Magnesium in IV Therapy: Why It Is in the Myers’ Formula

If you have ever felt a gentle wave of warmth spread through your body during a vitamin drip, magnesium was almost certainly the reason. It is one of the core ingredients of the Myers’ formula and one of the minerals people ask about most. Here is what magnesium does, why it is given by IV, and what to keep in mind.

Short answer: magnesium is a mineral involved in hundreds of processes, including muscle relaxation, nerve signalling, energy production and heart rhythm. It is included in Myers’-type drips for its role in muscle and nerve function. In hospitals, IV magnesium is used for specific conditions; in wellness drips, benefits for healthy people are less certain. It commonly causes warmth or flushing and needs caution in kidney disease.

What magnesium does

• Helps muscles relax after they contract
• Supports normal nerve signalling
• Is needed to produce and use ATP, the cell’s energy currency
• Helps maintain a steady heart rhythm
• Plays a part in bone health, blood sugar control and blood pressure regulation

Signs of low magnesium

Mild shortfalls are common because many diets are low in leafy greens, nuts, seeds and whole grains. Low magnesium can also result from heavy alcohol use, ongoing diarrhea, some diabetes, and certain medications such as proton pump inhibitors and some diuretics. Symptoms can include muscle cramps or twitches, fatigue, weakness, poor sleep and, when more severe, heart rhythm changes. Blood tests do not always reflect total body magnesium, since most of it is stored in bone and cells, so clinicians look at the whole picture.

How IV magnesium is used in medicine

Hospitals use IV magnesium for well-defined reasons, such as correcting a significant deficiency, certain heart rhythm problems, severe asthma attacks, eclampsia in pregnancy and, in some emergency departments, as part of migraine treatment. These are medical uses with monitoring, not wellness drips. Our article on the Myers’ cocktail and migraines explores the migraine research in more detail.

Why it is in the Myers’ formula

The Myers’ cocktail was designed to combine nutrients involved in energy, muscle and nerve function. Magnesium is central to that idea. In a Myers’-type drip, the dose is modest and given at a measured rate. Many people describe feeling relaxed afterwards, although research in healthy people is limited and the experience varies. Learn more in our Myers’ cocktail guide. Magnesium also appears in our Performance and Recovery IV.

The warm flush, explained

Magnesium relaxes the smooth muscle in blood vessel walls, which widens them slightly. That is why many people feel warmth spreading across the chest, face or lower body, sometimes with flushing. It usually feels pleasant and settles when the rate is slowed. If it is uncomfortable, or you feel light-headed or nauseated, tell your nurse.

Who needs caution

• Kidney disease. The kidneys remove excess magnesium, so reduced function raises the risk of build-up.
• Low blood pressure or a tendency to faint.
• Heart block and some other heart rhythm conditions.
• Myasthenia gravis and some neuromuscular conditions.
• Certain medications, including some antibiotics and bisphosphonates, which interact with magnesium.

A health screen reviewed by a qualified practitioner is how these risks are caught before a drip begins. See Myers’ cocktail side effects for more.

Magnesium from food and supplements

Pumpkin seeds, almonds, cashews, spinach, black beans, whole grains, dark chocolate and avocado are good sources. Oral supplements come in several forms; magnesium citrate and glycinate are commonly used, and higher doses can loosen stools. If you are considering a supplement, our naturopathic doctor can help you choose a form and dose that suits you. For athletes, our guide to electrolytes explains how magnesium fits with sodium and potassium.

Who may consider IV magnesium, and who should not

Magnesium is one of the ingredients people ask about most, but a drip that contains it is not suitable for everyone. The nurse practitioner looks at your history, medications and recent blood work before recommending any blend.

People who often ask about it

• Adults with frequent muscle tension or cramps who have already looked at fluids, sleep and training load.
• People with a diet low in leafy greens, nuts, seeds and whole grains, or a history of heavy alcohol use.
• Those taking medications that can lower magnesium over time, such as some diuretics or long-term acid-reducing pills, once their prescriber has been involved.
• People who have read about magnesium and migraine and want to understand where a drip fits alongside their main treatment plan.

People who need a different plan or extra review

• Anyone with kidney disease, because the kidneys clear magnesium and levels can build up.
• People with myasthenia gravis or another neuromuscular condition, since magnesium can increase muscle weakness.
• Those with a slow heart rate, heart block or low blood pressure.
• Anyone who is pregnant or breastfeeding, who should discuss it with their prenatal or primary care provider first.

Preparing for a drip that contains magnesium, step by step

1. Bring your medication list. Include prescriptions, over-the-counter products and supplements, especially magnesium tablets, laxatives or antacids that contain it.
2. Share recent blood work. Kidney function and electrolyte results help the team choose a safe dose.
3. Eat a light meal. Magnesium can make some people feel relaxed or slightly light-headed, which is easier to manage on a full stomach.
4. Expect a warm flush. If it feels too strong, tell the nurse. Slowing the drip usually eases it within a minute or two.
5. Stand up slowly afterwards. A short rest before you leave lets your blood pressure settle.

What the research does not cover yet

IV magnesium has well established uses in hospital medicine, but wellness drips raise questions that studies have not fully answered:

• People with normal levels. It is unclear whether extra magnesium helps energy, sleep or cramps when levels are already in range.
• Measuring the right thing. Most magnesium sits inside cells and bone, so a standard blood test can look normal even when total stores are low. Better everyday tests are still being studied.
• Dose and frequency. There is no agreed schedule for repeated wellness drips, which is why plans are reviewed rather than set in advance.

Learn more about the other ingredients in a typical blend in what is in an IV drip. For families in Woodbridge, Vaughan and Richmond Hill, blood work and follow-up can stay with the same team through our nurse practitioner primary care, so any changes to your magnesium plan are made with your full health picture in view.

Interested in a magnesium-containing drip? Learn about our Immunity Boost Myers’ Cocktail IV in Woodbridge or call 905-207-7000 to book a screening visit at AuraWell Health, 4600 Hwy 7, Unit 105, Woodbridge, ON L4L 4Y7.