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Testosterone therapy in transgender men has both desired effects like increased muscle mass and potential health risks such as higher cardiovascular risk.

High testosterone levels in 20% of the women studied may indicate PCOS, while 80% had low levels with potential health impacts.

Barn owls with smaller black spots have higher testosterone levels, which might be due to genetic effects on hormone regulation rather than hormone effects on coloration.

Blocking testosterone action may improve breathing during NREM sleep in healthy men.

Hair samples can reliably show average long-term hormone levels in young women.

Pattern baldness is likely caused by a dominant gene influenced by testosterone levels, making it more common in men.

Higher testosterone levels can increase the risk of certain diseases like type 2 diabetes in women and prostate cancer in men, but can also protect against autoimmune diseases and hair loss. It also affects body fat and bone density.

Men with male-pattern baldness have higher levels of certain testosterone metabolites and may have more active androgen metabolism.

Caucasian men have more chest hair and higher levels of certain androgen products than Chinese men.

Blood hormone levels don't accurately show brain hormone levels in males.

A 5 mg dose of transdermal testosterone cream effectively restores testosterone levels in postmenopausal women.

Testosterone therapy for transmasculine individuals is generally safe with medical supervision, improves mental health, and has mixed effects on physical health.

A transman experienced lasting virilization symptoms after stopping testosterone, which were resolved with estradiol treatment.

Testosterone therapy can modestly improve sexual function in menopausal women but should be used cautiously and is not recommended for routine measurement in sexual dysfunction or hirsutism.

Cosmetic hair treatments can increase hair testosterone levels, while natural hair color does not affect it.

Higher dihydrotestosterone may be linked to more inflammation in COVID-19 patients with low testosterone.

Testosterone treatment in trans men increases body and facial hair and may lead to hair loss over time, but severe skin issues are rare.

Long-term testosterone therapy can cause hormone suppression, affect prostate and heart health, and alter physical characteristics, but does not increase prostate cancer risk and needs more research for full risk assessment.

Oral testosterone therapy raises heart risk more than other methods.

Bright light during the day doesn't change most human clock genes but may slightly increase Rev-erb-ß.

Testosterone works in different ways, including direct interaction with its receptor, conversion to other hormones for specific effects on genitalia, hair, bones, and muscle, and changes in body fat and sexual function when low.

Male C57BL/6 mice show age-related fluctuations in certain hormones and their ratios in both blood and hair.

Certain finger length ratios and body hair patterns may predict side effects from birth control pills in women.

The new testosterone patch works as well as the gel.

Baldness in men with prostate cancer is linked to higher levels of certain sex hormones, but chest hair density is not.

Low testosterone levels may lead to more severe COVID-19 outcomes.

Australian doctors experienced in adult transgender healthcare mostly prescribe intramuscular testosterone and oral estradiol, recommend mental health assessments before hormone therapy, and support improved training and guidelines.

More research is needed to understand how testosterone is maintained in adult males.