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Our Promise
60-day Money-Back Guarantee
Made in the UK
Non-GMO & Pesticide-free
No artificial flavours
Vegan Friendly
Naturally Dairy-Free
Triple Action. Superior Absorption. Created using 3 different forms of Magnesium, each with their own unique structure. Not all magnesium is created equal. Different types come with different benefits, and more importantly, different absorption rates.
Supports healthy bones and teeth
Supports healthy bones and teeth Our Magnesium Complex helps to develop and maintain healthy teeth and bones, along with supporting the absorption and utilisation of calcium.
Protects the body from oxidative stress
Protects the body from oxidative stress Our formula helps to protect the body's cells from oxidative stress. Oxidative stress can be caused by a number of environmental and natural factors, including: smoking, alcohol, diet, pollution, and more.
Supports energy levels
Supports energy levels Our formula helps to promote normal psychological functioning, reduce tiredness and fatigue, and support energy levels.
Product Benefits Main Image
Vitamin D3
Vitamin D3 Vitamin D, also known as the sunshine vitamin. Our product contains Vitamin D3, which is more effective at increasing vitamin D levels in the bloodstream compared to Vitamin D2.
Promotes immune health
Promotes immune health Our product strengthens the body’s immune response. Our immune system is responsible for for protecting us against dangerous pathogens.
Supports muscle health
Supports muscle health Our Magnesium Complex contributes to normal muscle function by promoting healthy muscle contractions, including the heart.
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Ingredients

The Ingredients in our Magnesium Complex

This multi-action formula features a powerful blend of clinically-studied ingredients to boost energy levels, promote bone and muscle health, and more.

Magnesium Citrate
Magnesium Citrate 80mg elemental magnesium from 551mg magnesium citrate

Magnesium citrate is the most popular form of magneisum found in Magnesium supplements because it is very easily absorbed. This type of Magnesium is a combination of salt and citric acid with a 1:1 ratio.

Magnesium Glycinate
Magnesium Glycinate 100mg elemental magnesium from 555mg magnesium glycinate

Magnesium Glycinate (Magnesium bound with glycine - an amino acid) is one of the most bioavailable and absorbable forms of Magnesium. Amino acids are found naturally in the body where they are a building block of protein.

Magnesium Malate
Magnesium Malate 25mg elemental magnesium from 221mg magnesium malate

Magnesium malate (Magnesium bound with malic acid) is a fantastic ingredient for those that are suffering from fatigue. Malic acid is a natural fruit acid present in most cells in the body.

Vitamin D3
Vitamin D3 25ug

Vitamin D3 contributes to the maintenance of normal muscle function, bones and more.

Zinc Citrate
Zinc Citrate 4mg

Zinc Citrate helps to support your immune system and cognitive function, protect against oxidative stress, and more. Studies have also shown that Zinc can help to enhance the absorption of magnesium.

Zinc Ascorbate
Zinc Ascorbate 4mg

Zinc Ascorbate, a potent form of Zinc that is combined with Absorbic Acid (vitamin C), it is easily absorbed and rarely found in supplements due to its cost. This ingredient helps to support your immune system and cognitive function, protect against oxidative stress, and more. Studies have also shown that Zinc can help to enhance the absorption of magnesium.

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Maximum potency

Our high potency Magnesium Complex provides professionally recommended doses of Magnesium, Zinc and Vitamin D3. Each serving of our product delivers 205mg of elemental Magnesium (1328.52mg of Magnesium compounds) from three different sources.

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Enhanced absorption

Our Magnesium Complex is made using only the most bioavailable ingredients that are highly digestible and provide real and noticeable results.

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Contains added Zinc and Vitamin D3

Our Magnesium Complex contains added vitamin D3 and Zinc, which means it can help to promote immune function, protect the body's cells from oxidative stress, support cognitive function, and more.

Perfectly balanced amounts of Magnesium & Zinc.

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Testimonials Here’s what our customers have to say Over 397 Satisfied Customers with 5-star reviews. 5 Star Reviews
Good as always
Ratings

“I have been a loyal customer of Theonia since February and anxiously waiting the arrival of their Magnesium. 5 days in and it’s truly great, just as expected.”

- Corine.

Verified Customer
Amazing company and product
Ratings

“The team kindly sent me an email to tell me their Magnesium and zinc finally launched and I just received it. Prompt delivery and cant wait for my results.”

- Terry Orchard

Verified Customer
Sleep help!
Ratings

“I bought Theonia's Magnesium supplement a few days ago as the brand was recommended by a friend. I have only been taking it for 2 days but I already noticed a difference! I feel rested today and I didnt struggle to get to bed the way I usually do. I’m so grateful!!!”

- Terry R

Verified Customer
Excellent
Ratings

“Bought the Magnesium recently and was delivered already. 5 star customer service and 5 star product. Uses the best forms of magnesium available on the market, not the cheap stuff other brands use”

- Carlo Menendes

Verified Customer
Exceeded my expectations
Ratings

““I have searched high and low for a Magnesium supplement with Magnesium malate and zinc and so happy I finally found one! Theonia has great reviews and it was easy to order. Looking forward to my order”

- Sylvia Turcott

Verified Customer
Big fan of Theonia
Ratings

“I now take 4 of Theonia's supplements and I love them all. The Magnesium Complex is the newest addition to my medicine cabinet!”

- Kelly Ann P.

Verified Customer
Magnesium Complex
Ratings

“My wife and I were recommended to start on a Magnesium supplement by our doctor and we found Theonia. Our order was delivered promptly and we were generously given a discount when checking out. So far, the Magnesium complex has been excellent and we have had a great experience as new customers. We will certainly be back for more.”

- W. S

Verified Customer
Restless Legs Gone
Ratings

“I had been suffering from Restless Leg Syndrome (RLS) and was recommended this Magnesium by my nutritionist. Apparently this is the best magnesium on the whole market according to him, so thank you Theonia! ”

- James D

Verified Customer
Gold badge with text stating ‘100% Money Back Guarantee – 60 Days’ in bold lettering

Order Risk-Free now

"We’re confident you will love your results using our Magnesium Complex supplement, which is why we’re pleased to offer a RISK-FREE 60-day money-back guarantee on all orders.

If you aren’t 100% satisfied with your results, we will give you a 100% hassle-free refund, no questions asked."

Handwritten-style signature reading ‘Jake A.’

Founder at Theonia

Two bottles of Theonia Magnesium Complex with added zinc, labeled as suitable for vegetarians, each containing 60 capsules CHOOSE YOUR BUNDLE

Frequently Asked Questions

If you can’t find the answer below, please don’t hesitate to Contact Us.

HOW SHOULD I TAKE IT, AND WHO IS IT FOR? CAN I TAKE IT LONG TERM?
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  • Adults should take two (2) capsules daily with water, ideally with a meal, or as directed by their healthcare provider. Do not exceed the recommended daily dose.
  • This supplement is intended for adults aged 18+. Not recommended for children under 10. Consult your doctor before use.
  • Magnesium Complex is formulated for regular use as part of your daily nutrient intake. As with all food supplements, it should be used alongside a balanced diet and a healthy lifestyle.

IS IT SUITABLE FOR EVERYONE?
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  • Yes. This formula is 100% vegan. It uses HPMC (plant-based) capsules and algae-derived vitamin D3.
  • Allergens: This product is free from gluten, dairy, soy, and artificial additives.

Manufacturing: Produced in the EU under GMP-compliant conditions.

WHAT MAKES THIS FORMULA UNIQUE?
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Theonia Magnesium Complex provides:
205 mg Magnesium (55% NRV)
8 mg Zinc (80% NRV)
25 µg Vitamin D3 (500% NRV)
Each serving combines three forms of magnesium—bisglycinate, citrate, and malate—alongside two forms of zinc and vitamin D3 selected for their solubility and bioavailability.

WHAT RESULTS CAN I EXPECT?
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  • Nutrient effects are typically experienced over time with consistent daily use, as part of a balanced diet and healthy lifestyle. Individual experiences may vary.

ARE THERE ANY POSSIBLE SIDE EFFECTS OR INTERACTIONS?
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  • Magnesium is a naturally occurring mineral. It is generally well-tolerated at the recommended dose. In some individuals, especially if taken without food, it may cause mild digestive discomfort.
  • Consult your healthcare provider before use—especially if you are pregnant, breastfeeding, taking medication or other supplements, have a medical condition, are due for surgery, have any sensitivities, questions, or concerns. 
  • Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle.

HOW SHOULD I STORE THIS SUPPLEMENT?
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Store in a cool, dry place away from sunlight and moisture. Reseal the bottle tightly after each use.

WHAT IS YOUR RETURN POLICY?
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  • We offer a 60-day money-back guarantee. If you’re not fully satisfied, contact our support team for return instructions. Orders are shipped from our warehouse within one working day. Delivery times vary by region.

Don't just take our word for it...

Thousands of people love this product - Find out why!

Marcus K.
“I’m out there running almost daily, and I used to wake up stiff and sore. Since trying this magnesium complex, my muscles feel calmer and more relaxed. It’s easy on my stomach—no issue there—and that makes me want to keep using it daily. Definitely a winner in my routine.”
Marcus K.
Mary M.
“Before, I’d toss and turn constantly. Since I started taking this at night, I’m sleeping deeper and waking up with far less grogginess. I didn’t expect it to help this much, but I’m genuinely impressed. Sleep has improved, and I’m mornings feel so much better.”
Mary M.

Fuel Your Body, Ignite Your Energy, Feel the Difference

Experience the Benefits of Our Magnesium Complex

Experience the power of our Magnesium Complex, meticulously crafted with three advanced forms of highly absorbable Magnesium, paired with two varieties of Zinc and an optimal dosage of Vitamin D3. Our unique formula is expertly formulated to deliver the full spectrum of benefits from Magnesium and Zinc, prioritising maximum absorption to help you harness the many health advantages it brings.

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“After a few weeks of taking this, I feel more balanced overall—less tension, more stable energy, and no mid-day crashes. It’s become a staple in my day.”

Roger K.
Get Your Magnesium Complex Today! It's zero-risk with our 60 day satisfaction guarantee. Order Now