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
New Zealand's Most Reviewed Magnesium
The Magnesium At The Supermarket Costs Less.
4.8/5 from 934 verified reviews
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.
New Zealand's most reviewed magnesium • 934 verified reviews • 40,000+ tubs sold across 150+ stores nationwide.
Here's exactly what makes it different.
And why it costs more.
Three things that separate Biosphere from everything else on the shelf.
Reason 1
Reason 1
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.
Reason 2
Reason 2
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.
Reason 3
Reason 3
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.
64%
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.
40,000+
Tubs Sold
934
Verified Kiwi Reviews
150+
Stores Nationwide
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.
4.8/5 from 934 verified reviews
Biosphere Magnesium
60 ServingsTriple-Form400mg Therapeutic Dose
$69.99$56.0020% Off
About $0.93 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
Based on 934 verified reviews
Customer Reviews
Overall rating: 4.8 / 5 from 1677 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 :)
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.
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
It’s one of those things that you don’t you don’t know what you’ve got ‘til it’s gone! I was sleeping well and didn’t notice my gym recovery was good until I ran out of magnesium! Without it, my sleep is terrible and I’m sore for days after working out. Ordering more now!
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.
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
100mg
Elemental Magnesium
Magnesium Citrate
1000mg per serve / 150mg elemental magnesium
- Highly soluble, rapid absorption
- Supports muscle relaxation and bowel regularity
150mg
Elemental Magnesium
DiMagnesium Malate
750mg per serve / 150mg elemental magnesium
- Bound to malic acid, supports cellular energy production
- Supports reduction of muscle soreness and fatigue
150mg
Elemental Magnesium
Every batch third-party tested.
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.
Is this suitable for diabetics?
Yes, our magnesium is suitable for diabetics. We only use stevia leaf extract and monk fruit extract for sweetness.
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 money-back guarantee that means you don't pay if it doesn't work.
- 60-day money-back guarantee
- Third-party tested
- Next-day Auckland dispatch
