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If you have elevated SHBG, talk to your doctor of course. But here are some additional ideas to help you lower your levels naturally. Again, remember that overly elevated levels will rob you of free testosterone potentially:
1. Correct Any Medical Issues. Step #1 should be to correct any medical issue - see the above - that has lead to excessively high SHBG. Getting to the root cause is always a good idea!
2. Protein. Animals studies have shown that increasing protein intake can lower SHBG. 
3. Fish Oil. Omega-3's can help with inflammation, depression, mood and cardiovascular outcomes according to some experts, so why not with free testosterone as well? (CAUTION: There is a recent study showing fish oil increases prostate cancer risk though.)
4. Vitamin D. According to one large study on men, the higher the Vitamin D, the higher the testosterone. And the good news does not stop there: the higher the Vitamin D, the lower the SHBG according to this same study. 
5. Dietary Fat. One (small) study on six men found that if the men ate a higher fat diet, > 100 grams fat/day, their SHBG dropped. This may seem like a good thing, but remember that high fat diets are used by researchers to induce insulin resistance.  A smiliar study echoed the same result and suggested that fiber may play a role as well.  See my link on Fat and Fiber for some additional information.
6. Stinging Nettle. Stinging Nettle is a proven SHBG lowerer and it does so by affecting the liver. I cover this in much more detail in my link on Free Testosterone.
7. HRT (Testosterone Therapy). I consider HRT to be a natural treatment option, assuming that testosterone is kept within physiological ranges. And exogenous testosterone will generally lower SHBG (along with many other benefits).
8. DHEA. DHEA can lower SHBG as shown in a couple of studies.  Anecdotally, one of our forum posters heard from his doctor that low DHEA can lead to elevated SHBG.  Interestingly, this doctor did not recommend supplemental DHEA but rather to lower stress. However, some of the adrenal fatigue docs treat their patients with this hormone when one is deficient. That said, DHEA supplementation is tricky and some of it will always convert to estradiol. It is somewhat of a crapshoot knowning whether the DHEA will turn properly into testosterone or estradiol. DHEA can also lower cortisol, which is not always desireable in every case. Adding to the confusion is the fact that some practitioners give 10 mg to their male patients when needed and still others 50 mg. So dosage can be vague and controversial.
CAUTION: If you have a medical condition or are on any medications, please discuss any changes with your doctor first. Certain supplements, foods and even juices can alter absorption rates of certain medications for example. Play it safe.
2) The Journal of Steroid Biochemistry and Molecular Biology, Jun 1995, 53(1-6): "Interrelations between sex hormone-binding globulin (SHBG), plasma lipoproteins and cardiovascular risk"
3) The Journal of Clinical Endocrinology & Metabolism, Jul 1 1996, 81(7):2515-2519, "Acute and chronic regulation of serum sex hormone-binding globulin levels by plasma insulin concentrations in male noninsulin-dependent diabetes mellitus patients"
4) Diabetes Care, May 2004, 27(5):1036-1041, "Testosterone and Sex Hormone–Binding Globulin Predict the Metabolic Syndrome and Diabetes in Middle-Aged Men"
5) Bone Miner Res, 2008 Oct, 23(10):1552-60, "Older men with low serum estradiol and high serum SHBG have an increased risk of fractures"
6) The Journal of Clinical Endocrinology & Metabolism, Dec 1 2006, 91(12):4764-4766, "Sex Hormone Binding Globulin: Inhibitor or Facilitator (or Both) of Sex Steroid Action?"
7) Journal of Bone and Mineral Research, October 2008, 23(10:1552–1560, "Older Men With Low Serum Estradiol and High Serum SHBG Have an Increased Risk of Fractures"
8) Clinical Endocrinology, Sep 1995, 43(3):331–337, "Hypothalamic-pituitary-testicular function in end-stage non-alcoholic liver disease before and after liver transplantation"
9) The Journal of Clinical Endocrinology & Metabolism, May 1 1987, 64(5):1083-1085, "DIETARY LIPIDS : AN ADDITIONAL REGULATOR OF PLASMA LEVELS OF SEX HORMONE BINDING GLOBULIN"
10) Am J Clin Nutr, Dec 1996 64(6):850-855, "Effects of dietary fat and fiber on plasma and urine androgens and estrogens in men: a controlled feeding study"
11) Clin Endocrinol (Oxf), 2009 Dec 29, [Epub ahead of print], "Association of vitamin D status with serum androgen levels in men"
12) Cancer, 15 August 1988, 62(4):760–762, "Sex hormone imbalance in male alcoholic cirrhotic patients with and without hepatocellular carcinoma"
13) J Clin Endocrinol Metab, 2000 Jan, 85(1):293-6, "Diet and sex hormone-binding globulin"
14) Int J Androl, 1981 Dec, 4(6):639-45, "The effect of clomiphene citrate on sex hormone binding globulin in normospermic and oligozoospermic men"
15) Clinical Endocrinology, Oct 1998, 49(4):421–432, "The effect of six months treatment with a 100 mg daily dose of dehydroepiandrosterone (DHEA) on circulating sex steroids, body composition and muscle strength in age-advanced men and women"
16) Clin Endocrinol (Oxf), 1992 Feb, 36(2):187-92, "Serum levels of free and bound testosterone in hyperthyroidism."
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