The egg yolks, especially, contain some important building blocks for testosterone. For example, egg yolks contain cholesterol and testosterone is produced from cholesterol. Now, before you think you're going to clog up your arteries, don't be too concerned. Most people don't realize that actually 85% to 95% of your cholesterol is made by your liver, and not from the foods you eat. Eggs yolks are also jam packed with other crucial nutrients and vitamins. Also, there are two types of cholesterol: LDL (good) and HDL (bad). The dietary cholesterol in egg yolks helps lower HDL and maintain LDL in a desirable range. Good, balanced cholesterol = optimal environment for T production. Your body manufacturers the lion's share of its cholesterol: diet is a minor contributor. I consume about 10 yolks (and about 30 whites, both from whole eggs) 4 days a week, and about 6 yolks on the other 3. Ever since I have, my bodyfat% has dropped (with a proper diet and exercise program), and my T levels have skyrocketed! Before you think I'm kidding, I mean it really soared, and I know because all the signs are there: major raise in body hair density, healthy skin, healthier hair, better muscle recovery and consistent lean muscle mass gains - amongst many others. Calcium Egg yolks are rich in the mineral calcium. Calcium is an important nutrient, often found in dairy products, that can help maintain the strength of your bones and teeth. Additionally, a study published in the December 2008 issue of "Biological and Trace Element Research" explains that calcium may help increase testosterone levels. Vitamin D Egg yolks are a rich source of vitamin D. This vitamin helps promote proper immune function and regulates calcium levels. Additionally, research from the March 2011 issue of "Hormone and Metabolic Research" indicates that increased vitamin D intake can produce higher testosterone levels. Aspartic Acid Because egg yolks are high in protein, they are also rich in amino acids, which are the building blocks of protein. Eggs are particularly rich in aspartic acid, an amino acid which research from the October 2009 edition of "Reproductive Biology and Endocrinology" found could significantly increase testosterone levels in just 12 days. References USDA National Nutrient Database: Egg, Yolk, Raw, Fresh "The American Journal of Clinical Nutrition"; Effects of Dietary Fat and Fiber on Plasma and Urine Androgens and Estrogens in Men: A Controlled Feeding Study; J.F. Dorgan

I can back up what Skb has written above. I have spoken to my biochem professor about this and he cleared it up for me. I would also like to add that if you look at the amino acid profile found in egg whites it's one of the best, if not best, amino acid profile you can find. Texas A&M recently also published a study that showed subjects who ate 3 whole eggs a day built twice as much muscle over a 12-week period than those who only ate 1 whole egg. Eggs are your friends! As science improves we are debunking a lot of old nutrition myths from the past, but since nothing is 100% concrete I wouldn't eat extreme portions of anything.

Eggs are awesome, but I just wanted to point out that you got your "good" and "bad" cholesterol backwards. HDL is good and LDL is the bad cholesterol. Not trying to be a smart *** just didn't want anyone confused.

Oh s##t, my bad. I knew that, not sure why the mix-up. Sorry, must've been a brain-****.