What to watch with SHBG and gut health?

SHBG (sex hormone-binding globulin) is often discussed in the context of hormonal health, but its link to gut health is indirect and not strongly established. SHBG is produced in the liver and regulated by insulin, thyroid hormones, and estrogens. A disrupted gut microbiome can influence SHBG through inflammation, insulin resistance, and altered estrogen metabolism (estrobolome). Low SHBG is associated with metabolic syndrome, type 2 diabetes, and fatty liver—conditions also linked to gut dysbiosis. However, SHBG is not a direct marker of gut health. Consumer DNA tests that analyze SHBG-related variants typically have small effect sizes and lack clinical validation. The evidence is mostly observational and mechanistic. To support both SHBG and gut health, focus on a fiber-rich diet, regular exercise, stress management, and maintaining a healthy weight. Medical SHBG testing is only warranted if you have specific symptoms like low libido, menstrual irregularities, or unexplained fatigue. Be cautious of supplements claiming to directly boost SHBG—evidence is weak.