Fishoil is vitamin D

http://heartscanblog.blogspot.com/2009/11/dr-david-grimes-reminds-us-of-vitamin-d.html

Fascinating analysis, but tells us what we all should know anyway - sunlight makes us feel better and if we can't get enough sunlight, there's a possible and well tested substitute: fish oil. Worth reading just to know how Eskimos used to get enough vitamin even with no citrus and no sunlight!