The Claim
In Chinese men aged 40–69, serum sex hormone-binding globulin (SHBG) levels increase with age and are consistently associated with declining calculated free testosterone.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
In Chinese men between 40 and 69 years old, higher levels of sex hormone-binding globulin in the blood are linked to lower levels of free testosterone.
See the scientific wording
Serum sex hormone-binding globulin (SHBG) levels increase with age in Chinese men aged 40–69, and this rise is consistently associated with declining calculated free testosterone, suggesting SHBG may be a key modulator of bioavailable testosterone in aging.
As men age, the liver produces more of a protein that binds tightly to testosterone, leaving less of it free to enter cells and act on tissues.
What the research says
1 studyAs Chinese men get older, their bodies make more of a protein that traps testosterone, so less of it is free to work in the body — and this leads to more men having low active testosterone levels as they age.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.