Perimenopause Anxiety in Your 40s: Hormonal Causes Explained

If you’re in your forties and anxiety has crept up on you seemingly out of nowhere, you’re not imagining it. That unexplained sense of dread, the 4am wake-ups with a racing heart and that feeling that you’re somehow losing control of your own mind… these are things we hear about all the time in our clinic. It may not actually be a mental health crash, but it could be the beginning of your perimenopause.

For many women, anxiety is actually the very first sign that hormones are shifting, and it can arrive months or even years before the hot flushes, irregular periods and the brain fog that most people associate with midlife hormonal changes and the menopause.

In our clinical experience, when women come to us describing a sudden and bewildering onset of anxiety, often after decades of feeling emotionally steady, the hormonal connection is one of the first things we explore. The relief they feel just hearing that there is a biological reason behind it all can be enormous.

The good news is that you really don’t have to struggle through perimenopause feeling this way. There are specific nutrients and herbs, backed by solid research, that can help to calm your nervous system and support your hormonal balance from the inside out.

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What’s actually happening in your brain?

During the perimenopausal years, oestrogen doesn’t simply decline in a steady line as you would expect. It fluctuates wildly, surging and plummeting like a rollercoaster, and it’s this unpredictability that causes so much of the trouble.

This is partly because oestrogen directly influences serotonin, your key mood-stabilising neurotransmitter, by supporting its production and increasing the sensitivity of your serotonin receptors in the brain. When oestrogen drops, often serotonin levels falls with it too.

Meanwhile, progesterone, which often drops earlier and more sharply than oestrogen does, plays its own critical calming role. A metabolite of progesterone called allopregnanolone acts on your brain’s GABA receptors that helps you keep balanced and relaxed. Think of GABA as your nervous system’s brake system, the neurotransmitter that tells your brain to slow down and keep calm. When your progesterone falls, your GABA activity also decreases, and your brain can get stuck in a kind of low-level “fight or flight” mode, leaving you feeling anxious, and often with an uncomfortable feeling of being wired but tired.

This is why so many women spend months being told their anxiety is just stress or the beginnings of a mental health crash, when the real driver is actually hormonal.

What about HRT?

Many women ask me whether Hormone Replacement Therapy can help with perimenopausal anxiety, and the real answer is that it really does depend on the individual person and how well you respond to HRT.

A systematic review presented at The Menopause Society’s 2025 annual meeting found that oestrogen-based HRT does not consistently reduce anxiety on its own, but modest benefits in anxiety symptoms were seen in women who were in early perimenopause and were also experiencing other symptoms like night sweats and sleep disruption. Micronised progesterone is supposed to be particularly helpful for the anxiety-type symptoms, because it supports GABA activity in the brain, which has a direct calming effect.

HRT is therefore well worth discussing with your GP or a menopause specialist, especially if your anxiety symptoms are significantly affecting your quality of life, but they might not be the full answer. The good news is that we find in our clinic that the nutritional strategies below work beautifully alongside HRT for women who choose it, and they also offer real support for women who prefer not to go down the HRT route or who want to address their nutritional foundations first.

Nutrients and herbs that can help

From my clinical experience, using a combination of targeted nutrients and research-backed herbs supports the neurotransmitter and hormonal pathways that are being disrupted during the perimenopausal years. Every woman’s picture is a little different, but these are some of the key players I turn to again and again when women are experiencing midlife anxiety. I recommend starting one new supplement at a time so you can gauge how well you are responding to it and then build in the next one if you feel you need additional support.

Magnesium

If there’s one nutrient I’d highlight as non-negotiable during perimenopause, it’s magnesium. Oestrogen helps your body absorb magnesium, so as oestrogen declines, magnesium can fall too, creating a double blow at the time you need it most.

Diet-wise, prioritise green vegetables, dark green salad leaves, nuts, seeds and dark chocolate. Magnesium bisglycinate is often the best form to supplement with, as it’s well absorbed, it is gentle on the stomach, and the amino acid glycine within it also supports a lovely calm feeling and better quality sleep.

Vitamin B6

Vitamin B6 is needed for the synthesis of serotonin, dopamine and GABA, which are the very neurotransmitters that your fluctuating hormones are disrupting. Research has shown that B6 can help balance oestrogen and progesterone and, in turn, they can help with perimenopausal anxiety.

Foods which contain vitamin B6 include salmon, chicken, turkey, calves’ liver, potatoes, bananas and chickpeas. If you are supplementing, I recommend choosing the pyridoxal 5-phosphate (P5P) form, which is the most bioavailable, and is tolerated best.

Omega-3 fatty acids

Studies have found a reduction in anxiety alongside reduced inflammatory markers when taking omega-3 as a supplement and consuming plenty of oily fish. The anti-inflammatory effect from omega-3 really matters because fluctuating hormones can drive up inflammation in the body and brain, which can worsen your mood.

Omega-3 fatty acids come from eating plenty of oily fish which include sardines, anchovies, salmon and mackerel as well as shellfish. If you do not eat around three portions of oily fish every week or are prone to dry skin, then supplement with at least 1,000mg omega-3 daily from a fish oil or vegan marine-algae source rich in the EPA form of omega-3. Women who are very depleted in omega-3 may benefit from up to 3,000mg daily for the first three months.

Vitamin D

Every single cell in the body and brain has a vitamin D receptor and this nutrient is vital for sustaining good mental health. Unfortunately, reduced oestrogen in midlife makes your body less efficient at synthesising and absorbing vitamin D, and this may be one of the reasons why a vitamin D deficiency is very common in midlife women. Vitamin D supports serotonin production and dopamine regulation, so it is a vital nutritional hero when it comes to mid-life mood regulation.

In the spring and summer time, seek out at least 20 minutes of sunshine every day (before putting on your SPF makeup or sunscreen), and I recommend supplementing with D3 if you spend a lot of time indoors or if you have dark skin. If you are living in the UK, it is especially vital to supplement during the darker autumn and winter months.

Ashwagandha

Ashwagandha is an adaptogenic herb that works by moderating your Hypothalamic-Pituitary-Adrenal (HPA) axis, your body’s central stress response system, and it has been shown to lower morning cortisol levels. Many women take it before bedtime, especially if their heightened fight or flight state wakes them up in the night. If you are part of the 4am wide awake club, then Ashwagandha might well become your friend.

Most women taking Ashwagandha respond well to 300 to 600 mg per day if they are experiencing generalised anxiety. It is worth noting that ashwagandha can sometimes raise up thyroid hormones, so it’s not suitable for women with hyperthyroidism (an overactive or fast thyroid function).

L-theanine

This amino acid, found naturally in green tea and matcha, promotes calm alertness without any drowsiness. It crosses the blood-brain barrier within 30 minutes of taking it, and it also boosts GABA activity while increasing alpha brainwaves, the kind which are associated with relaxed focus.

200 to 400 mg per day of theanine as a supplement or drinking a good quality matcha tea, can help to reduce stress and anxiety. It’s gentle, non-sedating, and a lovely option for taking the edge off when you are feeling shaky.

Saffron

Saffron works by increasing the serotonin availability in the brain, and it also regulates your dopamine and adrenaline pathways. Many women find it really helpful when they have a generalised heightened fight-flight-freeze response, when things are exacerbated in the lead up to their period and for generalised anxiety and struggling to get to sleep.

You can add saffron to paella, lattes and cookies or take it as a saffron stigma extract supplement, at around 30 mg daily.

The gut microbiome link

During the perimenopause, fluctuating oestrogen disrupts what scientists call the “estrobolome,” the collection of gut bacteria responsible for metabolising oestrogen, and this can shift the balance of your entire microbiome in ways that reduce the production of calming neurotransmitters like GABA and serotonin. Lactobacilli and Bifidobacterium are the building blocks for GABA, and Escherichia, Streptococcus, and Enterococcus species produce serotonin.

The research in this area of the gut-brain-hormone axis is moving quickly. A 2025 systematic review and meta-analysis of randomised controlled trials found that women who received gut-targeted interventions such as live bacteria supplements experienced a significant reduction in both depression and anxiety symptoms during hormonal transitions, including menopause. And an exploratory RCT published in 2025 gave women aged 45 to 65 a daily probiotic for four months and found meaningful improvements in both their wellbeing and their anxiety scores.

Specific strains that show promise include Lactobacillus helveticus and Bifidobacterium longum, both of which have been shown in clinical trials to reduce anxiety and improve stress resilience.

However, just as vital is supporting your gut through fermented foods like kefir, sauerkraut, and live yoghurt, alongside a diverse fibre-rich diet, which is one of the most powerful things you can do for your mood and mental health during the perimenopausal years.

Round Up

If anxiety has become an unwelcome companion for you and you can’t quite work out why, then the perimenopause could well be the missing piece in your puzzle. The hormonal shifts behind it are real, well-documented and can be responsive to targeted nutritional support if you have the nutritional know-how.

Every woman’s experience of perimenopause is unique, so if you’d like personalised guidance on which nutrients and herbs are right for you or you would like to carry out a full review of your hormones, get in touch with our NatureDoc clinical team. We can work together with you to run comprehensive hormone testing panels and develop a tailored plan that supports your hormonal transition and helps you feel like yourself again.

Ask me what supplements can help… or anything else!

Anxiety out of nowhere? It might not be stress, it could be the Perimenopause