If nothing has worked for your sleep, magnesium might.
Here are the 3 reasons why, and why the right form and dose changes everything.
60-day money-back guarantee. No improvement? Full refund.
60-day money-back guarantee. No improvement? Full refund.
Your brain struggles to switch off at night
Sleep starts in the brain. To fall asleep, your nervous system needs to shift into a calm state. That shift relies on GABA, your brain's natural calming signal.
Magnesium supports normal GABA activity. When magnesium is low, that calming signal struggles to come through, and the brain stays alert when it should be winding down.
This often shows up as:
- Racing thoughts at bedtime
- Feeling tired but wired
- Lying awake despite exhaustion
Your stress hormones stay elevated at night
Cortisol is your main stress hormone. It should naturally fall in the evening to allow sleep.
For many people, it doesn't. Magnesium plays a role in the body's normal stress response, and when levels are low, that evening wind-down is harder to reach. Your body sits in a low-level state of alertness long after the lights go out.
This can look like:
- Difficulty falling asleep
- Waking during the night
- Light, unrefreshing sleep
Your body stays tense when it should relax
Sleep is not only mental. It's physical.
Magnesium supports normal muscle and nerve relaxation. When levels are low, your body holds tension it should be releasing.
Low magnesium can contribute to:
- Muscle tightness at night
- Restlessness in bed
- Difficulty fully relaxing
Why the magnesium you tried didn't work
It almost certainly wasn't the magnesium. It was how it was made. Four corners get cut to hit a price, and each one quietly takes the result with it.
Cheap, poorly absorbed forms
Underdosed by design
Capsules can't fit a real dose
Cheap raw materials from overseas
Three forms. Three jobs. One scoop.
Most supplements pick one form of magnesium. We use three so the full 400mg dose covers sleep, muscles, and the nervous system at the same time.
Magnesium Lysinate Glycinate Chelate
Magnesium Citrate
DiMagnesium Malate
The supplement industry runs on cheap forms, fractional doses, and good marketing.
Most products are formulated to a price point, not to a result. That's why most people don't feel anything when they take them.
Three forms. Full therapeutic dose. USA-sourced raw materials. FDA-regulated facility. Third-party tested every batch. No fillers. No corner-cutting.
It costs more than a tub of magnesium oxide. It should. It's a different product.
The most reviewed magnesium in New Zealand
Available in 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.
What to expect with consistent nightly use
Magnesium does not force sleep. It removes the internal friction that makes sleep difficult. Here's the pattern most people report:
Evenings feel calmer
Falling asleep gets easier
Full benefit builds
Biosphere Magnesium
Less than $0.94 per night. Two months supply. NZD.
Choose flavour
- 400mg elemental magnesium per scoop
- USA-sourced magnesium forms, GMP certified, third-party tested
- Naturally flavoured. No fillers, no artificial sweeteners.
60-day money-back guarantee · Next-day Auckland dispatch
The only risk is not trying it.
Take it for 60 nights. If you're not feeling deeper, calmer sleep, get every dollar back. No questions, no hoops to jump through. 64% of customers reorder within 90 days. We're that confident it works.
Frequently asked questions
How fast will I notice a difference?
Most people feel a meaningful shift in sleep quality within 3 to 7 nights. Falling asleep faster and waking less in the night usually come first. Full benefit builds over 2 to 4 weeks as your magnesium levels restore.
Will it make me drowsy in the morning?
No. Magnesium works with your body's natural sleep cycle, not against it. Unlike sedatives or sleep medications, there's no morning grog. Most customers report waking refreshed and alert.
Is it safe to take with my medications?
If you're on prescribed medication, particularly blood pressure medication, antidepressants, or sedatives, please consult your GP before adding any supplement. Many customers use Biosphere Magnesium alongside their medications with medical supervision.
Can I take it long-term?
Yes. Magnesium is non-habit forming and your body doesn't develop tolerance. 64% of our customers reorder within 90 days, taking it as part of their ongoing nightly routine.
What does it taste like?
Naturally flavoured, sweetened with monk fruit and stevia. No artificial sweeteners, no synthetic flavours. Most customers find it pleasant enough to actually look forward to as a nightly ritual.
Is it vegan and allergen-free?
Yes. Biosphere Magnesium is vegan, gluten-free and dairy-free, with no artificial colours, flavours, fillers, or binders.
Everything you need. Nothing you don't.
Less than $0.94 per night. NZD.
- 1 tub of Biosphere Magnesium · 60 servings
- 20% off your first order, applied at checkout
- Next-day Auckland dispatch on every order
- 60-day money-back guarantee, no questions asked
