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
For the 3am wake-up that started in perimenopause.
Three controlled trials. About 17 minutes faster to sleep. No prescription.
$56.00$69.99
One tub · 60 servings · two months
Discount applied automatically at checkout
400mg elemental per scoop
Third-party tested every batch
GMP-certified facility
Stocked in 150+ NZ stores
Sound familiar?
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.
Earlier nights. No wine. A cooler room. The sleep app. Most GPs will tell you it's stress, and offer something you don't want to take every night.
You are not imagining it. You are not doing something wrong. One specific thing is happening in your body, and the sleep part of it has an answer.
What's actually happening
Oestrogen doesn't fall. It crashes around.
In perimenopause oestrogen doesn't decline in a neat line. It swings, week to week, sometimes day to day. Your sleep tracks those swings. That's why some weeks are fine and others are a write-off, and why nothing you change seems to stick.
It's not a sleep hygiene problem. It's a chemistry shift, and it doesn't reverse on its own.
up to47%
of women in perimenopause report trouble sleeping
- Rises to as many as 60% after menopause
- Waking in the night is the most common complaint, not falling asleep
- Hot flushes make it worse, but they aren't the only cause
Baker et al., 2018. Nature and Science of Sleep.
Why magnesium
Magnesium is how your body brakes.
Oestrogen helps run the two systems that put you to sleep and keep you there. Magnesium supports both. It doesn't replace the oestrogen. It steadies what sits underneath it.
Magnesium won't reverse menopause. It won't fix every symptom.But for the sleep part, the clinical evidence is unusually specific.
The two systems involved
Oestrogen disrupts
GABA signallingThe wind-down signal. Weaker, so your brain won't switch off.
Magnesium supports
GABA activityMagnesium binds the same receptors GABA uses to calm the nervous system.
Oestrogen disrupts
Cortisol rhythmSupposed to fall at night. Stays up, so you wake wired at 3am.
Magnesium supports
Cortisol regulationIn an 8-week trial, cortisol fell and melatonin rose on 500mg a day.
Abbasi et al., 2012. Boyle et al., 2017, Nutrients.
What the trials actually found
What the trials actually found.
A 2021 pooled analysis of three randomised controlled trials. 151 older adults with insomnia, daily magnesium or placebo. The magnesium group fell asleep about 17 minutes faster.
That sounds small until you're the one lying awake. Over a week, it's close to two hours of sleep you weren't getting.
A separate eight-week trial at 500mg a day moved four markers at once: faster sleep onset, lower insomnia scores, higher melatonin, lower cortisol.
Not a vitamin-aisle promise. Controlled trials, against placebo.
Pooled analysis of randomised controlled trials, 2021
17 minutes faster to sleep
3 trials · 151 adults with insomnia · magnesium vs placebo
Time to fall asleepFaster
Insomnia severity (8-week trial)Lower
MelatoninHigher
CortisolLower
Mah & Pitre, 2021, BMC Complementary Medicine & Therapies. Abbasi et al., 2012.
Blueberry-Pomegranate
Three forms of magnesium at the dose the trials used.
60 servingsTriple-formVeganNo added sugar
$56.00$69.99Save $13.99
About $0.93 a night · 60 nights, the full guarantee window
- Lysinate glycinate chelate, citrate and malate. Three forms your body absorbs.
- One scoop in water. Naturally sweetened with monk fruit and stevia.
- Gentle on the stomach: absorbed rather than passed.
Discount applied at checkout$4.95 NZ shipping
Quick answers
- Can I take it with HRT or other medication?
- Usually yes, but check with your GP first. Standard advice, not a red flag.
- When will I notice it?
- Most women notice the evenings first, within one to two weeks. Full effect builds over about four.
- Is this a subscription?
- No. One tub, one order. Dispatched from Auckland the same or next working day.
From the reviews
What women noticed in their sleep.
Three buyers, in their own words. Unedited.
★★★★★★★★★★
"I've had major sleep difficulties since I started menopause over 15 years ago. I've tried everything on the market to help with sleep … couldn't get to sleep, stay asleep… working full time in a pressured job with 3-4 hours broken sleep a night. By the end of the week I was totally exhausted. I'm now post menopausal and still struggling to sleep. This product really helps. I'm amazed! Thank you so much!!!!"
LynVerified buyer · 13 March 2026
★★★★★★★★★★
"This is my evening routine. Magnesium helps me with my sleep from perimenopause symptoms. I noticed that my joints pain are nearly gone. The taste is so good and that's a plus."
Charisma H.Verified buyer · 14 July 2026
★★★★★★★★★★
"I think the Magnesium has made a difference to my sleep. Elemental magnesium is definitely superior to other magnesium designed for sleep and other things. I have been a shocking sleeper for years and have tried lots of things but nothing works consistently. This product has definitely helped and I feel so much better for it."
Jeanine L.Verified buyer · 12 July 2026
If you've tried magnesium before
If it didn't help, check the dose on the label.
The trials that moved sleep markers used 300 to 500mg of elemental magnesium a day. A lot of chemist magnesium is 150 to 250mg per tablet.
Form matters too. Magnesium oxide, the cheapest form, showed no difference from placebo in a randomised double-blind trial. Chelated forms (bound to an amino acid) and citrate both raised blood magnesium meaningfully.
A lower dose isn't a smaller effect. Often it's no effect at all.
Elemental magnesium per daily dose
Many chemist tabletsper tablet150mg
Stronger chemist tabletsper tablet250mg
The trials that workeddaily dose range300–500mg
Biosphereone scoop400mg
Elemental magnesium, not compound weight. Trial doses from Mah & Pitre, 2021 and Abbasi et al., 2012. Oxide vs placebo: Walker et al., 2003.
What's in every scoop.
One 4.7g scoop in water, an hour or so before bed.
400mgelemental · per scoop
The dose
Three forms, one scoop
Elemental magnesium, not the weight of the compound. No proprietary blend, no handful of capsules.
The three forms, and what each one is there for.
100mgelemental
Lysinate glycinate chelate
Bound to two amino acids so it's absorbed rather than passed. The gentle one, and the form in the chelate family the 2025 trial used.
150mgelemental
Magnesium citrate
Well absorbed. Raised blood magnesium meaningfully in the head-to-head trial that oxide failed.
150mgelemental
DiMagnesium malate
Magnesium paired with malic acid, which your cells use to make energy. For the daytime half of the problem.
Other ingredients: citric acid, natural flavours, monk fruit extract, stevia leaf extract, beta carotene and turmeric root powder for colour. Gluten-free.
Third-party tested every batch
Tested by a lab we don't own. Read the certificate yourself.
Every batch of Biosphere Magnesium goes to an independent laboratory before it's sold. The lab checks what's in the tub against what's on the label, and screens for heavy metals and microbes.
The certificate isn't summarised into a badge. It's published, batch by batch, so you can read the actual numbers.
If a supplement won't show you its test results, ask yourself why.
The verdict
New Zealand's most reviewed magnesium.
Every review below is from a verified Biosphere customer.
Customer Reviews
Overall rating: 4.8 / 5 from 1689 reviews.
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 :)
Easy and yum way to take magnesium...and can add other less palatable things to it as well
Amazing product, blood pressure dropped from 178 to 141 after one month of use.
First 'dissolve in water' supplement I've had that wasn't sickly sweet! Nice subtle flavour, little bit of natural tasting sweetness. Perfect!
Great tasting product will order again
Great tasting magnesium, taken an hour after dinner for a restorative sleep. Highly recommend, easy to drink mango/pineapple os delicious!
Tastes nice & works well.
I actually love the flavour! I have noticed an increase in energy levels. Highly recommend.
Great taste, but more importantly noticeably helps me with consistent sleep, migraine reduction and to reduce cramp in legs and feet at night.
I’m loving this quality magnesium product from BioSphere as it has transformed the quality of my sleep.
I was sceptical but desperate when I started using Gut Support. After the first month, there hadn’t been a huge change, but I decided I was going to give it 2 months. Only a week into the second tub I noticed a definite change, and after not quite 2 months my system is so much calmer and more regular - the best it has been in nearly 6 years.
Nerve pain gone , deep sleeps after taking this . ! I am about to reorder , thanks guys 😍
This has been a game changer for me . It has eased pain and cramping at night . It promotes a feeling if calm and relaxation . I will never stop using this . Please buy it . I promise you won’t be sorry . Carolyn
Just love this product. I am on my third tin. I have been able to halve my blood pressure medication.
Sleep so much better and no more cramps
I won't need to ask for my money back. It works! The quality of my sleep has improved 10 fold.
Helps me stay asleep all night long
Prompt delivery and high quality. Noticed my eyesight not troubling me as much within a week.
It was a tough winter but this Biosphere Immune got us through.
I began taking this product 2 weeks ago to help with my sleep due to RLS and aching muscles due to injuries. Its great. I fall asleep well and sleep longer. I love the lemon lime flavour too!
Great quality astaxanthin and an easy addition to my daily supplement routine. I take it for its antioxidant, skin and general healthy-ageing benefits. Simple, well-dosed and no fuss. Very happy with it.
Awesome product!
Love it
Really like the flavour and taste, it encourages me to use it daily !
My husband and I have both been taking Biosphere Nitric Oxide, and we’ve been really happy with how we feel since starting it. We both feel so much better overall and have noticed a real difference in our general well-being and energy. It’s now become part of our daily routine, and based on our personal experience, we’re very pleased with it. It’s not often that we find a product that we both feel has made a noticeable difference, but this one has. We’ll definitely continue taking it!
Another one bites the dust! I’m really benefiting from taking this product every evening. I’m sleeping through the night, and waking refreshed. I would recommend this to anyone as a fuss free, easily digestible form of magnesium for settling your nervous system and allowing good sleep patterns.
Really like the Biosphere Magnesium. It's so helpful before and after hard physical work when I tend to get plagued with cramp. Alongside other salts & good hydration it's been great .Also very pleasant to drink. My wife also likes to use it at night for restless legs & to help relax. 😊
I love this product. I noticed an improvement in my skin. Looks and feels so much smoother.
I have systemic health issues and this is great for sleep, nerves and digestion (in a slow moving system). Great combination of types of magnesium. Easy to mix and take.
Great product. I take it every morning 🙂
Having parkinsons disease, exercise is very much my medication but has consequences the magnesium helps with the cramps and sleep quality which makes tomorrow better.
60 nights to decide.
Try Biosphere Magnesium every night for 60 nights. If your sleep hasn't changed, email us. We'll refund you in full.
- Full refund within 48 hours of your email.
- No questions asked. No forms.
- Keep the tub either way. No returns.
Before you order
Common questions.
Will this actually help if my main issue is menopause, not just sleep?
Magnesium works on two of the sleep systems oestrogen disrupts: GABA signalling 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.
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.
I've tried magnesium before. What's different here?
Check the elemental magnesium per serve on that label, and the form. Most of the ones that didn't work are 150 to 250mg of oxide. The dose section above shows the difference.
What does it taste like?
Choose Blueberry-Pomegranate, Lemon-Lime or Mango-Pineapple. All three use natural flavours, with monk fruit and stevia for sweetness. There is no added sugar. Use more water if you prefer a lighter flavour.
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.
What about menopause weight gain?
No. This isn't a weight-loss formula and we don't claim it helps with weight. It's a no-added-sugar magnesium drink for the sleep part of menopause.
Is this suitable for diabetics?
Yes. We only use stevia leaf extract and monk fruit extract for sweetness, and there is no added sugar.
Menopause is the transition. Sleep is the first thing worth getting back.
You've read the mechanism. You've seen the trials. You know what magnesium does and what it doesn't. The only thing left is 60 nights to find out.
Biosphere Magnesium
$56.00
$69.99