12 papers reviewed
Adrenal Fatigue, HPA Axis & Stress Physiology
2016 · systematic review · 1 of 12
Adrenal fatigue does not exist: a systematic review
Cadegiani FA, Kater CE · BMC Endocrine Disorders
The definitive review. From 3,470 articles screened, 58 met criteria (33 in healthy individuals, 25 in symptomatic patients), assessing awakening cortisol, cortisol awakening response and salivary cortisol rhythm against fatigue status. Results were systematically conflicting regardless of test quality. The authors identified six problems in the underlying literature: heterogeneous study design, largely descriptive studies, poor fatigue assessment, cortisol methodology not endorsed by endocrinologists, false starting premises, and invalid causal conclusions. Conclusion: no substantiation that adrenal fatigue is an actual medical condition.
Read the paper ↗2022 · guideline · 2 of 12
Adrenal Fatigue — Endocrine Society patient position statement
Endocrine Society · Endocrine Society Endocrine Library
The professional body's position: adrenal fatigue is not a recognized diagnosis, and the tests marketed for it are not based on scientific fact or supported by good studies, so their results and interpretation may not be correct. Notes the symptom list is so general it overlaps depression, sleep apnoea, fibromyalgia, hypothyroidism and many other conditions.
Read the paper ↗2018 · cross-sectional · 3 of 12
Over-the-Counter “Adrenal Support” Supplements Contain Thyroid and Steroid-Based Adrenal Hormones
Akturk HK, Chindris AM, Hines JM, Singh RJ, Bernet VJ · Mayo Clinic Proceedings
The most important safety finding in this category. Twelve OTC adrenal support supplements were assayed: ALL twelve contained thyroid hormone, and most contained at least one steroid hormone — pregnenolone most commonly, but also budesonide (a synthetic glucocorticoid), 17-hydroxyprogesterone, androstenedione, cortisol and cortisone. Products were frequently advertised as hormone-free. Undisclosed glucocorticoid exposure can suppress the HPA axis and cause the very adrenal dysfunction the product claims to treat, and undisclosed thyroid hormone is dangerous in anyone with thyroid disease or trying to conceive.
Read the paper ↗2018 · clinical commentary · 4 of 12
Over-the-Counter Adrenal Supplements: More Than Meets the Eye
— · Mayo Clinic Proceedings
Accompanying editorial placing the assay findings in clinical context and highlighting that patients often take these products without disclosing them, which can confound thyroid and adrenal testing and complicate care.
Read the paper ↗2023 · prospective cohort · 5 of 12
Home Waking Salivary Cortisone to Screen for Adrenal Insufficiency
— · NEJM Evidence
Crucial distinction the adrenal fatigue debate obscures: salivary steroid testing IS validated — for diagnosing genuine adrenal insufficiency. Home waking salivary cortisone performed well as a screening test and could avoid ACTH stimulation testing in some patients. The problem with adrenal fatigue panels is not saliva as a medium; it is using diurnal cortisol curves to diagnose a condition that has not been shown to exist.
Read the paper ↗2023 · review · 6 of 12
Expanding the use of salivary cortisol as a non-invasive outpatient test in the dynamic evaluation of suspected adrenal insufficiency
— · Endocrine / PMC
Reviews the legitimate clinical role of salivary cortisol in evaluating suspected adrenal insufficiency, reinforcing that the diagnostic standard remains low serum cortisol confirmed by ACTH stimulation testing rather than multi-point diurnal curves.
Read the paper ↗2016 · case series · 7 of 12
Primary Adrenal Insufficiency Misdiagnosed as Hypothyroidism in a Patient with Polyglandular Syndrome
— · Case Reports in Endocrinology / PMC
True adrenal insufficiency is rare but dangerous to miss, and its presentation overlaps hypothyroidism — particularly in autoimmune polyglandular syndrome, where both can coexist. Adrenal insufficiency can also cause reversible subclinical hypothyroidism, so thyroid tests should be reassessed after adrenal treatment. Relevant to this app's users because autoimmune thyroid disease is common in the fertility population.
Read the paper ↗2025 · review · 8 of 12
Cortisol Awakening Response: Regulation and Functional Significance
— · Endocrine Reviews
The real physiology behind the pop concept. Cortisol peaks 30–45 minutes after waking, normally rising at least 50% above waking level, and roughly 73–77% of healthy adults show a typical response. A blunted response has been associated with burnout and chronic fatigue — but the literature is inconsistent, the function of the response remains poorly understood, and it is a research instrument rather than a diagnostic test.
Read the paper ↗2016 · guideline · 9 of 12
Assessment of the cortisol awakening response: expert consensus guidelines
Stalder T et al. · Psychoneuroendocrinology
Consensus methodology for measuring the cortisol awakening response, including strict requirements on sampling timing relative to waking, adherence verification and confounder control. Most commercial panels do not meet these conditions, which is a major reason results are unreliable in routine practice.
Read the paper ↗2018 · cohort · 10 of 12
Midday and nadir salivary cortisol appear superior to cortisol awakening response in burnout assessment and monitoring
— · Scientific Reports / PMC
Even where HPA differences do appear in burnout, the awakening response was not the most informative measure — midday and nadir cortisol discriminated better and moved with treatment. Undercuts the specific panel design most commonly sold for adrenal fatigue.
Read the paper ↗2019 · review · 11 of 12
Neural and endocrine mechanisms underlying stress-induced suppression of pulsatile LH secretion
— · Molecular and Cellular Endocrinology
The accurate mechanism linking stress to cycles. CRH inhibits pulsatile GnRH release, acting as the intermediary between stressors and the reproductive axis, with KNDy/kisspeptin neurons in the arcuate nucleus as the pulse generator and amygdala circuits as upstream regulators. Clinically this presents as functional hypothalamic amenorrhea — not as 'tired adrenals'. For a woman told she has adrenal fatigue whose cycles have become irregular or absent, FHA is the diagnosis worth investigating, and it has an Endocrine Society guideline and a defined treatment.
Read the paper ↗2025 · review · 12 of 12
An Integrative Approach to HPA Axis Dysfunction: From Recognition to Recovery
— · American Journal of Medicine
Contemporary framing of genuine HPA axis dysregulation as distinct from the adrenal fatigue construct, noting that where low cortisol occurs the problem is generally upstream in the brain and central nervous system rather than exhausted adrenal glands.
Read the paper ↗A paper's presence documents the evidence reviewed; it does not mean Filia endorses every intervention or conclusion.