For the 3am wake-up that started in perimenopause.
Magnesium has more clinical sleep evidence than almost any other supplement you can buy without a prescription.
Three controlled trials · 17 minutes faster to sleep.
60 servings. Less than $0.94 per night
- 60-day money-back guarantee
- Third-party tested
- Next-day Auckland dispatch
It started with the sleep. Then everything else shifted.
Brain firing, body running hot, lying still in the dark. By 5am you've made a list of everything you forgot last week.
By 7am you're up, tired in a way coffee doesn't touch, deciding which of today's meetings you can fake your way through.
Most GPs will tell you it's stress. It isn't.
You are not imagining it. You are not doing something wrong.
One specific thing is happening in your body, and one of those symptoms has an answer backed by more clinical evidence than almost anything else you can buy without a prescription.
Oestrogen doesn't
fall. It crashes around.
For most women, the worst sleep happens in perimenopause, when oestrogen swings unpredictably from week to week. That's why your symptoms feel erratic. They are.
This is not stress. It's not a sleep hygiene problem. It's a neurochemical shift, and it doesn't reverse on its own.
Magnesium is how your body brakes.
It supports GABA signaling, the calming system your brain uses to wind down. It also helps regulate cortisol, the stress hormone that's supposed to drop at night but doesn't reliably drop anymore.
But for the sleep part, the clinical evidence is unusually specific.
What the trials actually found.
Three randomised controlled trials. Older adults with insomnia. Daily magnesium or placebo.
People taking magnesium fell asleep about 17 minutes faster than people taking a placebo.
That sounds small until you're the one lying awake. Over a week, it's almost two hours of sleep you didn't used to get.
Mah & Pitre, 2021. BMC Complementary Medicine & Therapies.
500mg magnesium daily, 8 weeks.
In older adults with insomnia, magnesium supplementation produced significant improvements in four sleep markers at once: faster sleep onset, reduced insomnia severity, higher melatonin, lower cortisol.
A recent chelated magnesium trial.
A 2025 trial using a chelated form of magnesium (bisglycinate) showed a modest but statistically significant improvement in insomnia scores. Biosphere uses a different chelate (lysinate glycinate) in the same family.
If you've tried magnesium
before and it didn't help.
The trials that moved sleep markers used 300 to 500mg of elemental magnesium a day. Most chemist magnesium is 150 to 250mg. A lower dose isn't a smaller version of the same effect. It's often below the threshold where any effect shows up at all.
Form matters too. Magnesium oxide, the cheapest and most common form, showed no difference from placebo in a randomised double-blind trial. Chelated forms (the kind bound to an amino acid) and citrate both raised blood magnesium meaningfully.
Real comments. Real people. Unprompted.
New Zealand's most reviewed magnesium • 150+ stores nationwide
60-Day Money Back Guarantee
If you don't feel a difference, you get every dollar back. No forms. No questions asked. Just email us.
Three bioavailable magnesium forms at the dose that actually works.
Less than $0.94 per night. Two months supply
Choose your flavour:
- Third-party tested every batch
- Naturally sweetened with monk fruit and stevia
- Vegan, gluten-free, no allergens
Next-day Auckland dispatch
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New Zealand's most reviewed magnesium · 150+ stores nationwide
Customer Reviews
Overall rating: 4.8 / 5 from 1620 reviews.
Astaxanthin is vital for us all in this aging process. Every blessing we can get for all round health and optimal function is a bonus. We are grateful for the bioavailable source. Regards Steve and Fiona
I have tried many supplements over the years. Some I’ve stopped using because I didn’t notice a difference. I Will always aim to keep astaxanthin as part of my stack. I have noticed such an amazing change in my skin. My skin has always been good, but this has taken it to another level. I love this product! I particularly love the Biosphere brand as they use olive oil in the capsules, rather than seed oils. Really happy to support this NZ company.
Great product, I have been using it to help my eyes feel more comfortable ( post menopause) , they are definitely less scratchy than they were! I can’t wait to try the magnesium yet, it looks really good.
We both have the best sleep usimg this product. I am about to put in another order.
Lovely flavour and works really well.
I rely on 'Sleep' to help my sleep. Its a vial part of my evening ritual. I notice when I dont take it
Great for dry eyes. Best I've tried
Take this every night for restless legs and sleep . Alternate between the 2 flavours
Very good product but I did have to adapt it. I found taking it just before bed it would give me a hit of energy. So I no take it with dinner or just after around 7 and it gives my body time to process the ashwaganda. I still do have trouble sleeping but I do feel the nights I do sleep it’s a deeper sleep. I am going through a lot of stress and biological changes but I do feel it has helped just not as much as I hoped. The flavour is delicious and the customer service was awesome. I’m going to try the plain magnesium next time as I think ashwagandha not well suited to me
Great product - slept soundly :)
Love this product, after my first month I have far more mobility, energy and stamina, will be purchasing more...
I haven't gotten my very first bottle yet, but I will be ordering more. Capsules are easy to swallow, and makes it easy that need to take with food . Easy to remember with breakfast
On my second month of astaxanthin, not much change except a little more energy generally. Will give it a full three months.
I am so happy with my Astaxanthin . Can’t believe that it has worked so quick at pain relief . I have tried lots of other products in many years and I think this is the best thing I have tried . I have no pain and it so good . I hope this keeps up I have arthritis and and a few joint replacements so always in pain . Thank you
Awesome flavour magnesium for a massive day in the mountains!!!
Both flavours are nice and the powder mixes well. No longer getting night time cramps, so very happy with this. Will definitely be continuing with this product.
Awesome product.
I've been taking Biosphere Nitric Oxide for just over 5 weeks now. Before I started my blood pressure was in the 140s/150s/ 90s. This month I have only had one spike and my daily readings are consistently lower with some now in the ideal or normal range. I am really pleased with this result so far.
Ive been taking these now for a little over a month an just love the way my skin feels, an how its helped me not getting any flu this winter . As a shift worker doing 12 hr shifts I think its really been a great help getting me thru the day. I highly recommend them.
This magnesium is almost magic, I have had hip pain for several years and 5 weeks in it had totally gone. Unfortunately its a little hard on my stomach so have had to cut down the dose to half, I can just feel my hip pain a little again with the half dose. I will try supplementing the half dose with Astaxanthin next order.
I was getting regular muscle cramps at night and in the 30 days I trialled Biosphere Magnesium I only got a cramp once or twice. Since then I tried another brand of magnesium but haven't had the same success. Mixes easily and the lemon-lime flavour I tried us pleasant to drink.
I’ve been taking Bio sphere Nitric Oxide for a couple of years now as part of my supplement protocols. I workout at the gym and also do a lot of breathwork and this compliments everything I do.
It tastes good, easy to use, and I've halved my blood pressure tablet. It seems to be working for me and I intend to remove the blood pressure tablet totally in a week or so. It's coming on holiday with me!
Take it with my morning decaf that has coconut milk - so I am taking 2 capsules with some fats. Recently had people commenting on how nice my skin is looking. I am 60yo and recovering from cancer treatment.
Really happy with the magnesium powder, mixes well, tastes great and is now part of my daily routine.
Perfect start to my day…great flavour and definitely an improvement showing in my blood pressure levels!
The lemon/lime Magnesium powder is delicious and refreshing. It certainly is helping reduce cramps and helps me get to sleep quickly and sleep for longer periods.
I take magnesium after the gym to help with cramp.
Onto my first jar and already have a back up ready to go. Tastes delicious . Even bought a new bottle to use .
My husband is slowly reducing his blood pressure medication by using Nitric Oxide. Blood pressure is finally reducing
Been taking Astaxanthin for about 6 weeks now and definitely notice my eye and skin health is better, also seem to have a bit more energy.
A nightly routine, super power sleep when I take the magnesium - such a distinctly better sleep than nights I don’t take it.
I’ve recently changed to Biosphere Magnesium and will be reordering. It is so easy to take and adjust the amount as needed. I particularly like the Mango Pineapple flavour and take it just before bed to stop leg cramps.
Great product
I have this in the morning. Great tasting and refreshing. Great start to the day
I have found this the only product, after many years of finding something to help my sleep. My sleep for past 13 years been erratic due to menopause and hectic life. I have used this for a month now with only a couple of bad nights sleep. I sleep through until 5.00am. Hallelujah. Thank you Biosphere. Great product. Also just started using your hydrate supplement. I'll see how that goes over next month too.
I've been forgetting to wear my prescription glasses, it's been 3 months. My hair is a little darker, my nails are stronger and my skin has a summery glow. Hoping for some relief to my joints....
Easy to take and Good value for money!
The longer I take these the better I have been feeling
I started using astaxanthin on 13 May 2026. I live with chronic inflammation that often leads to headaches and migraines, and since beginning the supplement I’ve noticed a meaningful shift. My baseline inflammation feels lower, and the frequency and intensity of my headaches and migraines have reduced. Another unexpected change has been with my eye floaters. They used to be a daily nuisance, but over the past weeks they’ve improved noticeably. This is simply my personal experience and not a medical conclusion. Yet the changes have been significant enough for me to share.
60 Nights to Decide
Try Biosphere Magnesium for 60 nights. If your sleep hasn't changed, email us. We'll refund you in full. No forms, no returns.
- Full refund within 48 hours of your email
- No questions asked
- Keep the tub either way
- 60-night money-back guarantee
- Third-party tested
- Next-day Auckland dispatch
Before You Order
Will this actually help if my main issue is menopause, not just sleep?
Magnesium works on two of the sleep systems oestrogen disrupts: GABA signaling and cortisol rhythm. It doesn't fix hot flushes or reverse menopause. What it does is give you back the body chemistry that lets you wind down and stay asleep. For the sleep part, that's where the strongest evidence sits.
How long before I notice anything?
Most women notice shifts within one to two weeks. Full effect builds over about four weeks. The clinical trial we cite used daily magnesium for eight weeks. If nothing has changed by week four, the 60-night guarantee has you covered.
Can I take this with HRT, sleep medication, or antidepressants?
Check with your GP before combining any supplement with prescription medication, including HRT. Magnesium is generally well-tolerated alongside most prescriptions, but your doctor knows your full picture. Standard advice, not a red flag about the product.
Will it make me groggy in the morning?
No. Magnesium isn't a sedative. It supports the systems that let your body wind down on its own, so there's no next-day hangover. Different from melatonin. Very different from prescription sleep aids.
Can I take this every night, indefinitely?
Yes. Magnesium isn't habit-forming. Your body doesn't build tolerance the way it does with sleep medication, and any excess is excreted in urine. It's a mineral, not a drug, so there's no need to cycle off or take breaks. Most of our customers take it nightly for months or years. If you have kidney disease or take prescription medication, check with your GP before starting.
Menopause is the transition.
Sleep is the first thing worth getting back.
You've read the mechanism. You've seen the evidence. You know what magnesium does and what it doesn't. The only thing left is 60 nights to find out.
- 60-night money-back guarantee
- Next-day Auckland dispatch