I bought some supplements over the internet, and as a result the company now send me a newsletter. In the mosty recent one there's an article "Tips for healthy joints". One of the 'experts' says:
[quote]...Include oily fish in the diet, such as salmon or mackerel up to 3 time a week. If you are vegetarian, eat nuts and seeds on a daily basis or supplment the diet with a fish oil food supplement.