Myths vs facts: SHBG and skin aging

SHBG (sex hormone-binding globulin) is a carrier protein for sex hormones like testosterone and estradiol. Low SHBG increases free, bioactive hormones, which could theoretically influence skin aging: free androgens may reduce collagen synthesis, while free estrogens may support it. However, direct human evidence linking SHBG levels to skin aging is weak. Most studies show associations but not causation. SHBG is also heavily influenced by insulin resistance, liver function, thyroid status, diet, and exercise. A single SHBG measurement from a home test is therefore a poor predictor of actual skin aging. UV exposure, smoking, and sleep quality are far more impactful. Consumer DNA or blood tests that claim to predict skin aging via SHBG often overstate the evidence. MyBody-X tests may include SHBG, but the link to skin aging remains speculative. For better skin health, focus on proven lifestyle measures rather than isolated biomarkers.