Studies & research
Hormone science is large and evolving. This library distills major guidelines and research themes into plain language and links directly to the authoritative source — clinical practice guidelines, government health agencies, and the peer-reviewed literature indexed in PubMed — so you can go straight to the evidence.
Browse research summaries
Testosterone Therapy: What the Evidence Shows
A plain-language overview of what major guidelines and the broad body of research conclude about testosterone therapy, its benefits, risks, and open questions.
Menopausal Hormone Therapy: Evidence Overview
What major guidelines and research conclude about menopausal hormone therapy — its benefits, risks, timing, and the questions still being studied.
Thyroid Treatment: Evidence Overview
A plain-language summary of what major guidelines and research conclude about treating hypothyroidism and hyperthyroidism, plus open questions.
Vitamin D and Hormones: Evidence
What research and major guidelines conclude about vitamin D, its hormone-like role, testing, supplementation, and where evidence is still developing.
Hormones and Bone Health: Evidence
A plain-language overview of what research and major guidelines conclude about how hormones affect bone density, osteoporosis, and fracture risk.
PCOS Research: What We Know
A plain-language overview of what major guidelines and research conclude about PCOS — diagnosis, management, and the questions still being studied.
Cortisol and Stress: Research Overview
What the broad body of research and major guidelines conclude about cortisol, the stress response, testing, and the popular ideas that outrun the evidence.
How Reliable Are Hormone Tests?
A plain-language overview of what research and lab-medicine guidance conclude about hormone test reliability, sources of variability, and reading results.
Bioidentical Hormones: What the Evidence Shows
A plain-language overview of what major guidelines and evidence indicate about bioidentical hormones, including compounded products and testing claims.
DHEA Supplements: Evidence Overview
A plain-language overview of what major guidelines and the broad body of evidence indicate about DHEA supplements, the conditions involved, and testing.
Growth Hormone and Aging: Evidence
A plain-language overview of what major guidelines and the broad body of evidence indicate about growth hormone, aging, and anti-aging supplement claims.
Thyroid Antibodies: Research Overview
A plain-language overview of what the broad body of evidence and major guidelines indicate about thyroid antibodies, what they mean, and how testing is used.
Testosterone and Heart Health: Evidence
A plain-language overview of what major guidelines and the broad body of research generally indicate about testosterone, its therapy, and heart health.
Metformin and PCOS: Evidence Overview
A plain-language overview of what major guidelines and the broad body of research generally indicate about metformin in PCOS and its limits.
Thyroid Screening: What the Evidence Shows
A plain-language overview of what major guidelines and the broad body of research generally indicate about thyroid screening, who it helps, and ongoing debate.
Vitamin D Supplementation: Evidence
What guidelines and the broad body of research indicate about vitamin D supplementation, who may benefit, and where the evidence is still developing.
Lifestyle and Testosterone: Evidence
What the broad body of research indicates about how sleep, weight, exercise, and lifestyle relate to testosterone, and where the evidence is developing.
The HRT 'Timing Hypothesis': Evidence
The hormone therapy timing hypothesis explained — what guidelines and the broad body of research suggest about when therapy starts and why it matters.
Subclinical Hypothyroidism: Evidence
What guidelines and the broad body of research indicate about subclinical hypothyroidism, when treatment is considered, and the open questions that remain.
Type 2 Diabetes Prevention: Evidence
What guidelines and the broad body of research indicate about preventing or delaying type 2 diabetes, and where the evidence is still developing.
Adrenal Fatigue: Examining the Evidence
A neutral look at why "adrenal fatigue" is not an established medical diagnosis, what the evidence shows, and how it differs from adrenal insufficiency.
Sources
- PubMed (U.S. National Library of Medicine). https://pubmed.ncbi.nlm.nih.gov/
- Endocrine Society. Clinical Practice Guidelines. https://www.endocrine.org/clinical-practice-guidelines
- Cochrane. https://www.cochrane.org/