Mareo

Ashwagandha (Withania somnifera) is among the most studied adaptogens for adrenal fatigue, acting via modulation of the HPA axis to reduce cortisol in chronically stressed individuals. Multiple randomized, double-blind, placebo-controlled trials demonstrate significant reductions in serum cortisol and perceived stress scores. It is also the pre-eminent adaptogen in Ayurvedic medicine for stress and exhaustion.

DHEA is the primary adrenal androgen and a direct marker of adrenal reserve; it declines with chronic stress and aging. Supplementation has been studied clinically in adrenal insufficiency and HPA axis dysfunction to restore energy, mood, and stress resilience. DHEA-S measurement is a standard biomarker used to assess adrenal fatigue states.

Eleuthero (Eleutherococcus senticosus), also called Siberian Ginseng, has a long history of use in Russian and Chinese medicine for combating fatigue and stress. Research confirms it supports regulation of cortisol levels during stress, enhances stamina and mental endurance, and modulates HPA axis function. The VA Whole Health Library cites it specifically for adrenal support.

Panax ginseng has been used in Traditional Chinese Medicine for millennia to combat fatigue and stress. It supports adrenal function by modulating HPA axis activity and regulating cortisol, and may reduce the impact of chronic stress on the adrenal glands.

L-tyrosine is a precursor to catecholamines (dopamine, norepinephrine, epinephrine) produced by the adrenal medulla, and supplementation is used to replenish depleted neurotransmitter stores in adrenal fatigue. It is included in professional adrenal support formulations and cited in functional medicine protocols.

Licorice root's active compound glycyrrhizin inhibits the enzyme 11β-HSD2, which converts active cortisol to inactive cortisone, thereby extending cortisol availability in tissues. This mechanism is directly relevant to low-cortisol adrenal fatigue and has been investigated clinically in adrenal insufficiency. The VA Whole Health Library and integrative medicine sources identify it as a key adrenal-supportive herb.

Maca (Lepidium meyenii) is a Peruvian adaptogenic root used traditionally to support energy, hormone balance, and resilience. Research suggests its alkaloids interact with the hypothalamic-pituitary-adrenal axis, and extended use is associated with improved hypothalamic and pituitary function that supports adrenal balance.

Magnesium plays a direct regulatory role in HPA axis function; deficiency increases ACTH release, elevates stress hormones, and worsens anxiety. Chronic stress depletes magnesium, creating a feedback cycle that exacerbates adrenal fatigue symptoms. Supplementation is cited in peer-reviewed and integrative medicine literature as a core adrenal support nutrient.

Phosphatidylserine is a phospholipid that blunts the HPA axis stress response, particularly evening cortisol elevation, and is one of the few supplements with direct human clinical evidence for reducing cortisol in stressed individuals. It is used specifically in adrenal fatigue protocols to normalize cortisol patterns.

Rhodiola rosea is a well-documented adaptogen that supports the HPA axis and reduces cortisol awakening response in burnout and stress-related fatigue. A phase III RCT of 60 subjects with stress-related fatigue syndrome found significant anti-fatigue effects and reduced cortisol response. The European Medicines Agency has approved Rhodiola for temporary relief of fatigue and stress symptoms.

Schisandrins are the active compounds in Schisandra chinensis (Wu Wei Zi), an adaptogen used in Traditional Chinese Medicine and Russian phytomedicine for adrenal fatigue, particularly in combination with eleuthero. Research confirms Schisandra's ability to support HPA axis function and combat mental and physical exhaustion.

Vitamin B5 (pantothenic acid) is the direct precursor to coenzyme A, which is required for adrenal steroid hormone synthesis including cortisol. Animal studies show B5 deficiency causes adrenal atrophy; stress increases B5 demand. Functional medicine protocols consistently include B5 as a core adrenal fatigue supplement.

Vitamin B6 (pyridoxine) is a cofactor for numerous enzymatic processes involved in neurotransmitter synthesis (serotonin, dopamine, GABA) and adrenal stress response. It supports the metabolism of neurotransmitters disrupted by chronic stress and is routinely included in adrenal fatigue supplement protocols.

The adrenal glands contain 20–150 times more vitamin C than most body tissues, and vitamin C is a required cofactor for cortisol and catecholamine synthesis. Acute stress depletes adrenal vitamin C within hours. Supplementation is consistently recommended in integrative and functional medicine protocols for adrenal fatigue support.

Zinc is required for the synthesis of adrenal hormones and acts as a cortisol modulator; deficiency elevates serum cortisol levels in animal models. Research supports zinc's role in supporting DHEA production and modulating excessive cortisol output, both key features of adrenal fatigue management.

Adrenal cortex glandular extracts (from bovine tissue) have been used in functional and naturopathic medicine since the early 20th century to support adrenal function and cortisol production. They provide tissue-associated bioactive compounds including cortisol pathway precursors without the stimulatory catecholamines of whole adrenal glandulars. Clinical use is traditional and based on the concept of organotherapy.

Astragalus (Astragalus membranaceus) is a classical adaptogen in Traditional Chinese Medicine used for thousands of years to tonify 'wei qi' (protective energy) and support vitality under stress. It is used in adrenal fatigue protocols for its energy-enhancing, immune-supportive, and blood sugar-regulating effects, which parallel those of Eleuthero.

Borage has a well-established traditional reputation as an adrenal cortex restorative, used in Western herbalism particularly after steroid therapy or periods of chronic stress. Multiple herbal monographs record this use. No clinical trials have confirmed adrenal function outcomes.

Cordyceps (Cordyceps sinensis/militaris) is a medicinal mushroom used in Traditional Chinese Medicine for fatigue, stress adaptation, and adrenal support. It is used by functional medicine practitioners for adrenal fatigue due to its purported adaptogenic and cortisol-balancing properties. Research supports benefits for energy metabolism and fatigue reduction.

Pantethine, as a CoA precursor, is involved in the steroidogenesis pathway required for cortisol and aldosterone synthesis in the adrenal cortex. Older Japanese clinical work suggested pantethine could buffer ACTH-stimulated urinary cortisol metabolite elevations. However, 'adrenal fatigue' is not a validated clinical diagnosis, and robust human RCTs on pantethine for adrenal support are absent.

Pituitary substance is used in glandular therapy traditions as an upstream support for adrenal fatigue protocols, given the pituitary's ACTH output that drives adrenocortical function. Naturopathic formulations combine pituitary and adrenal glandulars for this purpose. No clinical trial evidence supports this application.

Pregnenolone is widely used by functional and integrative medicine practitioners for 'adrenal fatigue,' based on the concept that chronic stress diverts pregnenolone toward cortisol ('pregnenolone steal'), depleting other downstream hormones. This clinical pattern is recognized but adrenal fatigue as a discrete diagnosis lacks conventional medical validation.

Rehmannia is one of the primary herbs prescribed by naturopathic and TCM practitioners for adrenal fatigue, correlating with the TCM pattern of kidney yin deficiency. The NDNR clinical review explicitly links kidney yin deficiency to adrenal fatigue and exhaustion, particularly in perimenopausal women. Multiple practitioner monographs list adrenal support as a core indication.

Rehmannia is described in multiple practitioner references as a primary adrenal tonic used for adrenal fatigue, stress-induced exhaustion, and conditions of depleted cortisol reserve. It is considered the most important Chinese herb for kidney and adrenal gland disorders in TCM.

Whole adrenal glandular supplements (bovine-derived) have been used in traditional and naturopathic medicine since the early 20th century to support adrenal function and stress recovery. They contain tissue from both the cortex and medulla and are used as nutritional matrices to support HPA axis function. Clinical evidence is primarily traditional and experiential.