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Glossary Hypothalamic-Pituitary-Adrenal Axis

regulates stress response through hormone release from brain and adrenal glands

The Hypothalamic-Pituitary-Adrenal (HPA) Axis is a complex network involving the hypothalamus, pituitary gland, and adrenal glands, which work together to regulate the body's response to stress. When you encounter stress, the hypothalamus releases corticotropin-releasing hormone (CRH), prompting the pituitary gland to secrete adrenocorticotropic hormone (ACTH), which in turn stimulates the adrenal glands to produce cortisol, a key stress hormone. This system plays a crucial role in maintaining homeostasis and can impact various bodily functions, including immune response and metabolism.

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Research

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research Sex differences in the hypothalamic–pituitary–adrenal axis’ response to stress: an important role for gonadal hormones

197 citations , January 2019 in “Neuropsychopharmacology”

This review discusses sex differences in the neuroendocrine response to stress, focusing primarily on rodent studies, and highlights open questions about the roles of gonadal hormones and sex chromosomes.

research Alopecia areata – hyperactivity of the hypothalamic–pituitary–adrenal axis is a myth?

5 citations , May 2017 in “Journal of the European Academy of Dermatology and Venereology”

In this study, plasma levels of MSH and cortisol in patients with alopecia areata did not show significant changes compared to healthy controls.

research Hypothalamic-pituitary-adrenal axis, hair, and sebum: Stress-mediated dermatologic disasters of the pandemic era

September 2025 in “Cosmoderma”

This study highlights how the COVID-19 pandemic has exacerbated stress-related dermatological issues like acne and hair loss by affecting skin and hair cycles through stress hormones, emphasizing the need for comprehensive psychoneuroendocrine-informed approaches to diagnosis and treatment.

research The local hypothalamic–pituitary–adrenal axis in cultured human dermal papilla cells

9 citations , June 2020 in “BMC Molecular and Cell Biology”

This study found that stress hormones, particularly CRF, can inhibit hair growth and induce hair loss by affecting human dermal papilla cells and hair follicles, suggesting a functional HPA axis in these cells.

research Qiviut cortisol reflects hypothalamic–pituitary–adrenal axis activity in muskoxen (Ovibos moschatus)

7 citations , May 2021 in “General and comparative endocrinology”

This study concluded that qiviut cortisol can be used as a measure of HPA axis activity in muskoxen, with hair growth phase and body region affecting cortisol levels.

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community EMA is re-examining Winlevi (clascoterone at lower concentration)

8 upvotes 1 year ago

Clascoterone in Winlevi, a topical AR antagonist, is being re-examined due to concerns about HPA axis suppression in adolescents, but it's unlikely to be banned for adult use in androgenetic alopecia (AGA). The European Medicines Agency recommended refusing Winlevi for acne vulgaris, but this may not affect Breezula's approval for AGA.

community CB-03-01 / Breezula Personal Results

17 upvotes 7 months ago

The user shared their experience with CB-03-01 (Breezula/Clascoterone) for hair loss, noting reduced shedding and improved hair appearance but experiencing significant sleep disturbances and low energy due to HPA axis suppression. They decided to stop using it due to these side effects and are waiting for GT20029 as an alternative.

community There’s actually a quite good chance that next year, we might see a new treatment get FDA approval for the first time in nearly three decades.

78 upvotes 1 year ago

Breezula, a potential new hair loss treatment, may receive FDA approval soon, but it is expected to be a weaker alternative to finasteride and minoxidil. Concerns include its twice-daily application and possible side effects like HPA axis suppression.

community Mechanism of action of alfatradiol (17 alpha estradiol)

5 upvotes 2 years ago

The conversation discusses the mechanism of action of alfatradiol (17 alpha estradiol) in treating hair loss. It explores theories that it either inhibits 5 alpha reductase to prevent T->DHT conversion or aromatizes scalp T into 17-alpha-estradiol to save hair.

community This could be it!!! New treatment increase hair 500%

340 upvotes 9 months ago

Clascoterone (Breezula) shows a potential 500% increase in hair growth, possibly outperforming minoxidil and finasteride. It is in advanced trials, with hopes for FDA approval, but cost and side effects are concerns.

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