Cortisol Deficiency Test
Assess your cortisol level with this questionnaire inspired by the work of Dr. Thierry Hertoghe. Cortisol is the stress adaptation hormone produced by the adrenal glands. A deficiency (adrenal insufficiency) causes deep fatigue, allergies and stress hypersensitivity.
Cortisol is the stress adaptation hormone produced by the adrenal glands under the control of the hypothalamic-pituitary-adrenal (HPA) axis. In physiological quantities, it allows us to face daily challenges, regulate inflammation and maintain stable blood glucose. However, when stress becomes chronic, the adrenal glands eventually become exhausted and cortisol production drops, a state often called adrenal fatigue or functional adrenal insufficiency. The result is deep flu-like fatigue, stress hypersensitivity, allergies, hypotension and cravings for sugar or salt. Dr. Thierry Hertoghe, a Belgian endocrinologist and president of the World Society of Anti-Aging Medicine, has extensively documented this deficiency in his works. His clinical approach makes it possible to identify adrenal insufficiency through characteristic physical signs, often well before salivary cortisol confirms the deficiency. This questionnaire is inspired by his work and his Atlas of Hormonal Medicine.
Points forts
- + Detects early signs of adrenal exhaustion before collapse
- + Connects often overlooked symptoms (fatigue, allergies, hypotension) to an adrenal cause
- + Guides toward a natural adrenal support protocol (adaptogens, vitamin C, B5)
Limites
- - Symptoms of cortisol deficiency and excess can overlap
- - Self-assessment does not distinguish between different phases of adrenal fatigue
- - A 4-point salivary cortisol measurement throughout the day is necessary for accurate diagnosis
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Understanding cortisol's role
Cortisol is a steroid hormone produced by the fascicular zone of the adrenal cortex, under the control of pituitary ACTH which itself is regulated by hypothalamic CRH: this is the HPA axis (hypothalamic-pituitary-adrenal). Its circadian rhythm is fundamental: the morning peak (between 7 and 10 ng/mL in salivary cortisol) triggers wakefulness, vigilance and mobilization of energy reserves, while its progressive decline in late afternoon allows the transition to rest and melatonin secretion. At the metabolic level, cortisol regulates blood glucose through hepatic gluconeogenesis, modulates the inflammatory response by inhibiting pro-inflammatory cytokines (IL-1, IL-6, TNF-alpha) and supports blood pressure through its effect on sodium retention. It also plays a major role in immune resistance, bone metabolism and pain management. In physiological quantity, it is a protective and adaptogenic hormone; it is its chronic excess or deficiency that becomes pathological.
Monitoring markers
Dr. Hertoghe emphasizes the importance of early clinical signs even before biological confirmation: a face beginning to hollow out, the appearance of marked dark circles, skin that becomes reactive or allergic, blood pressure tending to drop below 100/60 mmHg. These physical signs, often overlooked, are actually the first indicators of early adrenal fatigue. On the laboratory side, salivary cortisol measurement at 4 points during the day (8am, 12pm, 4pm, 10pm) is the gold standard as it reflects the free and biologically active fraction of cortisol, unlike blood cortisol which measures total cortisol (bound to CBG). DHEA-S (dehydroepiandrosterone sulfate) is a valuable complementary marker because DHEA is the main adrenal androgen and its decline often precedes that of cortisol. The cortisol/DHEA ratio is particularly informative: a high ratio indicates chronic stress with pregnenolone diversion toward cortisol at the expense of DHEA.
Daily prevention
The protection of your adrenal glands rests on three fundamental pillars: sleep, movement and stress management. Go to bed before 10:30 pm to respect the cortisol circadian rhythm and aim for 7 to 8 hours of sleep in a cool, dark room without screens for at least one hour before. Practice moderate and regular physical activity (nature walks, yoga, gentle swimming) without ever slipping into overtraining which excessively stresses the HPA axis. Integrate daily stress management techniques such as heart rate coherence (5 minutes, 3 times a day, 6 breaths per minute) which has demonstrated its ability to regulate vagal tone and heart rate variability. Finally, maintain balanced and regular meals with sufficient protein, good fats and complex carbohydrates to avoid reactive hypoglycemia which forces the adrenal glands to release cortisol in emergency mode.
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Physiopathology of adrenal exhaustion
The general adaptation syndrome described by Hans Selye in 1936 unfolds in three distinct phases. The alarm phase corresponds to the immediate reaction to stress with release of adrenaline then cortisol: this is the fight-or-flight response. The resistance phase sets in when stress becomes chronic: the adrenal glands maintain elevated cortisol production at the cost of massive pregnenolone diversion (pregnenolone steal), depriving DHEA, progesterone and testosterone of their precursor. The exhaustion phase occurs when the adrenal glands can no longer respond to demand: cortisol drops, the circadian curve flattens, and the body loses its ability to adapt to stress. This cortisol deficiency leads to removal of the anti-inflammatory brake (explosion of allergies, eczema, asthma), blood glucose dysregulation (reactive hypoglycemia with cravings) and blood pressure drop due to loss of sodium retention. Immunity shifts to a predominantly Th2 profile, favoring allergic and autoimmune reactions.
Clinical markers vs laboratory markers
Dr. Hertoghe distinguishes clinical markers (observable physical signs) from biological markers, and emphasizes that the former often appear months or even years before biology deteriorates. Characteristic clinical signs include a face starting to hollow with marked dark circles, thin translucent skin that heals poorly, allergic skin reactions (eczema, urticaria, dermatitis) and low blood pressure (often below 100/60 mmHg with orthostatic hypotension). Fatigue is typically flu-like in nature with body aches and a constant feeling of being ill. In biology, salivary cortisol at 4 points (8am, 12pm, 4pm, 10pm) is the reference examination: normal morning values range between 7 and 10 ng/mL, with progressive decline; a flat curve or insufficient morning peak indicates adrenal exhaustion. DHEA-S is an essential complementary marker: its ratio with cortisol (cortisol/DHEA ratio) allows assessment of the anabolism/catabolism balance, and an elevated ratio indicates chronic stress with dominant catabolism.
Adrenal support nutrition
The nutritional strategy aims to stabilize blood glucose and provide the cofactors essential for adrenal function. Divide your meals into 5 to 6 daily servings (3 meals + 2 to 3 protein snacks) to avoid blood sugar dips that force your adrenal glands to release cortisol in emergency mode: each meal must contain a source of protein, a good fat and complex carbohydrates. Avoid intermittent fasting which is contraindicated in case of adrenal fatigue because it excessively stresses cortisol-dependent gluconeogenesis. Prioritize foods rich in vitamin C (kiwi, red pepper, broccoli, citrus) which is the number one cofactor for cortisol synthesis: the adrenal glands are the body organ that concentrates the most vitamin C. Foods rich in pantothenic acid (vitamin B5) are equally essential: avocado, shiitake mushrooms, egg yolk, sunflower seeds and lentils. Eliminate or drastically reduce coffee and alcohol which artificially stimulate the adrenal glands and accelerate their exhaustion, and replace them with licorice infusions (except in case of hypertension) or blackcurrant tea.
Targeted supplementation
Vitamin C is the pillar of adrenal supplementation: the adrenal glands contain 100 times more of it than blood, and its consumption increases considerably under stress. A dose of 1 to 3 g per day divided into several servings (buffered or liposomal forms for digestive tolerance) is recommended. Pantothenic acid (vitamin B5) at 500 mg per day is the direct cofactor of coenzyme A, essential for adrenal steroidogenesis and cellular energy production. Magnesium bisglycinate (300 mg per day, preferably in the evening) participates in over 300 enzymatic reactions and is massively consumed by stress: its deficiency worsens neuro-muscular hyperexcitability and sleep disorders. DHEA can be considered if DHEA-S testing confirms a deficiency, generally at doses of 10 to 25 mg per day in women and 25 to 50 mg in men, under medical supervision. Phosphatidylserine (300 mg per day in the evening) has demonstrated its ability to modulate the cortisol response to stress and improve the cortisol/DHEA ratio.
Lifestyle and stress management
Rest is the first medicine for adrenal fatigue: aim for bedtime before 10 pm, as the optimal adrenal recovery window is between 10 pm and 2 am, a period of maximum adrenal cortex regeneration. Ban screens at least one hour before bedtime, as blue light suppresses melatonin and keeps the HPA axis in an alert state. Heart rate coherence (3 sessions of 5 minutes per day, at 6 breaths per minute) is the most validated stress management technique to regulate the autonomic nervous system and lower cortisol: practice it upon waking, before lunch and in late afternoon. Favor gentle physical activities (nature walks, restorative yoga, tai-chi, slow swimming) and absolutely avoid intense exercise, HIIT and long-distance running which massively stress the adrenal glands and worsen exhaustion. A 20-minute nap in early afternoon (between 1 pm and 3 pm) is strongly encouraged as it allows significant adrenal micro-recovery. Grounding (walking barefoot on grass or soil) has shown measurable effects on reducing salivary cortisol and improving vagal tone.
Herbal medicine and adaptogens
Adaptogenic plants form the phytotherapeutic foundation of adrenal support: they work by modulating the HPA axis without excessively stimulating or inhibiting it. Ashwagandha (Withania somnifera), preferably in KSM-66 standardized extract form at 600 mg per day, has demonstrated in several clinical trials its ability to reduce salivary cortisol by 20 to 30% and improve stress resistance. Rhodiola rosea (Rhodiola rosea) at 400 mg in the morning (extract standardized to 3% rosavines and 1% salidroside) is particularly indicated for mental fatigue, difficulty concentrating and cognitive exhaustion related to cortisol deficiency. Eleuthero (Eleutherococcus senticosus), or Siberian ginseng, strengthens physical endurance and stress tolerance at 300 to 400 mg per day. Holy basil (Ocimum sanctum or tulsi) is a milder adaptogen, ideal as a daily infusion, which regulates blood glucose and anxiety related to adrenal stress. In gemmotherapy, blackcurrant bud (Ribes nigrum) is the indispensable reference: at 5 to 15 drops in the morning in concentrated glycerin macerate, it stimulates the adrenal cortex and possesses natural cortisone-like anti-inflammatory and anti-allergic action.
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Physiopathology of severe adrenal collapse
Selye's phase 3, or exhaustion phase, represents complete failure of the adrenal adaptive system. Unlike the resistance phase where cortisol is still secreted (sometimes even in excess), this phase is characterized by flat cortisol (flatline pattern): the adrenal glands, exhausted by months or years of chronic solicitation, can no longer produce sufficient quantities of cortisol, regardless of stress intensity. Pregnenolone steal reaches its peak: this common precursor of all steroid hormones is monopolized by the desperate attempt to maintain minimum cortisol, at the catastrophic expense of DHEA (anabolism collapse), progesterone (cycle disturbances, estrogen dominance), testosterone (muscle wasting, fatigue, libido loss) and even thyroid hormones through inhibition of type 1 deiodinase which converts T4 to active T3. Chronic low-grade systemic inflammation sets in because the anti-inflammatory brake of cortisol is removed: pro-inflammatory cytokines (IL-1, IL-6, TNF-alpha) circulate freely, maintaining diffuse pain, brain fog and central fatigue. Immunity shifts to dominant Th2 profile with multiplication of allergic reactions and autoimmune responses, while anti-infectious defense (Th1) collapses, explaining recurrent infections. This pathological cascade explains why severe adrenal insufficiency so often mimics fibromyalgia, chronic fatigue syndrome or treatment-resistant depression.
Mandatory hormonal assessment
At this level of symptoms, biological assessment is no longer optional but mandatory, and should be performed as soon as possible with a physician trained in functional endocrinology or anti-aging medicine. Salivary cortisol at 4 points (8am, 12pm, 4pm, 10pm) is the first-line examination: expect a flat pattern with a collapsed morning peak (often below 3-4 ng/mL instead of 7-10 ng/mL) and low values throughout the day. DHEA-S testing is essential because it reflects adrenal androgenic reserves and its collapse confirms overall adrenal steroidogenesis exhaustion. 24-hour urine free cortisol and ACTH stimulation testing (Synacthene test) allow differentiation of functional adrenal insufficiency (adrenal fatigue) from primary adrenal insufficiency (Addison's disease). In severe or atypical cases, screening for anti-adrenal antibodies (anti-21-hydroxylase) is recommended to exclude an autoimmune component. Dr. Hertoghe also recommends complete thyroid assessment (TSH, free T4, free T3, anti-TPO and anti-thyroglobulin antibodies) because the thyroid and adrenal axes are intimately linked and often collapse together.
Nutrition for adrenal recovery
In case of severe adrenal insufficiency, nutrition becomes a true therapeutic tool and must be structured with rigor. Eat every 3 hours without exception (6 to 7 daily servings) to maintain stable blood glucose: each serving must combine quality animal proteins (eggs, fish, meat), good fats (avocado, olive oil, nuts) and complex carbohydrates (sweet potato, brown rice, quinoa). Fasting is formally contraindicated in all forms (intermittent, prolonged, calorie restriction) because it stresses cortisol-dependent gluconeogenesis and accelerates adrenal collapse. Include bone broth daily (1 to 2 cups per day): rich in glycine, proline, glutamine and bioavailable minerals, it supports the often hyperpermeablе intestinal mucosa in adrenal insufficiency and provides amino acids needed for tissue repair. Completely eliminate all stimulants without exception: coffee, black tea, green tea, pure cocoa, energy drinks, alcohol and refined sugar, which artificially whip exhausted adrenal glands and worsen the collapse cycle. Increase your intake of unrefined sea salt (French grey salt or Himalayan pink salt) because cortisol deficiency leads to sodium loss through the kidneys that contributes to hypotension, dizziness and cramping.
Intensive supplementation
The supplementation protocol in severe adrenal exhaustion phase must be more aggressive and prolonged than in moderate forms. Vitamin C is dosed at 3 to 5 g per day (liposomal or buffered sodium ascorbate form), divided into 4 to 5 servings, because exhausted adrenal glands consume massive quantities of ascorbic acid trying to maintain residual steroidogenesis. Pantothenic acid (vitamin B5) is increased to 1000 mg per day in two servings (morning and noon), combined with a complete B complex to ensure synergy of cofactors of the mitochondrial energy chain. Magnesium bisglycinate is dosed at 400-600 mg per day (evening and bedtime) to counter the neuro-muscular hyperexcitability, cramping and insomnia related to massive magnesium depletion induced by chronic stress. Adrenal glandular extracts (adrenal glandulars, from grass-fed bovine or porcine sources) can be considered at 200 to 500 mg per day to directly provide the peptides and cofactors needed for adrenal tissue regeneration. Pregnenolone (10 to 50 mg per day in the morning, under medical supervision) can be considered to restore the upstream precursor of the entire steroid cascade, thereby bypassing pregnenolone steal and allowing redistribution toward DHEA, progesterone and testosterone.
Absolute rest and lifestyle restructuring
At this stage of adrenal exhaustion, rest is not an option but an absolute therapeutic necessity, and work cessation should be seriously considered if your professional activity is a significant source of stress. Transform your bedroom into a sleep sanctuary: total light blocking, temperature between 16 and 18 degrees Celsius, no electronic devices, possible diffusion of true lavender, and mandatory bedtime before 10 pm because the window of maximum adrenal regeneration is between 10 pm and 2 am. Any intense physical activity is formally prohibited: no running, no HIIT, no heavy weightlifting, no competitive sports, because each intense session triggers a cortisol release that your exhausted adrenal glands cannot provide, worsening muscle catabolism and exhaustion. Limit yourself exclusively to slow walking in nature (20 to 30 minutes maximum), restorative yoga (postures held passively with pillow support) and gentle stretching. Daily 20 to 30-minute nap between 1 pm and 3 pm becomes mandatory and non-negotiable to allow adrenal micro-recovery. Practice heart rate coherence 4 to 5 times per day (not just 3) and consider complementary techniques for autonomic nervous system regulation: mindfulness meditation, sophrology, alternate nostril breathing (nadi shodhana) and daily grounding of 20 minutes barefoot on soil.
Herbal medicine and reinforced adaptogenic protocol
In case of severe adrenal exhaustion, the phytotherapeutic protocol must be more powerful, combined and maintained over a long duration of 6 to 12 months minimum, because adrenal tissue regeneration is a slow process requiring patience and consistency. The synergistic combination of three major adaptogens is recommended: KSM-66 ashwagandha (600 mg morning and evening, or 1200 mg per day) for its powerful anti-cortisol action and adrenal regenerative effects, rhodiola rosea (400 mg in the morning, standardized extract) for cognitive support and mental fatigue resistance, and eleuthero (400 mg morning and noon) for physical endurance and overall stress resistance. Holy basil (tulsi) as an infusion throughout the day (3 to 4 cups) completes this protocol through its gentle and continuous action on blood glucose and anxiety. Licorice (Glycyrrhiza glabra) is a precious ally in case of marked hypotension because glycyrrhizic acid inhibits 11-beta-hydroxysteroid dehydrogenase, thus prolonging the half-life of residual cortisol; however, it is formally contraindicated in case of hypertension and should not be used for more than 6 consecutive weeks without a break. In gemmotherapy, blackcurrant bud (Ribes nigrum) at reinforced dose (15 to 20 drops in the morning, in concentrated macerate) constitutes the pillar of adrenal regeneration, and can be combined with oak bud (Quercus robur, 10 drops in the morning) for its deep tonic action on the adrenal glands and gonads.
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