treatment is effective or not: if you do not experience positive results within between four and six weeks, then shark cartilage treatment will likely not work for you.