Testosterone

Testosterone is a steroid hormone from the androgen group. In mammals, testosterone is primarily secreted in the testes of males and the ovaries of females, although small amounts are also secreted by the adrenal glands

Testosterone Physiological Effects

Testosterone is the principle male sex hormone and is responsible for reproductive growth and development in male vertebrates.

Testosterone Replacement Therapy for Men: Risks and Benefits

Testosterone Biochemistry

What is Testosterone?

Testosterone Mechanism

Testosterone Treatments

Latest Testosterone News and Research

Testosterone shows no evidence of improving menopausal brain fog

Published in Reproduction and Fertility, the review examined five existing studies of women aged 41 to 65 to understand whether testosterone treatment improves thinking and memory in women during and after menopause.

30 Oct 2026

$3.7 million grant awarded to assess the impact of testosterone on binge eating

A team of clinical scientists from the Michigan State University Department of Psychology and Texas A&M University’s Department of Psychiatry and Behavioral Sciences has been awarded a $3.7 million grant from the National Institute of Mental Health to assess the impact of testosterone on binge eating risk in women.

29 Oct 2026

Plant and animal proteins show opposite effects on testosterone levels

Higher animal protein intake was associated with lower blood testosterone levels, while higher plant protein intake was associated with higher levels, according to a new study from the University of Eastern Finland.

28 Oct 2026

Men with lower testosterone at 31 reported good health 15 years later

Researchers analyzed testosterone concentrations measured at age 31 in 2,691 Finnish men and assessed self-reported health, medical conditions, and quality of life at age 46. Men across testosterone quartiles generally reported good health and excellent quality of life, while differences in metabolic and gastrointestinal conditions lost statistical significance after adjustment for waist circumference.

27 Oct 2026

Abiraterone triplet therapy improves long-term survival in metastatic prostate cancer

Adding abiraterone to standard treatment provides a lasting survival benefit for men whose prostate cancer has already spread at diagnosis, reinforcing the value of early treatment intensification.

24 Oct 2026

Like father, like son? Study reveals a surprising pattern in male reproductive health

Researchers examining 117 father-son pairs from Denmark and Finland identified weak but statistically significant familial associations in several male reproductive traits, including testicular size, sperm concentration, selected hormone levels, and genital measurements. The findings suggest that reproductive characteristics show limited resemblance across generations, although the study could not determine the relative contributions of genetic and environmental factors.

21 Oct 2026

Rapid growth in private testosterone prescribing raises safety concerns

The rapid expansion of private testosterone prescribing risks extending treatment beyond men with clearly defined need to people with non-specific symptoms and borderline test results, for whom the balance of benefit and long term risk are less certain, warn experts in The BMJ today.

14 Oct 2026

Sex hormones dictate how skin stem cells renew themselves

For a long time, differences between females and males were mainly associated with the reproductive organs. Yet organs that have nothing to do with reproduction, such as the skin, can also be shaped by sex.

14 Oct 2026

Sex chromosomes influence immunity, cancer, aging and disease risk

A new review published in Science brings together growing evidence that the X and Y chromosomes do much more than determining biological sex. They also shape how cells function, age and respond to disease.

1 Oct 2026

Menopause leaves a blood protein signature linked to brain aging and Alzheimer’s risk

Researchers identified a 16-protein blood signature associated with menopause that tracked more strongly with reproductive hormones than chronological age and was largely replicated in an independent UK Biobank cohort. Higher menopause proteomic scores were also associated with less favorable proteomic aging estimates and poorer cognitive outcomes in older women, including incident Alzheimer’s dementia, although the observational evidence does not establish causality.

23 Sep 2026

Polystyrene nanoplastics may threaten reproductive health and offspring development

Plastic pollution is increasingly being recognized as more than an environmental problem. Tiny plastic particles can enter living organisms, circulate through biological systems, and potentially reach reproductive tissues.

21 Sep 2026

Daughters inspire closer parental relationship bonds, study finds

Children can be hard on a relationship, but some kids can bring parents closer together.

21 Sep 2026

Male contraception has barely changed in a century. What comes next?

A review traces more than 5,000 years of male contraception, from early penile sheaths and the development of modern condoms and vasectomy to today's search for reversible alternatives. Researchers are now testing hormonal gels, non-hormonal compounds and vas-occlusive technologies, although these approaches remain at different stages of preclinical and clinical development.

15 Sep 2026

New genetic map helps track aggressive prostate cancer development

Prostate cancer is the second most common form of cancer among men globally. Yet, we still know relatively little about why the disease develops or why some men live with it for years while in others it progresses aggressively.

9 Sep 2026

Workplace stress may impair erectile function in young men

New research in the International Journal of Clinical Practice suggests that workplace psychological stress may impair erectile function in young men by affecting certain stress management pathways in the brain and reducing testosterone levels.

9 Sep 2026

Could one amino acid help explain why men tend to live shorter lives?

A UK Biobank cohort and Mendelian randomization study involving 272,475 participants linked higher circulating tyrosine with greater all-cause mortality and genetically predicted higher tyrosine with shorter lifespan. After accounting for phenylalanine, the relationship with shorter lifespan was clearest in men, while findings in women were less consistent, suggesting a potential sex-specific role for tyrosine in longevity.

7 Sep 2026

New study uncovers bacterial route to testosterone production

Many prostate cancers depend on androgen hormones, including testosterone, to grow. That is why treatments for advanced disease often try to reduce testosterone production or block its effects.

4 Sep 2026

Study links popular weight-loss drugs to increased male hair loss

Men already at risk genetically for the most common form of hair loss have a 7 percent added risk of losing their hair if they use drugs like Ozempic, Wegovy, and Zepbound for type 2 diabetes and obesity, a new study shows.

3 Sep 2026

Too little or too much testosterone may matter for heart rhythm

A review of clinical trials, observational studies, genetic analyses, and mechanistic research suggests that atrial fibrillation risk may follow a U-shaped relationship with testosterone, increasing at both low and high levels. Evidence on testosterone replacement therapy remains mixed, with researchers calling for prospective studies to determine whether mid-physiological testosterone targets and treatment formulation influence AF risk.

2 Sep 2026

Study links finasteride to fewer complications after heart attack in men

Patients treated with medication for benign prostatic hyperplasia at the time of a severe acute heart attack experienced fewer serious complications from the attack, according to a study from the University of Gothenburg.

26 Aug 2026