1. Saving Your Brain by Jeff Victoroff, M.D.  A must read book for anyone with a desire to improve and maintain their mental faculties.  Loaded with well-written, easy-to-understand summaries of the latest research.
2. Grow Young with HGH by Ronald Klatz.  This book is about ten years old but is another must read book.  You cannot understand how to improve your libido, muscle mass and general body composition without understanding HGH (Human Growth Hormone).  HGH's effects are nothing short of astonishing and this book shows you how to increase it.
3. Keep Your Brain Alive by Lawrence C. Katz and Manning Rubin.  Workman Publishing 1999 (A nice (but somewhat outdated) list of studies and great exercises and ideas for building new neurons and new connections.  Written by a Ph. D. professor of neurobiology.)
4. The China Study by T. Colin Campbell and Thomas M. Campbell. Benbella Books 2006 (The author has a clear bias towards vegan diets.  However, he also presents an army of evidence of the many advantages of such a lifestyle.  A must read book for anyone concerned about their health.)
5. Achieving Optimal Memory by Aaron P. Nelson with Susan Gilbert.  McGraw-Hill 2005 (Written by a member of the Harvard Medical School Faculty.  This book is not quite as complete as the above 2 books, but it is a fast read and gives many nice summaries of the latest research.)
6. The Hardness Factor by Steven Lamm, M.D. Harper Collins 2005 (Great all around book by an M.D. whose practice deals with erectile dysfunction and curing ED naturally whenever possible. It's a little behind the times and incomplete but has a lot of the basics.)
7. Testosterone is Your Friend (Despite the cheesy title, this book does a good job of showing the general safety and importance of HRT (Hormone Replacement Therapy) for all males with low testosterone. It has a lot of great information and a listing of many clinical studies that show testosterone is good for the prostate and heart.)
8. The Testosterone Syndrome by Eugene Shippen, M.D. and William Fryer M. Evans & Co. 1998 (Shippen is an excellent apologist for testosterone and its importance for males. If you need to motivate yourself to boost your testosterone for some reason, this is an excellent book.)
9. The Testosterone Edge by Brian E. O’Niell Healthy Living Books 2005 (Not as cutting edge, but lots of good informiation.)

Best Sites 

1. http://www.smartskincare.com (Packed with great, scientifically-backed information on skin care. The site is run by a scientist - his posts are very helpful.  Yes, there are other males on the site.)
2. http://www.whfoods.com (Filled with great info and studies about various food, vitamins and minerals.  Excelent motivator and learning tool regarding whole, non-processed foods. Best way to find pages is actually though Google and typing in something like "whfoods" and "zinc".)
3. http://www.lef.org (This is the official site of the Life Extension Foundation and it is loaded with lots of good studies about supplements. The only problem is that they sell supplements and thus often leave out anything negative.  Almost all supplements have a downside and you will seldom hear about it on this site.)