Perimenopause in Your 40s: A NZ GP’s Guide for Kiwi Women
By Dr Roderick Mulgan, NZ GP and founder of Lifeguard Health.
If you’re a NZ woman in your early 40s and something feels off — sleep less reliable, mood a bit shorter-fused, periods less predictable, energy patchy — this is for you. Perimenopause often arrives quietly, before anyone has formally said the word, and it can rattle on for years before menopause itself.
What perimenopause is (and isn’t)
Perimenopause is the run-up to menopause — the years during which your ovaries gradually wind down. For most NZ women it begins in the early-to-mid 40s. Hormone levels (oestrogen and progesterone in particular) start to fluctuate, sometimes wildly, and the symptoms reflect that fluctuation rather than a steady decline.
That’s an important point: in perimenopause, hormones don’t simply drop. They lurch. That’s why a woman in her early 40s can have a textbook month followed by a month where everything feels off, then a month somewhere in between.
Menopause itself is the point at which you’ve gone 12 months without a period. In NZ the average age is around 51. Everything in the years leading up to that — sometimes 8–10 years of it — is perimenopause.
The signs to take seriously
Some of the most common perimenopause symptoms I see in my NZ general practice, particularly in women in their early-to-mid 40s:
- Periods becoming heavier, lighter, longer, shorter, or unpredictable
- Disrupted sleep — waking at 2–3 am with a busy mind
- Hot flushes and night sweats (yes, these can start years before periods stop)
- Mood changes, particularly irritability and a shorter fuse
- Anxiety that doesn’t feel like “you”
- Brain fog, missing names, forgetting why you walked into the kitchen
- Joint aches, especially in the mornings
- Lower libido
- Weight changing distribution, particularly around the middle
You don’t need all of these for it to be perimenopause. You don’t need any of these to be “significant” in a textbook sense. If your life has shifted and the timing fits, the timing fits.
What actually helps
The honest answer is: a combination of things, in this rough order.
1. Sleep
If sleep collapses, everything else gets harder. Protect a regular bedtime, get morning light, watch alcohol (which fragments sleep more in your 40s than it did in your 30s), and consider a melatonin-free sleep supplement. Melatonin is prescription-only in NZ, so a non-prescription nightly product like Lifeguard Sleep is often the practical answer.
2. A daily nutritional foundation
Don’t try to fix perimenopause with a cupboard full of supplements. Pick one good daily foundation that covers vitamin D, B-vitamins, magnesium and omega-3 — the everyday nutrients NZ adults 45+ are most often running short on. That’s the philosophy behind Lifeguard Essentials.
3. Strength training
Two to three sessions a week of resistance training is the single most useful intervention for bone density, muscle preservation, glucose handling and mood in perimenopausal women. You don’t need a gym — bodyweight, bands, and a couple of dumbbells will do.
4. A frank conversation with your GP about HRT
If hot flushes, sleep or mood are significantly affecting your life, HRT (often called MHT — menopausal hormone therapy) is worth a properly informed conversation. The 2002 WHI study scared a generation of women off HRT; the picture in 2026 is much more nuanced, and for many women in their 40s and early 50s the risk profile is favourable. Talk to a NZ GP who keeps up with menopause care.
5. Don’t skip the basics
Iron is commonly low in perimenopausal women with heavy periods — ask for a blood test if you’re tired, breathless on stairs, or pale. Thyroid problems also become more common in this age group, and they look a lot like perimenopause. Get the obvious things ruled out.
What I’d be wary of
Any product that promises to “balance your hormones”, “reverse perimenopause” or replace medical advice. Be cautious of bioidentical-hormone compounding clinics that operate outside mainstream care. Be cautious of expensive bespoke supplement protocols that aren’t supported by evidence. And be cautious of anyone telling you perimenopause is something you should just push through.
Frequently asked questions
When does perimenopause start in NZ women?
Most commonly in the early-to-mid 40s. Some women start earlier, in their late 30s, particularly if their mother went through menopause early.
How long does perimenopause last?
Anywhere from a few years to a decade. The average is around 4–7 years.
Can I get a blood test to confirm perimenopause?
Hormone blood tests can be unhelpful in perimenopause because levels fluctuate so much. NZ guidelines generally don’t recommend FSH or oestrogen testing to diagnose perimenopause in women over 45 — symptoms are the diagnosis.
What supplements help with perimenopause?
A daily multi-nutrient foundation covering vitamin D, B-vitamins, magnesium and omega-3 is sensible. Specific support for sleep (without melatonin) is often the next priority. See our NZ GP’s guide to menopause supplements for the full picture.
Should I just take HRT?
HRT is worth considering for many women, especially if symptoms are significantly affecting your life. It’s not the right call for everyone — have the conversation with a NZ GP who knows menopause well, weigh the personal pros and cons, and make a decision from there. Supplements and HRT aren’t mutually exclusive.
If you take one thing from this article
You don’t need to white-knuckle perimenopause. The combination of sensible daily nutrition, protected sleep, strength training, and an informed conversation with your GP will get most NZ women in their 40s through this transition in much better shape than soldiering on alone.
Read the full NZ guide to menopause supplements →
Or take our 60-second quiz for a simple, personalised suggestion.
This article is general information for NZ adults 45+ and is not a substitute for personal medical advice. If you’re unsure what’s right for you, speak to your GP. Dr Roderick Mulgan is a NZ general practitioner and the founder of Lifeguard Health.
