If you wake up at night with leg cramps, your body is short of one specific thing.
It's magnesium. The right form, at a dose that actually works.
It is not just the cramp.
A sharp, stabbing pain in your calf or foot. You wake up in agony, stretch it out, and lie there waiting for it to come back.
Some nights it happens two or three times. You have stopped being surprised by it.
And it is not the only sign. People who get regular nighttime cramps usually notice a few other things too:
Restless legs in the evening that will not let you settle.
General muscle tightness that never quite releases.
Waking in the night even on nights without cramps.
These are not three separate problems. They share one root cause.
It isn't something your body does. It's something your body is short of.
Muscles work on a two-signal system. Calcium tells them to contract. Magnesium tells them to release.
When magnesium levels drop, the release signal weakens. Your muscles contract but struggle to fully let go.
At night, this becomes a problem. Your circulation slows. Your muscles cool. You are not moving. A small trigger, turning over, pointing a foot, fires a contraction your muscle cannot release quickly enough.
That is the cramp.
Restless legs follow the same pattern. Nerves held in low-level tension. Muscles that cannot fully settle. Moving temporarily relieves it, but until the mineral balance is restored, it keeps coming back.
This is not age. It is not random.
It is a mineral balance problem, and it is correctable.
We did not try to make the cheapest magnesium. We made the one most likely to reach your muscles.
Walk into any pharmacy and you will see a wall of magnesium products. Twenty different brands, all competing on price, all looking roughly the same. Most people pick one, try it for a few weeks, notice nothing, and assume magnesium is not for them.
The problem was never the magnesium. It was the product.
Many magnesium products use forms your body barely absorbs. They break down in your stomach, most of the magnesium passes straight through, and very little reaches the muscles and nerves that actually need it.
We took a different approach. Instead of trying to hit a price point, we asked one question: what would it take to give someone the best possible chance of actually noticing a difference?
Magnesium Citrate
Highly soluble. Rapid absorption. Targets muscle relaxation.Magnesium Malate
Gentle, sustained delivery. Supports cellular energy and recovery.Magnesium Glycinate Chelate
Crosses the blood-brain barrier. Reaches your nervous system directly.No artificial sweeteners, colours, or flavours. Because cutting corners on quality to save a few cents defeats the purpose of making a product that works.
New Zealand's Most Reviewed Magnesium.
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-Day Money Back Guarantee
If you don't feel a difference, you get every dollar back. No forms. No questions asked. Just email us.
Biosphere Magnesium
Less than $0.93 per night. Two months supply.
Choose your flavour:
- No artificial colours, flavours, or sweeteners
- Third-party tested for purity and heavy metals
- GMP certified, FDA-regulated USA facility
What changes when your magnesium levels come back up.
Magnesium does not force muscles to relax. It restores the balance that makes relaxation possible. Results build with consistent nightly use.
The cramps start to ease. They may still come, but less often and less severe. Some people find entire nights pass without waking. Your calves feel less tight in the morning.
Cramps become occasional instead of nightly. You start sleeping through. Restless legs settle earlier in the evening. The background muscle tension starts to release.
Cramps stop being a nightly event. Mornings feel different when sleep has not been interrupted. Your legs feel like they belong to you again.
No sedation. No side effects. No dependence.
Just muscles that can finally let go.
Your body cannot make magnesium. It can only use it and lose it.
Most people assume they get enough from food. They do not. Modern life drains magnesium faster than most diets replace it.
Burns through it with every stress response
The more you drink, the more your kidneys release
Reflux tablets and blood pressure pills reduce absorption
The same diet that worked at 30 is not enough at 50.
Both accelerate the loss
Decades of farming have depleted the soils
Most adults in their 40s, 50s, and 60s are dealing with several of these at once. The cramps are not the problem. They are the symptom of a shortage your body has been accumulating for years.
Your muscles are not failing. They are missing the mineral they need to release. That is specific. And it is fixable.
No improvement. Full refund. No return required.
You have tried things before. We know.
The stretching. The bananas. The tonic water. Maybe even a magnesium product from the supermarket that did nothing.
You are right to be cautious about trying something new.
So do not take our word for it. Take our guarantee.
Try it for 60 days. If your cramps do not improve, you get every cent back.
No forms. No arguments. No return required.
You either notice the difference, or you do not pay for it.
64% of customers reorder within 90 days. That is when most people decide they are not willing to go back to how it was before.
Honestly, in plain English.
I have tried magnesium before and it did not help my cramps.
Many magnesium products use forms your body absorbs poorly, at doses too low to reach your muscles in meaningful amounts. If you tried one and felt no difference, the product most likely was not delivering enough usable magnesium where it was needed. Biosphere uses three forms specifically chosen for absorption, at a full 400mg elemental dose per serve. The form and the dose are the entire reason it works or it does not.
Will it help with restless legs as well as cramps?
Many customers report restless leg improvement alongside cramp reduction. The underlying cause is the same: muscles and nerves that cannot fully settle. Magnesium helps both.
Is it safe to take every night long-term?
Yes. All three forms of magnesium in this product are well researched and safe for ongoing daily use. Many customers have been taking it for over two years.
Is it safe alongside medications?
Magnesium is generally safe, but if you are taking prescription medications, it is worth a quick conversation with your GP before starting. This is especially true if you take anything for blood pressure, reflux, or kidney function.
You have adjusted. You have stretched. You have accepted.
Your muscles are not doing this randomly. They are doing it because the mineral that tells them to release is not present at the level your body needs.
That is specific. And it is addressable.
