Best Magnesium on the market
5 out of 5 star rating. 
The Single Most Influential Mineral
300
Magnesium supports more than 300 enzymes in the body that are crucial for a health and energy.
4th
Magnesium is the fourth most abundant mineral in the body.
2
Formulated with two highly bioavailable forms of magnesium for superior absorption and function.
The Mighty Magnesium, Citrate & Glycinate
Adequate magnesium intake plays a vital role in supporting cognitive health, including concentration, memory and overall mental clarity. In contrast, low magnesium levels have been associated with decreased focus, reduced cognitive performance, muscle discomfort and poor sleep quality. Isotonix® Magnesium is expertly formulated with two highly absorbable forms of magnesium — citrate and glycinate — to maximize bioavailability and support optimal absorption. Each serving delivers 100% of the recommended daily value, helping you maintain healthy magnesium levels for cognitive support, muscle relaxation and restful sleep.
Product Classification
Good Manufacturing Practices
No Detectable GMO
Isotonic
Vegan
Dairy Free
Gluten-Free
It's More than Just an Electrolyte Booster
Magnesium is essential for a healthy lifestyle! Working in harmony with calcium, it helps regulate your heart and maintain normal blood pressure. But that’s not all—magnesium also supports your body’s ability to build strong bones and teeth and promotes proper muscle development. When combined with calcium and vitamin D, magnesium helps keep your bones resilient and healthy, so you can stay active and feel your best every day!
Key Ingredients & Benefits
Magnesium Glycinate*
Supports a healthy sleep quality
Promotes cognitive health and head comfort
Helps maintain normal blood pressure
Magnesium Citrate*
Supports cardiovascular health and bone health
Promotes optimal muscle health
Helps maintain normal blood sugar levels
Potassium (Bicarbonate)*
Promotes a normal heartbeat
Supports a wide variety of biochemical and physiological processes
Supports the normal transmission of nerve impulses and the contraction of cardiac, skeletal and smooth muscle
Supports the body’s ability to regulate water balance, recover from exercise and eliminate wastes
Unlock Your Body's Full Potential
Experience more than just an electrolyte booster. Unlike the magnesium we acquire from food, our highly bioavailable formula ensures superior absorption for faster, noticeable results. Feel the difference with Isotonix Magnesium!
Directions For Use
Pour one small capful (3.3 g) of Isotonix Magnesium into your favorite cup.
Add 2 fl oz of water for each capful and mix.
For best results, take twice daily — one capful in the morning and evening. If mixed with other Isotonix products, add 2 oz of water for each capful.
Isotonix Delivery System
:05 minutes
Isotonix Liquid Vitamins
- Formulated to survive digestion.
- Delivers concentrated nutrients to the site of absorption.
- Contains no fillers or binders.
- No artificial color or flavors.
:40 minutes
Standard Vitamin Tablet
- Contains lab-created coatings and lubricants.
- Often contains artificial colors, nutrients and flavors.
- Limited absorption of nutrient utilization.
Frequently Asked Questions
What benefits does magnesium provide for the body?
With its involvement in supporting over 300 enzyme reactions, magnesium plays roles in many aspects of health. With regards to bone health, it is an important component of the mineralized part of bone and supports the normal metabolism of calcium and potassium in adults. Magnesium works together with calcium and vitamin D to help keep bones strong and support bone mineral density. Magnesium also supports muscle development and movement and the transmission of nerve impulses to the muscles. Studies clearly demonstrate the effects of supplemental magnesium on muscular health. Adequate magnesium levels are also important for cardiovascular health. Studies show magnesium supports a regular heartbeat, thus promoting a healthy heart. Additionally, magnesium helps maintain normal blood pressure. Magnesium supports normal protein synthesis. As such, there is evidence that magnesium helps maintain normal blood sugar levels.
How much magnesium should I be getting, and why do I need a magnesium supplement versus getting it from my normal diet?
The recommended daily intake for adults, established by the Institute of Medicine of the National Academy of Sciences, states that adult males between the ages of 19 and 30 should be receiving 400 mg of magnesium daily. Adult females of the same age should receive 310 mg daily. For older males, the recommendation is 420 mg daily, while older females should consume 320 mg daily. Daily lifestyle factors and poor dietary choices adversely affect the amount of magnesium we are ingesting. Foods rich in magnesium include whole grains, nuts and green vegetables, which are potent sources of magnesium because of their chlorophyll content. Meats, starches, dairy products and refined and processed foods — which make up a large portion of the typical diet in today’s society — contain low amounts of magnesium.
What is the Isotonix delivery system, and how does it work?
Isotonic, which means “same pressure,” bears the same chemical resemblance of the body’s blood, plasma and tears. All fluids in the body have a certain concentration, referred to as osmotic pressure. The body’s common osmotic pressure, which is isotonic, allows consistent maintenance of body tissues. In order for a substance to be absorbed and used in the body’s metabolism, it must be transported in an isotonic state. When an isotonic substance enters the body, it will be absorbed into the bloodstream rapidly. Isotonix dietary supplements are delivered in an isotonic solution, allowing nutrients to pass directly into the small intestine and be rapidly absorbed into the bloodstream. With Isotonix products, little nutritive value is lost, making the absorption of nutrients highly efficient while delivering maximum results.
Does this product need to be taken on an empty stomach?
Yes. For maximum absorption, the product should be taken on an empty stomach.
What other health and nutrition products would complement Isotonix Magnesium?
The benefits of Isotonix Magnesium are complemented by Isotonix OPC-3®, Isotonix Calcium Plus, Isotonix Vitamin D with K2 and Heart Health™ Omega III Fish Oil with Vitamin E.
What is the best way to store this product?
Keep Isotonix products stored in a dry, cool place. If Isotonix products are stored in the kitchen, keep them away from the stove, sink, heat-generating appliances or window ledges. If you live in a very humid area, you may store Isotonix products in the refrigerator — but not in the fruit and vegetables area.
Isotonix® Magnesium Research Scope
290 mg
A study published in the Journal of Nutrition found that most U.S. adults — especially those over the age of 30 — were receiving, on average, approximately 290 mg of magnesium daily.
400 mg
According to the Institute of Medicine of the National Academy of Sciences, adult males between 19-30 should receive as much as 400 mg of magnesium daily.
310 mg
According to the Institute of Medicine of the National Academy of Sciences, adult females between 19-30 should receive as much as 310 mg of magnesium daily.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.
Reviews
Break down of ratings: (92) 5 star ratings. (2) 4 star ratings. (3) 3 star ratings. (5) 2 star ratings. (0) 1 star ratings.
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I have been using it for at least 4 months. I take it in the am and in the pm with our Isotonix Calcium +. I sleep better.
Response from Customer Service on 06/23/2026
Thank you so much for your feedback! We’re thrilled to hear that Isotonix® Magnesium has become an important part of your daily routine, and that you enjoy pairing it with Isotonix Calcium Plus. Your commitment to your wellness routine is inspiring, and we truly appreciate you sharing your experience with us!
Isotonic Magnesium
5 out of 5 star rating.
I take this product twice a day. It has helped me get real deep restful sleep and an added bonus is the regulatory I have experienced. I make due to never run out. Has been a life changer!
Response from Customer Service on 06/15/2026
Thank you so much for your wonderful review of Isotonix® Magnesium! We're delighted to hear it has enhanced your sleep and overall routine, and that it has become a must-have for you. Your feedback means a lot to us. Thank you for being a valued customer!
Magnesium
5 out of 5 star rating.
a vital role in supporting cognitive health, including concentration, memory and overall mental clarity
Response from Customer Service on 06/15/2026
Thank you so much for your review of Isotonix® Magnesium! We're glad to hear you value its support for cognitive health, concentration, memory, and mental clarity. Your feedback is greatly appreciated. Thank you for being a valued customer!
Use this one as part of your nighttime routine!
5 out of 5 star rating.
At the end of a busy day, I like having a few wellness rituals that help me stay consistent. Isotonix Magnesium is one of those products I reach for each evening because it's easy to use and fits seamlessly into my routine.
Response from Customer Service on 06/15/2026
Thank you so much for your wonderful review of Isotonix® Magnesium! We're delighted to hear it has become a trusted part of your evening wellness rituals and that you find it easy to use and convenient. Your feedback means a lot to us. Thank you for being a valued customer!
I won't go a day without it
5 out of 5 star rating.
I have my magnesium every evening before bed. It helps me unwind after a long day, and keeps me on a regular schedule. Especially when I travel, I need my magnesium every night. Thank you Isotonix for making such a wonderful product!!
Response from Customer Service on 06/10/2026
Thank you so much for your wonderful review of Isotonix® Magnesium! We're thrilled to hear it's become an essential part of your evening routine, helping you unwind and stay consistent, especially during travel. Your feedback means a lot to us. Thank you for being a valued customer and for choosing Isotonix!
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