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In this study, researchers observed that in barn owls, the relationship between black feather spot size and testosterone levels varied by age and sex, suggesting involvement of genes regulating both traits rather than direct influence of testosterone on feather coloration.

This study found that low serum testosterone and elevated serum oestrone in men with cirrhosis are associated with worse liver disease and adverse health outcomes, suggesting oestrone as a potential ill health marker.

Women have a higher DHT/testosterone ratio than men, possibly due to gut bacteria activity.

In this review and meta-analysis, the authors concluded that 5α-reductase inhibitor therapy is not consistently associated with significant increases in serum testosterone levels in men.

In this study, engineered mice with a mutation similar to that in Olmsted syndrome showed progressive hair loss due to impaired inner root sheath keratinocyte differentiation and stem cell exhaustion.

This study found that among older men, lower calculated free testosterone was significantly associated with a higher risk of heart failure, suggesting a possible role of testosterone deficiency in heart failure incidence.

This study found that male pattern baldness may serve as a clinical marker for circulating sex hormone levels in men with localized prostate cancer, while chest hair density showed no significant hormone association.

This review found that circulating dihydrotestosterone (DHT) consistently distinguishes men with androgenetic alopecia from controls, suggesting a key role in the condition's biology and potential therapeutic targeting.

This study reports that oophorectomy significantly reduces serum testosterone levels in postmenopausal women, indicating the postmenopausal ovary's continued production of testosterone.

This study found that prepubertal girls have significantly higher levels of estrogens and androgen metabolites compared to age-matched boys, which may contribute to their earlier onset of puberty.

This review discusses how sex hormone levels and local steroid synthesis influence gender differences in aging skin, reporting no new clinical results.

In this study, PCOS patients had lower Spexin levels, which were inversely associated with adverse metabolic and hormonal profiles, suggesting a role for Spexin in PCOS pathways.

This study suggests that long-term use of hair dyes may be associated with higher testosterone levels among premenopausal Japanese women.

This study found that three months of oral finasteride treatment significantly decreased dihydrotestosterone levels and hair growth in hirsute women without negatively affecting gonadotropin secretion.

This study suggests that hepatocellular carcinoma in cirrhotic men is associated with altered sex-steroid metabolism, indicated by lower testosterone and 5 alpha-dihydrotestosterone levels compared to cirrhosis alone.

This study found that finasteride significantly suppresses serum dihydrotestosterone levels at all tested doses in normal male volunteers without significant adverse effects.

The April 2014 issue of "Fertility and Sterility" discussed various reproductive health topics, including hormone therapy benefits, sperm and genetic factors in male infertility, and the link between PCOS and diabetes.

This study found that women experiencing diffuse hair loss had significantly lower levels of plasma sex-hormone binding globulin compared to controls, while their testosterone levels remained normal.

This study concludes that high skin 5α-reductase activity may contribute to hirsutism, but the specific regulatory mechanisms and genetic factors remain unclear.

This study found that three genetic loci, including the newly identified JMJD1C, are associated with circulating testosterone and dihydrotestosterone levels, explaining a small portion of their variance in European men.

This study reviews the potential of rosemary for hair loss treatment, highlighting its beneficial bioactive compounds that may support healthier scalps and promote hair growth, though inconsistencies in formulations and lack of long-term safety data suggest more research is needed.

This article reviews the benefits of Truman Plus Male Enhancement for testosterone levels and sexual health, but it does not present any new clinical study results.

This review presents studies on plants used in Mexico to treat alopecia and reports no new clinical results.

This study developed a microneedle system using black phosphorus nanosheets and baicalin for treating androgenetic alopecia, finding it effectively enhanced drug penetration and follicular targeting while showing synergistic efficacy and safety in preclinical tests, including in vivo model efficacy against testosterone-induced hair loss.

This study observed that circulating testosterone affects baseline sex differences in voiding function in C57BL/6J mice, with prostate lobe mass having a lesser impact.

This study found no association between circulating androgens and prostate cancer risk, underscoring the complex role of androgen metabolism in the prostate.

This study defined menstrual phase-specific reference intervals for circulating androgen levels in young women, highlighting that anovulatory females showed higher androgen, LH, and FSH levels compared to ovulatory females.

This study indicates that the normal human prostate is not a major contributor to circulating blood DHT concentrations in androgen-deficient patients receiving testosterone replacement therapy.

This review describes two cases of young women with primary amenorrhea and hyperandrogenemia, suggesting that adrenal tumors should be considered in patients with significantly elevated circulating testosterone levels.

In this study, correlations between urinary and serum androgen metabolites were examined in girls aged 6-13, revealing that summed urinary metabolites strongly correspond with circulating androstenedione and testosterone levels, though individual variations depend on participant characteristics such as age and body measurements.