Magnesium and Perimenopause: Why the Form You Take Matters
If you've been anywhere near perimenopause advice in the last few years, someone has told you to take magnesium. A friend, a podcast, your GP, an algorithm that worked out what decade you're in.
So you bought some. You took it for a fortnight. And not a lot happened, except possibly a more urgent relationship with your bathroom than you'd bargained for.
Here's the thing almost nobody explains. That probably wasn't magnesium failing you. It was the form of magnesium.
Why magnesium comes up so often in perimenopause
Magnesium is involved in hundreds of processes in the body. Muscle function, nervous system regulation, blood sugar handling, bone maintenance, and the way your body uses vitamin D all rely on it.
Perimenopause makes it more relevant for a few overlapping reasons.
Fluctuating oestrogen affects sleep and mood regulation, which is exactly the territory magnesium plays in. Bone density becomes a bigger deal as oestrogen drops, and magnesium is part of that picture alongside calcium and vitamin D. And the things that tend to increase in this stage of life, stress, broken sleep, more coffee to survive the broken sleep, and a glass of wine to take the edge off, all nudge magnesium out of the body faster.
Meanwhile, a meaningful chunk of Australian women don't reach the recommended intake from food alone. The Australian recommended dietary intake for women over 31 is 320mg a day. That's achievable through diet, but it takes deliberate eating, and most of us aren't getting through a daily bowl of pumpkin seeds and silverbeet.
The bit nobody tells you: magnesium is never just magnesium
Magnesium is a mineral, and in its pure form it's too reactive to sit in a tablet. It has to be bound to something else to be stable.
That something else is the whole ballgame. It determines how much magnesium your body can actually absorb and use, and how your gut feels about the arrangement.
This is why the number on the front of the bottle tells you close to nothing. A tablet advertising 500mg of magnesium in a form your body can't absorb is worth less to you than a smaller dose in a form it can.
The main forms, and what they're actually like
Magnesium oxide
The one in most cheap supermarket tablets, and the reason a lot of women think magnesium did nothing for them.
Oxide is high in elemental magnesium and very cheap to produce, which is why the label numbers look so impressive. The problem is absorption. Studies put the bioavailability of magnesium oxide at a small fraction of what you swallow.
Worse, the portion your body doesn't absorb stays in the digestive tract and draws water into the bowel. That's not a side effect exactly, it's how magnesium oxide works as a laxative, which is a legitimate use for it. It's just not what you were after when you were trying to sleep through the night.
Magnesium citrate
Magnesium bound to citric acid. A genuine step up on oxide for absorption, and widely available.
Still on the enthusiastic side digestively for a lot of people, particularly at higher doses. Also commonly used as a laxative, which tells you something.
Magnesium glycinate (also called bisglycinate)
Magnesium bound to glycine, an amino acid.
This form is well absorbed and notably gentle on the gut, which matters enormously if you're taking it every single day rather than occasionally. Glycine itself is a calming amino acid involved in nervous system function, so the carrier isn't just inert packaging.
The trade-off is cost. Glycinate is more expensive to formulate with, and because glycine takes up space in the molecule, the elemental magnesium percentage is lower than oxide. You need a bigger physical amount to deliver the same magnesium, which is why you rarely see it in the budget tablets.
Magnesium L-threonate
The newest and priciest of the bunch, studied for its ability to cross the blood-brain barrier, usually marketed around focus and cognition. Interesting research, small evidence base so far, and expensive.
Magnesium sulfate (Epsom salts)
Lovely bath. The evidence that meaningful amounts of magnesium absorb through skin is thin. Enjoy it for the bath, not as your magnesium strategy.
Why we chose glycinate
When we were formulating the SheBANG! superlattes, this was one of the first arguments we had, and Ange, who is the clinical nutritionist half of this business, won it comfortably.
The logic was straightforward. This is a product designed to be drunk every day, indefinitely, by women who are already dealing with enough. A form that upsets your stomach isn't a daily ritual, it's a bottle in the back of the cupboard.
So every SheBANG! superlatte contains 150mg of magnesium glycinate per serve. That's roughly half your recommended daily intake, in a cup, and it helps manage sleep, mood, night sweats and hot flushes.
It's the same amount in every flavour. The Rose, the Chai, the Salted Caramel, the Strawberry Matcha and the Hot Choccy differ in taste and in what else is in them, not in the magnesium. Pick the one you like drinking, because the one you like drinking is the one you'll actually finish.
How much do you need, and can you get it from food?
The Australian RDI is 320mg a day for women over 31, and 310mg for women aged 19 to 30.
Food-wise, the best sources are pumpkin seeds, almonds, cashews, dark leafy greens like spinach and silverbeet, legumes, wholegrains and dark chocolate. Yes, dark chocolate genuinely counts, though not at the quantity that would make it a strategy.
Most people are better off treating food as the foundation and topping up, rather than relying on either one alone.
When should you take it?
Magnesium glycinate is well tolerated at any time of day, so this is mostly about what you'll remember.
A lot of our customers drink theirs in the evening because a warm mug is a decent wind-down cue on its own, and the ritual becomes part of the signal to stop. Others have it mid-afternoon when the slump lands. The Strawberry Matcha is the exception, as it contains caffeine, so that one's a morning drink.
The best time is whenever you'll do it consistently. Consistency beats optimisation every time here.
How long before you notice anything?
Longer than you'd like, and this is the part most brands go quiet about.
Magnesium isn't a painkiller. It's not doing something dramatic within twenty minutes. It's replenishing a mineral your body uses constantly, and if you've been running low for a while, filling that back up takes time.
Most of the women who tell us they've noticed a real difference are describing something that emerged over weeks, not days. The ones who report the biggest shift are the ones who kept going for months. Nine in ten of our customers tell us they feel a difference, and almost none of them got there from a single bag.
If you're going to try magnesium, give it a proper run. A fortnight isn't a test.
A few cautions
Magnesium can interfere with the absorption of some medications, including certain antibiotics, thyroid medication and bone medications. Usually it's a matter of spacing them a few hours apart, but check with your GP or pharmacist rather than guessing.
If you have kidney disease, talk to your doctor before taking supplemental magnesium, as your body's ability to clear the excess may be affected.
And magnesium is one part of a picture, not the whole of it. If your sleep, mood or cycle changes are significantly affecting your life, that's a conversation worth having with a GP who takes perimenopause seriously. A daily mug is a good habit, not a substitute for care.
The short version
The form matters more than the number on the front of the bottle.
Oxide is cheap and poorly absorbed. Citrate is better but can be rough on the gut. Glycinate is well absorbed, gentle enough for daily use, and costs more to make, which is exactly why it's less common and exactly why we use it.
If you tried magnesium once and concluded it wasn't for you, it's worth knowing you may simply have tried the wrong one.
Every SheBANG! superlatte contains 150mg of magnesium glycinate plus collagen peptides, formulated in Australia by a clinical nutritionist for women in perimenopause and menopause.