Testosterone and Men

Testosterone levels are often a problem for men with thyroid problems. This is no real surprise as all systems of the body are impacted when thyroid hormones are low or are not working effectively.

I will assume in this blog post that all the basics of low iron, other nutrients, and low cortisol and blood sugar issues have been addressed and are not relevant.

There are many connections that men should be aware of.

Low thyroid hormone often results in low testosterone levels.

Low testosterone in men will result in a lowering of D1 activity (one of the deiodinases involved in conversion of FT4 to FT3).

Low thyroid hormone levels may lead to lower growth hormone levels and this in turn may reduce FT4 to FT3 conversion and increase reverse T3 (growth hormone supplementation is known to increase FT4 to FT3 conversion and reduce reverse T3). 

Note: when looking at testosterone levels it is important to test: Total Testosterone, SHBG and ideally Free Testosterone. In some cases where aromatisation is a concern then Estradiol should be checked also. 

Here is a good link to begin your own research with: http://nahypothyroidism.org/deiodinases/

For a man with low cortisol not caused by Addison's disease or hypopituitarism, the CT3M can be a real blessing. CT3M can often raise testosterone levels in men. Male thyroid patients have often seen 30% increases in total testosterone levels when using CT3M. I know my own levels came up from very low end of the reference range to mid-high end of the reference range with CT3M.

Whether you can use the CT3M depends on whether you have low cortisol or not. If you don't then CT3M won't help you, and in fact could cause issues by raising cortisol to too high a level. But for those men that need to address low cortisol, CT3M may work well to raise testosterone levels also.

Let's briefly discuss sex hormone binding globulin (SHBG). In both men and women SHBG is the protein that carries the sex hormones testosterone and oestrogen. Only the testosterone and oestrogen that is not bound to SHBG (and some albumin but I'm not going into that in this post) is biologically active. If testosterone levels stay the same and SHBG rises, there is less biologically active testosterone and a guy can feel less than himself. So, when a man (or a woman) has testosterone checked then they should also have SHBG checked at the same time.

For a thyroid patient on natural desiccated thyroid there is rarely an issue with SHBG. However, for those thyroid patients who have to use T3 replacement, this sometimes this may drive SHBG up. Multi-dosing using the dosage management process in the 'Recovering with T3' book helps because the process is best in class at arriving at an effective T3 dosage with low individual T3 doses and low total levels of T3.

If SHBG is still an issue then there are multiple approaches. Some patients have said that the use of milk thistle can sometimes bring SHBG down. Stinging nettle root extract (it has to be the root) in capsules can really help to lower SHBG. Stinging nettle root comes in 250 mg and 500 mg capsules and the dosing typically is done 2-3 times per day over the day. There is also a drug called Danazol that can be used in low dose as an off-label approach to reducing Danazol (100 mg every other day is typical). Danazol supposedly cuts SHBG in half within 6-8 weeks. Note: Danazol is a prescription drug and its use to reduce SHBG is an 'off label' application. Danazol should only be considered under the supervision of a knowledgeable physician. Some doctors prefer to provide transdermal or injected testosterone to a high enough level to overcome any SHBG, as testosterone will ultimately suppress SHBG, although this can lead to other problems e.g. higher estrogen levels (aromatisation). If SHBG is an issue then it should be discussed with a competent doctor or specialist that is knowledgeable in this area.

I hope this was useful.

Best wishes,


(Updated in February 2019)