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2. Quercetin. Quercetin is the powerful antioxidant flavonoid in onions, red grapes, tea and many other fruits and vegetables. It has powerful anti-cancer properties and has been the subject of extensive research. One of its lesser known superpowers (in rats at least) is increasing testosterone. Scientists found, for example, that giving 50 mg per kg of body weight gave an almost 80% in testosterone. 
Of course, the problem with this is that for the typical 160 pound male, you are talking about a megadose of over 3 grams of quercetin in us humans. Nevertheless, it shows the power of some antioxidants to power up testosterone production in the ol' Leydig cells. NOTE: I'm not a researcher and so don't ask me if its a one-to-one ratio from rat to man either.
3. Onion Juice. Based on #2, it probably will be no surprise that onions, if consumed in large enough quantities, can boost testosterone. Of course, the question of the day becomes "how in the world do I eat an onion or two and still live in polite society"? Researchers came up with a nice solution: onion juice. They just blended one standard onion and - shazam! - the juice boosted rat testosterone by 300+%. 
The only problem is that the amount of onion juice these rats consumed was 1 gram per kilogram, which translates to about 73 grams of onion juice for the typical 72 kg guy. However, it should be noted that even taking half that amount of onion juice created a nice testosterone boost as well, so it is likely dose dependent, i.e. even a smaller amount of onion juice may give you a little lift. NOTE: Again, I'm not a researcher and so don't ask me if its a one-to-one ratio from rat to man.
4. Melatonin. Data is very limited but the antioxidant and hormone melatonin appears to protect testosterone in Leydig cells as well. 
So should you start gulping gallons of juice? Well, that's a little premature for a variety of reasons. First of all, all of the above studies are on animals and may not translate to humanoids such as ourselves. Furthermore, perhaps it's possible to overdo antioxidant consumption. For example, some experts have posited that if you overdo ingestion of antioxidants, it shuts down the body's own natural antioxidant production.
However, a solid diet loaded loaded with ample antioxidants will likely protect and possibly boost your testosterone and give you multiple additional health benefits as well.
1) Experimental Gerontology, Aug-Sep 2005, 40(8-9):728-736, "Vitamin E, aging and Leydig cell steroidogenesis"
2) The Journal of Steroid Biochemistry and Molecular Biology, Jan 2004, 88(1):61-67, "Aging alters the functional expression of enzymatic and non-enzymatic anti-oxidant defense systems in testicular rat Leydig cells"
4) Endocrinology, 2002, 144(7):2882-2891, "Reactive Oxygen Disrupts Mitochondria in MA-10 Tumor Leydig Cells and Inhibits Steroidogenic Acute Regulatory (StAR) Protein and Steroidogenesis"
6) J Endocrinol, 2004 Jun, 181(3):493-507, "Reduction of rat prostate weight by combined quercetin-finasteride treatment is associated with cell cycle deregulation"
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