The Magnesium At The Supermarket Costs Less.
There's A Reason For That.
The form. The dose. The sourcing. Three things that determine whether magnesium actually works, or just looks good on the shelf.
- 60-day money-back guarantee
- Third-party tested
- Next-day Auckland dispatch
Most magnesium looks the same on the shelf. It is not.
Walk into any supermarket or pharmacy and you'll find magnesium for $20. The bottle looks the part. The label says magnesium. But the form inside, the dose per serve, the absorption rate, and where it was sourced all tell a different story.
We started with one question: what would the best magnesium in New Zealand actually look like?
Not the cheapest to produce. The best. The one people come back for because they feel what it does.
Here's exactly what makes it different.
And why it costs more.
Three things that separate Biosphere from everything else on the shelf.
A therapeutic dose. 400mg elemental magnesium per serve.
Most capsule-based products deliver 100mg of elemental magnesium per serve or less. Research showing real improvements in sleep and muscle function used 300 to 400mg per day. At 100mg, the product isn't equipped to produce the result.
Every serve of Biosphere delivers 400mg of elemental magnesium. The dose the research uses. The dose your body actually needs.
Three superior forms. Each absorbing at 15 to 20%.
The form of magnesium determines how much your body can actually use. Most cheap supplements use magnesium oxide, which absorbs at roughly 4%. That means almost everything on the label passes straight through.
Biosphere uses three high-absorption forms, each selected for a different function in the body.
All three absorb at 15 to 20%. That's not a marginal improvement over 4%. It's the difference between a supplement that works and one that doesn't.
GMP-certified USA sourcing. Heavy metal tested every batch.
No magnesium is made in New Zealand. The raw ingredients are imported, then packaged into products here. Most of it comes from China, where heavy metal thresholds are a lot looser.
Biosphere sources from a GMP-certified facility in the USA where acceptable heavy metal levels are strictly controlled. Every batch is independently tested.
That sourcing costs more. It's not something we compromise on.
of customers reorder within 90 days.
Not because of a subscription. Not because of a reminder email. Because they notice when they stop taking it. That number tells you more than any ingredient list or comparison table.
Real comments. Real people. Unprompted.
New Zealand's most reviewed magnesium • 150+ stores nationwide
- 60-day money-back guarantee
- Third-Party Lab Tested
- Next-day Auckland dispatch
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 $0.94 per night. Two months supply
Choose your flavour:
- Third-party tested every batch
- Naturally sweetened, no artificial additives
- Vegan, gluten-free, no allergens
Next-day Auckland dispatch
Third Party Lab Tested
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.
Every ingredient. Every dose. Nothing hidden.
Complete transparency. Even the flavouring.
This product comes as a powder, so taste matters. We use only natural flavours, sweetened with monk fruit extract and stevia leaf extract. Coloured with a dash of turmeric. No artificial sweeteners. No artificial colours. Nothing that disrupts your gut microbiome.
Magnesium Lysinate Glycinate Chelate
1000mg per serve / 100mg elemental magnesium
- Chelated for maximum absorption and digestive comfort
- Supports deep sleep, stress reduction, and nervous system calm
Magnesium Citrate
1000mg per serve / 150mg elemental magnesium
- Highly soluble, rapid absorption
- Supports muscle relaxation and bowel regularity
Dimagnesium Malate
750mg per serve / 150mg elemental magnesium
- Bound to malic acid, supports cellular energy production
- Supports reduction of muscle soreness and fatigue
Frequently Asked Questions
I’ve tried magnesium before and didn’t notice a difference. Why will this be different?
Almost certainly the form and the dose. Most products use low-absorption forms at 100mg per serve or less. Biosphere uses three high-absorption forms at 400mg per serve. That combination is what produces the result.
I’m already taking magnesium. Will I notice a difference switching to this?
Most people who switch notice a difference within the first week. When your body goes from a low-absorption form at 100mg to three high-absorption forms at 400mg, it feels the difference quickly. 64% of customers reorder within 90 days.
Why is it a powder instead of capsules?
To fit 400mg of elemental magnesium into capsules, you’d need to swallow roughly 6 to 8 per serve. A powder delivers the full therapeutic dose in one scoop mixed with water. It also absorbs faster than capsules and doubles as an evening ritual most customers look forward to.
When should I take it?
Most customers take it in the evening, 30 to 60 minutes before bed. Magnesium supports relaxation and sleep quality, so evening use gets the most benefit. That said, it works regardless of when you take it.
Is this safe with my other medications?
Magnesium at this dose is safe for most adults. If you’re taking prescription medications, particularly heart medications, antibiotics, or diuretics, check with your GP or pharmacist before starting.
What if it doesn't work for me?
You’re covered by our 60-day money-back guarantee. Give it a genuine try. If you don’t feel a difference, contact us for a full refund. No forms, no questions asked.
Most magnesium supplements are built to a price. This one is built to work.
Best available forms. Therapeutic dose. Heavy metal tested. 64% of customers reorder within 90 days. And a 60-day guarantee that means you don't pay if it doesn't work.
- 60-day money-back guarantee
- Third-party tested
- Next-day Auckland dispatch
