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3) Medications and Alcohol. Many medications can effect SHBG. Remember that SHBG is made in the liver and most medications effect the liver. Common drugs that often raise SHBG are sedatives, antihypertensiaves, tranquilizers as well as your old friends beer and booze.
4) Stinging Nettle. Another way to lower SHBG is through an herb called Stinging Nettle. Stringing Nettle is widely prescribed in Europe for BPH ( Benign Prostate Hypertrophy). Several studies have documented Stinging Nettle's SHBG-lowering powers  and, so far, Stinging Nettle has an excellent safety profile. However, its side effect profile is worth mentioning: Stinging Nettle also blocks the action of the enzyme that converts testosterone to DHT. Some would argue that this is good since DHT is associated with things like hair loss and prostate problems. However, sometimes, in sensitive individuals, side effects include erectile dysfuntion and a decreased amount of semen. Plus, DHT is a critical androgen for males and very important to libido and so Stinging Nettle is questionable in my opinion because of it. I should point out that there are no studies, as far as I know, that actually show Stinging Nettle increasing free testosterone: more research needs to be done.
5) Insulin Resistance. Insulin resistance will lower your SHBG  and, therefore, in the short term probably raise free testosterone. So let's all get insulin resistant and live happily ever after, right? Wrong! Insulin resistance is a death warrant. (Read this link on Metabolic Syndrome for more details.)
6) Sugar and Corn Syrup. These bad boys can lower SHBG. Unfortunately, these can lead to insulin resistance, inflammation, advanced glycation end products and many other nasty things. How does it do all this? Researchers have discovered that sugar will also lower SHBG, because it increases fat synthesis in the liver, which in turn shuts off the gene involved in SHBG synthesis. Bottom line: stay away from sugar and corn syrup even though in the short term they may raise your free testosterone.
7) Green Tea. Green Tea does actually raise SHBG.
8) Vitamin D. Vitamin D was found in a 2009 study of about 2,300 adult males to lower SHBG and increase both free and total testosterone. 
9) Boron (Sodium Tetraborate or Borax). One study showed that boron can not only increase free testosterone but lower estradiol as well. See my link on Boron and Testosterone for more details.
10) Protein-to-Carbohydrate Ratio. The protein/carbohydrate ratio has an interesting effect on free testosterone and SHBG. Several studies have shown that increasing carbs versus protein boosts total testosterone. However, before you start pounding granola bars, one study found that increasing the protein/carb ratio not only increased total testosterone but also SHBG.  This means that free testosterone may not have been increased significantly because of SHBG's opposing effects. (Increasing the protein to carbohydrate ratio also increased cortisol, a fact I cover elsewhere on this site.)
1) J Korean Diabetes Assoc, 1998 Sep,22(3):328-337
2) Planta Med, 1995 Feb, 61(1):31-32; Fortschr Med, Nov 10 1996, 114(31):407-411; Z Naturforsch [C], 1995 Jan-Feb,50(1-2):98-104
3) Clin Endocrinol (Oxf), 2009 Dec 29, [Epub ahead of print], "Association of vitamin D status with serum androgen levels in men"
4) Life Sciences, May 4 1987, 40(18)1761-1768, "Diet-hormone interactions: Protein/carbohydrate ratio alters reciprocally the plasma levels of testosterone and cortisol and their respective binding globulins in man"
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