I can say that a high quality fish oil supplement (molecularly distilled to filter out PCB's, Hg, heavy metals, and dioxanes and standardized for EPA & DHA), A high quality evening primrose oil supplement (cold-expeller-pressed, hexane-free and standardized for 10% GLA), along with a good multi-vitamin (Life extension mix is best, but there are cheaper ones out there) and possibly some extra anti-oxidants (such as Dr. Dave's "Boost" which is the KING of anthocyanin content) will certainly fit the bill.
For more reading on this, DLD, I would STRONGLY recommend "Fats That Heal, Fats That Kill" by Udo Erasmus.
However, I honestly cannot say how much, if any, these supplements will aid you in Penis Enlargement. I WILL say that these supplements should definitely be the cornerstone of any long-term supplementation program for overall health, but obviously the exercises themselves are THE most important part of any Penis Enlargement program (warning to those who are thinking of buying into [words=http://www.mattersofsize.com/join-now.html]Penis Enlargement pills[/words]: they don't work). If it is possible to grow 5" WITHOUT any supplements like the above, then they must not be absolutely crucial...that isn't to say they couldn't have made those 5" come quicker, but who's to judge that?