Testosterone Status and Thyroid Health: Context from a Published Case Report

His professionally guided plan included dietary changes, gut-focused strategies, and nutritional supplements, including a geranylgeraniol supplement. Geranylgeraniol (GG) is a compound the body uses in processes involved in normal hormone production.*

Hormones help coordinate many important functions throughout the body. Thyroid hormones help regulate metabolism, including how the body uses energy. Testosterone plays roles in muscle health, sexual function, and other aspects of men’s health. Although these hormones have different functions, several biological processes can influence both thyroid and testosterone health.

One of these processes involves the immune system. Ongoing immune activity can affect more than one system in the body. It can increase the release of inflammatory proteins called cytokines, which may disrupt hormonal signals and other processes involved in testosterone production. Gut health may also influence immune activity, adding another potential connection among the gut, thyroid, and hormone health. These overlapping pathways help explain why thyroid and testosterone health may be considered as parts of a broader hormone and immune picture.

In the published case, these connections provided broader context as thyroid health remained an area of focus and testosterone status emerged as another concern. The practitioner later added a GG supplement to the patient’s nutrition plan.

Understanding GG’s role in the body helps explain why it was of interest in this case. GG is a naturally occurring compound that the body makes and that is also found in small amounts in certain foods. An annatto-derived GG supplement provides a concentrated source of GG obtained from the seeds of the annatto plant. GG also plays a role in the mevalonate pathway, a series of reactions the body uses to make cholesterol and other important compounds.*

The mevalonate pathway is relevant to hormone production because the body uses cholesterol as a starting material to make steroid hormones, including testosterone. Because GG participates in this pathway, researchers have studied its role in processes related to normal steroid hormone production and hormone pathway support.* In this case, GG supplementation became part of the patient’s broader nutrition plan as his practitioner monitored testosterone status alongside his ongoing thyroid health.

The published report describes one 27-year-old man’s experience with a professionally guided nutrition plan that developed over nearly two years. In early 2023, the plan began with dietary changes and supplemental support. A few months later, the practitioner used gastrointestinal testing to learn more about digestive function and the gut environment. Based on these findings, the plan expanded to include removing gluten and dairy, introducing digestive enzymes, and eating more fiber and foods rich in plant compounds.

By late 2023 and into 2024, testosterone status had become another area of focus. In September 2024, the practitioner added a trans-geranylgeraniol supplement. The patient used it for approximately nine weeks, with follow-up laboratory testing in November 2024. Because the patient used dietary, nutritional, and gut-focused strategies as part of a broader plan, the case cannot determine the contribution of any individual component.

The report is a narrative account of one person’s professionally guided experience. It cannot show cause and effect, cannot tell us whether another person would have the same experience, and should not be used as a supplementation plan.