Research & sources.
Every claim in the library traces back to a source below. We link to the original so you can read it yourself rather than take our summary on faith — the standard we hold every article to before it publishes.
- ABMS Certification Matters — verify a physician's board certification
Cited in: Finding a TRT-Literate Physician: What to Actually Look For
- Abu-Nejim & Becker, "Current Perspectives on GLP-1 Agonists in Contemporary Clinical Practice," Curr Atheroscler Rep (2025) — PMC
Cited in: Peptide Classes Explained: How Researchers Group Peptides by Mechanism, Peptides: A Research Overview for Hormone and Recovery Optimization
- ACOG — Management of Menopausal Symptoms (Practice Bulletin No. 141)
Cited in: Hormone Replacement Therapy: A Complete Guide for Men and Women
- Cleveland Clinic — Low Testosterone (Low T): Hypogonadism
Cited in: Testosterone Replacement Therapy: A Complete Educational Guide
- Cleveland Clinic — Testosterone Test
Cited in: How TRT Works: Diagnosis, Physiology, and Monitoring, Protocol Literacy Basics: Understanding Structure Without the Numbers
- Critical Role of Estrogens on Bone Homeostasis in Both Male and Female (PMC)
Cited in: Estrogen Management on TRT: What the Research Actually Shows
- Crosnoe et al., Exogenous testosterone: a preventable cause of male infertility, Translational Andrology and Urology
Cited in: How TRT Works: Diagnosis, Physiology, and Monitoring, TRT Myths vs. the Research: What the Evidence Actually Shows
- Cross-sectional and longitudinal determinants of serum SHBG in a cohort of community-dwelling men (PMC)
Cited in: SHBG (Sex Hormone Binding Globulin): How to Read It
- Endocrine Society Clinical Practice Guideline — Testosterone Therapy in Men With Hypogonadism
Cited in: Hormone Replacement Therapy: A Complete Guide for Men and Women, How to Read a Hormone Panel: A General Guide
- Evaluation and Management of Testosterone Deficiency (AUA Guideline)
Cited in: Finding a TRT-Literate Physician: What to Actually Look For, How TRT Works: Diagnosis, Physiology, and Monitoring, Protocol Literacy Basics: Understanding Structure Without the Numbers, Testosterone Replacement Therapy: A Complete Educational Guide, TRT Myths vs. the Research: What the Evidence Actually Shows
- FDA — Class-wide labeling changes for testosterone products
Cited in: Testosterone Replacement Therapy: A Complete Educational Guide, TRT Myths vs. the Research: What the Evidence Actually Shows
- FDA Warning Letter — PureRawz (September 2025)
Cited in: What "Research Use Only" Actually Means
- FDA Warning Letter — Summit Research Peptides (December 2024)
Cited in: Peptides: A Research Overview for Hormone and Recovery Optimization, What "Research Use Only" Actually Means
- FDA Warning Letter — Wholesale Peptide (June 2026)
Cited in: Peptides: A Research Overview for Hormone and Recovery Optimization, What "Research Use Only" Actually Means
- Health Law Alliance — "FDA Targets GLP-1 and Peptide Compounding, Advertising and 'Research Use Only' Labeling"
Cited in: What "Research Use Only" Actually Means
- Insulin-Like Growth Factor-1 (IGF-1) and Its Monitoring in Medical Diagnostic and in Sports (PMC)
Cited in: IGF-1: How to Read It
- Lincoff et al., Cardiovascular Safety of Testosterone-Replacement Therapy (TRAVERSE trial), NEJM
Cited in: Testosterone Replacement Therapy: A Complete Educational Guide, TRT Myths vs. the Research: What the Evidence Actually Shows
- Mayo Clinic — Testosterone therapy: Potential benefits and risks as you age
Cited in: Finding a TRT-Literate Physician: What to Actually Look For, Testosterone Replacement Therapy: A Complete Educational Guide
- Mayo Clinic Laboratories — Testosterone, Total and Free, Serum (Test Overview)
- MedlinePlus — Estrogen Levels Test
Cited in: Hormone Replacement Therapy: A Complete Guide for Men and Women, How to Read a Hormone Panel: A General Guide
- MedlinePlus — How to Understand Your Lab Results
- MedlinePlus — TSH (Thyroid-Stimulating Hormone) Test
- MedlinePlus Medical Encyclopedia: Estradiol
Cited in: Estradiol (E2): How to Read It
- MedlinePlus Medical Encyclopedia: Hematocrit
Cited in: Hematocrit: How to Read It
- MedlinePlus Medical Encyclopedia: Testosterone
Cited in: SHBG (Sex Hormone Binding Globulin): How to Read It, Total & Free Testosterone: How to Read It
- MedlinePlus: Testosterone Levels Test
- National Institute on Aging — What Is Menopause?
Cited in: Hormone Replacement Therapy: A Complete Guide for Men and Women
- PubMed — Testosterone Therapy in Men With Hypogonadism: An Endocrine Society Clinical Practice Guideline
Cited in: Hormone Replacement Therapy: A Complete Guide for Men and Women
- Reference values for IGF-I serum concentration in an adult population — VARIETE cohort (PMC)
Cited in: IGF-1: How to Read It
- Sharma et al., "Recent Advances in Therapeutic Peptides," ACS Omega (2025) — PMC
Cited in: Peptide Classes Explained: How Researchers Group Peptides by Mechanism, Peptides: A Research Overview for Hormone and Recovery Optimization
- StatPearls: Physiology, Testosterone (National Library of Medicine)
Cited in: Estradiol (E2): How to Read It, SHBG (Sex Hormone Binding Globulin): How to Read It
- Tan et al., High Estrogen in Men After Injectable Testosterone Therapy: The Low T Experience
Cited in: Estrogen Management on TRT: What the Research Actually Shows
- Testosterone Therapy in Men With Hypogonadism: An Endocrine Society Clinical Practice Guideline
Cited in: Estrogen Management on TRT: What the Research Actually Shows, Finding a TRT-Literate Physician: What to Actually Look For, How TRT Works: Diagnosis, Physiology, and Monitoring, Protocol Literacy Basics: Understanding Structure Without the Numbers, Testosterone Replacement Therapy: A Complete Educational Guide, Estradiol (E2): How to Read It, Hematocrit: How to Read It, Total & Free Testosterone: How to Read It
- The Menopause Society (NAMS) — 2022 Hormone Therapy Position Statement
Cited in: Hormone Replacement Therapy: A Complete Guide for Men and Women
- The Utilization and Impact of Aromatase Inhibitor Therapy in Men With Elevated Estradiol Levels on Testosterone Therapy, Sexual Medicine
Cited in: Estrogen Management on TRT: What the Research Actually Shows
- Walsh et al., Testosterone treatment and the risk of aggressive prostate cancer in men with low testosterone levels, PLOS ONE
Cited in: TRT Myths vs. the Research: What the Evidence Actually Shows
- Yin, Li & Zhang, "The Growth Hormone Secretagogue Receptor: Its Intracellular Signaling and Regulation," Int J Mol Sci (2014) — PMC
Cited in: Peptide Classes Explained: How Researchers Group Peptides by Mechanism, Peptides: A Research Overview for Hormone and Recovery Optimization
- Yuan et al., "From Regeneration to Analgesia: The Role of BPC-157 in Tissue Repair and Pain Management," Int J Mol Sci (2026) — PMC
Cited in: Peptide Classes Explained: How Researchers Group Peptides by Mechanism, Peptides: A Research Overview for Hormone and Recovery Optimization, What "Research Use Only" Actually Means