How Perimenopause and Menopause Changes Brain Chemistry and Impacts Our Neurotransmitters

How Perimenopause and Menopause Changes Brain Chemistry and Impacts Our Neurotransmitters

by | Oct 2, 2025 | Koru Nutrition Blog

A variety of protein powder and shakes.

Perimenopause and menopause are defined by large, sometimes chaotic falls in ovarian hormones — primarily estradiol (estrogen) and progesterone. When this happens these hormone changes have measurable downstream effects on our brain chemistry. This can result in mood changes, anxiety, sleep problems, hot flashes, and memory/attention issues. 

Women typically go through perimenopause in their mid 40’s and this can last on average 4 years but can be as long as 8 years. Menopause (when periods have fully stopped typically occurs around 51 but obviously there are huge fluctuations with that). Many people are surprised to learn that the drop in hormones has a huge impact on the brain’s chemical messengers — called neurotransmitters.

Understanding which brain chemicals are impacted — and what you can do about it — can make this transition easier.

Why Hormones Matter for Your Brain

Estrogen and progesterone aren’t just reproductive hormones. They play powerful roles in the brain, where they interact with neurotransmitters that regulate mood, thinking, energy, and sleep.

Estrogen 

  • boosts serotonin (the “feel-good” chemical)
  • boosts dopamine (motivation, focus and reward)
  • boosts acetylcholine (memory and focus).

Progesterone 

  • is converted into a substance called allopregnanolone, which helps the neurotransmitter GABA to calm the mind and promote a sense of relaxation.

When these hormones decline in perimenopause and menopause, the balance of brain chemistry shifts — often in ways that make people feel more anxious, moody, forgetful, and tired.

The Neurotransmitters Most Affected

  1. Serotonin — mood, sleep, and thermoregulation

What changes: Estrogen helps the brain make and use serotonin when estrogen drops, serotonin levels can fall too. Clinically, this is linked to higher rates of depression, mood swings, irritability, sleep problems, and even hot flashes (since serotonin helps regulate body temperature). (1)

Research shows that perimenopausal women have a 40% higher risk of experiencing depression than premenopausal women.

  1. GABA (gamma-aminobutyric acid) — inhibition, anxiety, and sleep

What changes: Progesterone is metabolized in the brain to allopregnanolone, which helps GABA calm the nervous system. With falling progesterone in perimenopause/menopause, levels of allopregnanolone fall so, there’s less of this calming effect. This results in increased anxiety, irritability, hypervigilance, difficulty managing stress and trouble sleeping. (1)

  1. Dopamine — motivation, reward, and attention

What changes: Estrogen supports dopamine synthesis, release, and receptor expression in brain regions responsible for feelings of reward, focus and cognitive functioning. Loss of estrogen can cause dopamine to drop, which may contribute to feelings of apathy, reduced motivation, concentration difficulties, and “brain fog.” Imaging and clinical studies connect estrogen fluctuations/deficiency with modest declines in cognitive domains and with functional changes in dopamine-linked circuits. (1)

  1. Norepinephrine — Arousal and the thermoregulatory “set point”

What changes: When estrogen falls, hypothalamic regulation of autonomic and thermoregulatory circuits becomes more sensitive and this can result in norepinephrine becoming overactive. Norepinephrine helps to keep us alert. This dysregulation is a major component of vasomotor symptoms (hot flashes and night sweats) and night-time awakenings. The serotonin–norepinephrine balance is also important (lower serotonin can also contribute to norepinephrine over-activity). (2) 

  1. Acetylcholine — memory and attention

What changes: Estrogen supports acetylcholine which is a neurotransmitter important for attention and episodic memory, especially in the hippocampus (our memory centre). Decreased estrogen is associated with decreases in verbal memory, memory lapses and difficulty with new learning; this pattern is complex and varies by timing (perimenopause vs years after menopause), age, vascular health, and other factors. (3)

How Big is the Effect Clinically?

Not every person experiences marked changes in mood, cognition, or sleep — genetics, prior psychiatric history, life stressors, nutrition, sleep quality, comorbid medical conditions, and the pattern/timing of hormonal change all influence risk. Large cohort and meta-analytic work show increased risk for depressive and anxiety symptoms during the perimenopause transition and more subjective cognitive complaints during the transition and early post menopause. Still, the effects vary considerably: some people experience large, disabling symptoms; others experience little change. (4) 

Summary

Perimenopause and menopause change brain chemistry because estrogen and progesterone directly modulate serotonin, dopamine, GABA, norepinephrine, and acetylcholine systems. These changes can explain increased rates of mood symptoms, anxiety, sleep disruption, vasomotor symptoms, and cognitive complaints for many people in the menopause transition. 

The best approach depends on symptom type, severity, personal medical history (including cardiovascular risk, clotting risk), and preferences. Discuss options with a clinician experienced in menopause care. It is important to note (and I have heard this my so many woman) that their doctors do not know how to address their menopause symptoms and often refer to “its just a part of getting older” despite symptoms being frustrating, and even disabling. These horomal changes and subsequent symptoms can significantly impact a women’s ability to engage in work activities, parenting, interefer with their relationships, impact their self esteem, body image and overall enjoyment in life. It is important to do your due diligence to find health care professionals that specialise in peri-menopause and menopause to get the right help that you need.

To find out more about what you can do please check out our other helpful articles on nutrition, supplements, herbs and exercise for perimenopause and menopause women as well as a couple of delicious recipes designed with you specifically in mind:

 
 
Check out these delicious recipes specifically formulated for women going through the change:
 
 

Selected scientific references (key reviews & trials cited above)

  1. https://pmc.ncbi.nlm.nih.gov/articles/PMC2943238/
  2. https://journals.lww.com/jomh/fulltext/2019/10010/menopausal_hot_flashes__a_concise_review.3.aspx?utm
  3. https://pmc.ncbi.nlm.nih.gov/articles/PMC8394691/
  4. https://www.theguardian.com/society/2024/may/01/perimenopausal-women-have-40-higher-risk-of-depression-study-suggests
Struggling with Cravings, Feeling Burnt Out, Anxious, and Unable to Sleep? Then You May Have Low GABA…

Struggling with Cravings, Feeling Burnt Out, Anxious, and Unable to Sleep? Then You May Have Low GABA…

by | May 1, 2025 | Koru Nutrition Blog

A variety of protein powder and shakes.

What is GABA?

Gamma-aminobutyric acid (GABA) is a neurotransmitter — a brain chemical that sends messages throughout the central nervous system. As an inhibitory neurotransmitter, GABA blocks or inhibits certain nerve transmissions. This slowdown in message transmission may help modulate mood and anxiety. In other words, GABA calms your nervous system down so you don’t become overly anxious or afraid. This is why GABA supplements are marketed for stress relief.

Dysregulation of GABAergic neurons can affect mental health and contribute to a variety of psychiatric and neurologic disorders such as multiple sclerosis, alcoholism, PMS, tics, Lyme-induced anxiety, PCOS, and issues experienced by neurodivergent individuals. However, low GABA can also occur in the average person without any specific health condition.

Do You Have Low GABA?

You might if you experience the following symptoms:

  • Feeling anxious, worried, or fearful

  • Unable to relax or loosen up

  • Physical tension/stiff or tense muscles

  • Easily overwhelmed

  • Feeling stressed and burned-out

  • Feelings of panic

  • Intrusive/unwanted thoughts

  • Fear of heights (and other situation-specific fears)

  • Problems with sleep

  • Spinning and attention/focus issues when anxious

  • Anger, rage, and agitation

  • Pain and/or spasms (rectum, belly, back, bladder, throat)

  • Sugar/carb cravings when stressed

  • Self-medicating with alcohol

Is This You? Then You May Want to Consider Supplementing with GABA

GABA helps calm the mind, improve sleep and anxiety, and reduce or resolve cravings for carbs, sugar, and alcohol.

How Do I Know if I Have Low GABA?

Blood or urine tests are not effective or accurate. The best way to assess low GABA is by the number of symptoms you experience from the list above.

How Should I Take GABA?

The most important thing to remember is that GABA must be taken sublingually — popping pills is not effective.
You must use either:

  • GABA liposomal sprays

  • GABA powders placed on the tongue

  • GABA lozenges that you suck on

These should be held in the mouth for 1–2 minutes. GABA creams can also be used, but the above methods are preferred.

Additional Tips:

  • Take GABA ideally 1 hour away from protein.

  • A good starting dose is 125mg.

  • Observe how you feel (refer to the checklist above) to note improvements.

  • If no change occurs, repeat the dose and check again 15 minutes later.

  • GABA lasts 3–4 hours, so you may need to repeat the dose later in the day or multiple times a day to get the optimal results.

  • Adjust your dosage every 3–7 days.

  • Sometimes, trying different GABA products is necessary to find the most effective one.

For the best GABA supplements, please go here to purchase.

GABA Warning

You need to increase dosages and frequencies slowly. If you take more than you need or increase your dose too quickly, you may experience:

  • Lightheadedness or dizziness

  • Feeling overly relaxed or sleepy

  • Difficulty getting up in the morning

  • Increased anxiety

If you take too much GABA and experience adverse symptoms, the antidote is 1000mg of Vitamin C — taken as soon as possible.
One dose is sufficient, and effects should be noticed within a few minutes, but it will also counteract the positive effects of GABA.

Why Does GABA Supplementation Not Work for Some People?

Many practitioners:

  • Recommend oral pills instead of sublingual forms.

  • Suggest once-a-day dosing instead of multiple smaller doses.

  • Prescribe a one-size-fits-all approach (which often doesn’t work).

  • Recommend doses that are too high (500–750mg).

  • Combine GABA with other supplements, making it difficult to monitor results.

When trialing GABA, you should introduce only GABA initially — not multiple supplements at once.

Other factors like low serotonin, low endorphins, candida overgrowth, or blood sugar fluctuations can also contribute to anxiety, cravings, and sleep issues.It might be necessary to address these issues alongside using GABA.

Summary

GABA is a neurotransmitter that helps people better manage feelings of being stressed overwhelmed, burnt out, feelings of frustration and anger, sugar and alcohol cravings, physical tension, difficulties sleeping and inability focus. It also can be very beneficial for certain health conditions such as results leg syndrome, tics, leaky gut, PCOS and PMS.

GABA is often overlooked or misused, so people miss out on getting the desired relief from their symptoms and optimising treatment outcomes. Choosing the right GABA supplement is crucial.

If you need support selecting the best GABA supplement, identifying if GABA is an issue for you, or implementing a proper trial procedure, please reach out to us Koru Nutrition for guidance.