Hormone by Hormone: What's Declining and What Actually Helps Perimenopause

Hormones in Perimenopause - What's Declining and What Actually Helps: Perimenopause is often talked about as one big hormonal event, but it isn't.

It's several hormones moving at different speeds, for different reasons, over what is often called the "second puberty": a two-to-ten-year (sometimes longer) transition, not a single switch that flips.

Understanding which hormone is doing what, and when, is what makes targeted nutrient and herbal support actually useful, rather than a scattergun of supplements.

Below is a hormone-by-hormone breakdown. (Note: this is general education, not personalised advice; always work with a qualified practitioner before starting new supplements, especially alongside medication or existing health conditions.)

Progesterone:

Usually the first hormone to decline, often years before oestrogen drops. Ovulation becomes less consistent, and because progesterone is only made after ovulation, fewer ovulations means less progesterone, even while oestrogen is still being produced (and can spike higher than in a woman's twenties).

This mismatch is the "oestrogen dominance" pattern so many perimenopausal women experience: heavier periods, worse PMS, disrupted sleep, and new-onset anxiety.

Progesterone also converts into a calming brain metabolite (allopregnanolone), which is part of why its decline can hit sleep and the nervous system so hard.

What supports Progesterone?

• Magnesium - helps calm the central nervous system and has been shown to support the body's response to fluctuating hormones during this transition

• Taurine - works alongside magnesium to support calm, sleep, and reduce hot flush frequency

• Vitamin B6 - supportive of progesterone synthesis and often included in luteal-phase protocols

Medicinal herbs:

• Vitex (chaste tree, Vitex agnus-castus) - a traditional herbal ally used to support the body's own progesterone production via effects on the pituitary; most relevant in the earlier, still-cycling stages of perimenopause, and less useful once cycles become very irregular or stop

• White peony (Paeonia lactiflora) - traditionally paired with vitex in cycle-balancing formulas, often used alongside liquorice

• Shatavari (Asparagus racemosus) - an Ayurvedic tonic herb traditionally used to support the female reproductive and hormonal system through hormonal transitions

Oestrogen:

Not simply "low" - often erratic. This is where perimenopause differs from menopause. Rather than a steady decline, oestrogen tends to swing, sometimes climbing well above typical reproductive-year levels before eventually falling. A natural clinical approach leans heavily on supporting the clearance of oestrogen through the liver and gut, so that fluctuations are smoother rather than sharp.

What supports Oestrogen?

• Fibre (aim for 25g+ daily) - binds used oestrogen in the gut so it's excreted rather than reabsorbed; found in flaxseed, chia, oats, legumes, and pears

• Cruciferous vegetables (broccoli, kale, cabbage, Brussels sprouts) - provide indole-3-carbinol and sulforaphane, which support the liver's phase II detoxification pathways involved in oestrogen clearance

• B vitamins - particularly B6, B9, and B12, which support the liver's methylation pathway, another route of oestrogen clearance

Medicinal herbs:

• Black cohosh (Actaea/Cimicifuga racemosa) - one of the most researched herbs for hot flushes and night sweats, thought to act on temperature regulation via serotonin pathways rather than directly on oestrogen

• Red clover (Trifolium pratense) - a phytoestrogen-rich herb used to gently buffer receptor activity during fluctuating oestrogen; effects on hot flushes are modest but reasonably well studied

• Sage (Salvia officinalis) - traditionally and clinically used specifically for excessive sweating and hot flushes

• Dong quai (Angelica sinensis) - a traditional Chinese herb used for menstrual regulation and uterine support, generally used in combination formulas rather than alone

Testosterone:

Often overlooked, Testosterone declines gradually across the whole perimenopausal window, and its loss is under-discussed compared to oestrogen and progesterone.

Low testosterone is linked with reduced libido, low motivation, and loss of muscle tone; but note that relative androgen excess (testosterone remaining more dominant as oestrogen and progesterone fall away faster) can show up as acne, hair thinning, and abdominal weight gain, so this hormone needs individual assessment rather than a blanket "more is better" approach.

What supports Testosterone?

• Zinc - a cofactor in healthy androgen production and metabolism

• Adequate protein and resistance exercise - not a supplement, but foundational to maintaining testosterone-supported muscle mass through this stage

Medicinal herbs:

• Maca root (Lepidium meyenii) - traditionally used to support energy, libido, and hormonal resilience during this transition (works on the adaptogenic/endocrine-signalling level rather than directly supplying hormones)

• Tribulus (Tribulus terrestris) — a traditional libido and vitality herb, though human evidence for a direct testosterone effect is mixed and it's generally used more for its effect on desire and energy

Cortisol and the HPA axis: Why stress hits differently in your 40s

This is a genuinely under-appreciated piece of the puzzle: progesterone helps stabilise the HPA (adrenal) stress axis. As progesterone drops, that stabilising effect weakens, which is a big part of why so many women notice they suddenly can't "shake off" stress the way they used to, and why anxiety and insomnia often show up for the first time in perimenopause rather than being purely psychological.

What supports Cortisol?

• Magnesium - again central here, supporting GABA (the brain's calming neurotransmitter)

• Vitamin B5 (pantothenic acid) and vitamin C - both used up more quickly during periods of higher physiological stress, and support adrenal hormone output

• L-theanine or taurine - calming amino acids often paired with magnesium in evening protocols

• Breathwork, Moving, Sunlight, Nature - see blog here https://www.nourishebotanicals.co.nz/post/nervous-system-regulation-simple-ways-to-help-your-body-feel-safe-again

Medicinal herbs:

• Ashwagandha (Withania somnifera) - an adaptogen used to help the nervous system regulate its stress response, lower perceived stress, and support sleep

• Rhodiola (Rhodiola rosea) - an adaptogen more suited to daytime fatigue and low resilience under stress than to evening calming

• Siberian ginseng/eleuthero (Eleutherococcus senticosus) - traditionally used to support stamina and resilience during prolonged stress

• Holy basil/tulsi (Ocimum sanctum) - used to support a calmer stress response and healthy cortisol rhythm

• Chamomile and passionflower - gentler nervine herbs often combined with the above for anxiety and sleep support

Thyroid: the hormone that likes to hide behind the others

Thyroid dysfunction becomes markedly more common in the 40s and 50s, and its symptoms;

fatigue, weight changes, brain fog, mood changes, temperature dysregulation, often overlap so heavily with perimenopause that one is frequently misattributed to the other.

This is why thorough naturopathic assessment typically includes a full thyroid panel rather than assuming symptoms are "just hormones."

What supports Thyroid Function?

• Selenium - required to convert inactive thyroid hormone (T4) into its active form (T3)

• Iodine - a core building block of thyroid hormone, needed in the right (not excessive) amount

• Zinc and iron - both required for healthy thyroid hormone production and conversion

• Tyrosine - the amino acid backbone thyroid hormone is built from

Medicinal herbs:

• Ashwagandha - beyond its adrenal role, some research suggests a supportive effect on thyroid hormone levels, likely partly via its cortisol-lowering action, so it's a common bridge herb between the adrenal and thyroid sections

• Coleus / forskohlii (Coleus forskohlii) - used to support healthy thyroid hormone signalling

• Bugleweed (Lycopus virginicus) and lemon balm (Melissa officinalis) - the reverse case: these are used specifically for an overactive thyroid, to gently dampen excess hormone activity. Important not to use these unless overactivity is confirmed, since they work in the opposite direction to the herbs above.

All herbs should be prescribed by a knowledgeable practitioner, but Thyroid herbs do require proper testing rather than self-selecting if strongly advised.

Melatonin: the sleep hormone that quietly fades

Melatonin is the hormone that tells your body it's night. Its production naturally declines with age in everyone, regardless of hormone status, but perimenopause adds further disruption on top.

Falling progesterone makes it harder for the nervous system to wind down, and hot flushes and night sweats can wake you partway through the night, breaking up the sleep-wake rhythm that melatonin is meant to keep steady. The result is the familiar "tired but wired" pattern, with waking in the small hours and struggling to get back to sleep.

Melatonin itself is tightly regulated in New Zealand: some pharmacy-only options exist for adults 55 and over with short-term insomnia, but it is prescription-only for most other uses. For that reason the focus here is on supporting your body's own melatonin production, rather than taking it directly.

What supports it:

• Tryptophan-rich foods (turkey, eggs, oats, pumpkin seeds) - the raw material your body uses to make serotonin, which is then converted into melatonin

• Vitamin B6 - a cofactor in the conversion of tryptophan to serotonin and melatonin

• Magnesium (glycinate is a gentler form) - supports GABA, the brain's calming neurotransmitter, helping the body wind down at night

• Tart cherry - naturally contains melatonin and tryptophan, and small studies suggest improvements in sleep duration and quality

• Morning light and a dark, cool bedroom - not a supplement, but foundational to a healthy melatonin rhythm

Medicinal herbs:

• Valerian (Valeriana officinalis) - a traditional sleep herb, though research results are mixed, so it's worth trialling to see whether it suits you

• Ashwagandha (Withania somnifera) - most helpful where poor sleep is clearly stress-driven, by supporting a calmer cortisol response

• Passionflower (Passiflora incarnata) and chamomile (Matricaria chamomilla) - gentler nervine herbs used to settle a busy mind before bed

Valerian and other sedating herbs can interact with sleep medications, sedatives and alcohol, which is another reason to check with your practitioner first. If poor sleep is persistent, it's also worth having it properly assessed rather than assuming it's hormonal.

Insulin and blood sugar: why your metabolism seems to change

Insulin isn't a sex hormone, but it is closely tied to the ones that are changing. Many women notice that the way their body handles food shifts in perimenopause: afternoon energy crashes, shakiness or brain fog after meals, strong cravings for fast-absorbing carbohydrates, waking at 3am feeling alert or hungry, and weight gathering around the middle even when nothing about their diet has changed. It is easy to blame willpower, but hormones are a large part of the picture.

Oestrogen helps cells respond to insulin, so when it swings and eventually falls, cells may become less responsive, and the body has to release more insulin to keep blood sugar steady. Falling progesterone is also increases insulin resistance, and fluctuating progesterone can make blood sugar less predictable from week to week. Cortisol adds to this, because it raises blood glucose, and poor sleep (including sleep broken by night sweats) can push insulin sensitivity down further, a cycle that can reinforce itself night after night. Over time, insulin resistance also encourages fat to be stored around the abdomen.

Perimenopause does not cause diabetes, but these shifts may raise the risk of type 2 diabetes over time, which is why blood sugar is worth paying attention to. Full symptom picture matters as much as a single fasting result.

What supports it:

• Protein at breakfast (around 20–30 g) - helps steady blood sugar and reduce hunger through the day

• Fibre and low-glycaemic whole foods - vegetables, legumes, whole grains and lean protein slow the rise in blood glucose after meals, while ultra-processed foods and added sugars (including those hidden in flavoured yoghurts) do the opposite

• Magnesium - involved in energy and glucose metabolism; some research suggests it may improve insulin sensitivity in people at higher risk of type 2 diabetes, although results are inconsistent

• Inositol - supports insulin sensitivity, and is best studied in women with PCOS

• Choline, taurine and glycine - three nutrients commonly under-eaten, supporting liver function, cellular energy production and the nervous system

• Resistance training and daily movement - not a supplement, but regular activity improves insulin sensitivity and helps maintain the muscle that keeps your metabolism responsive

Medicinal herbs:

• Berberine (a plant compound found in herbs such as barberry, Berberis vulgaris) - reviews suggest benefits for blood glucose and insulin resistance.

• Cinnamon (Cinnamomum species) - some reviews found modest reductions in fasting glucose and insulin resistance, although studies vary.

• Fenugreek (Trigonella foenum-graecum) - traditionally used to support healthy blood sugar, although research is limited and hasn't proven it effective

  
  

Any herb or supplement that influences blood sugar can add to the effect of diabetes medication and increase the risk of low blood sugar, so let your GP or practitioner know about everything you take, and never use these in place of medical treatment. Women who already have diabetes may also find that perimenopausal hormone shifts make their blood sugar harder to predict and their medication needs change, so closer monitoring is worthwhile.

The bigger picture:

None of these hormones decline in isolation, which is exactly why naturopaths assess the whole hormonal picture, often alongside cycle charting, symptom timelines, and functional testing rather than treating symptoms one at a time.

Nutrient and herbal support can meaningfully ease this transition, but they work best as part of an individualised plan rather than a generic supplement stack. This article is for general education only and isn't a substitute for personalised medical or naturopathic advice. Always consult a qualified healthcare provider before starting new supplements or herbal medicines, particularly if you're on medication, pregnant, breastfeeding, or managing an existing health condition.

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