testosterone. Genetics will only determine what your levels are supposed to be and how much beard you could grow as a result.
If you want to get more of it through diet, include raw adrenal glands and testicles.
Much more important than adding it is avoiding things that will lower it. That means avoiding all xenoestrogens, i.e. phytoestrogens and synthetic endocrine disrupting compounds.
So for synthetic estrogens, avoid all liquids stored in plastics, wet foods stored in direct contact with plastic wrap, composite plastic tooth fillings, medical drips from plastic pouch and tubing, swimming pools with chemical oxidizers (chlorine, ozone) that are lined with vinyl or have flexible pvc piping in the pump system, touching shiny magazine pages and shiny receipts with your bare hands, the shit is pretty much everywhere, good luck avoiding it all without everyone thinking you are nuts. If you can get lab-grade polyethylene or silicone these are the safest polymers, even polypropylene is pretty good but the commercial grade plastics are always combined to some extent with plasticizers or conditioners that will leach and bind to estrogen receptors in the body.
For phytoestrogens, try to stay away from plant foods that come from female plant parts, which means stick to leaves, stems, and roots over beans, fruits, grains, seeds, nuts, or vegetables with seeds or that are supposed to have seeds. Also smoking female flowers (pot) will give you large amounts of the phytoestrogens as well. Soy is like the king (or queen) of phytoestrogens so be sure to avoid anything having to do with soy if keeping testosterone up is your goal.
There are also certain lifestyle changes that will keep your levels up. I read a study that showed that testosterone levels dropped significantly after a climax and did not return to baseline for at least a week.
