Welcome,
A few weeks ago, I wrote a newsletter about creatine and whether runners needed it. My plan was to continue the series with magnesium, but then the California fires happened, and I didn't. BUT, now we’re back. As always, always consult your doctor before taking new supplements.
Magnesium often flies under the radar in discussions about nutrition, but it plays a vital role in maintaining overall health and runners might need more of it than the average person.
Why?
This mineral supports muscle and nerve function, helps regulate blood pressure and blood sugar levels, and even aids in post-run recovery.
What Does Magnesium Do?
Magnesium is a critical nutrient the body needs to function properly. It’s involved in over 300 enzyme reactions that impact everything from energy production and muscle recovery to bone health and brain function (and we know bone health is essential for all runners).
In simple terms, magnesium helps keep your body performing at its best while aiding recovery after hard workouts.
Why Is Magnesium Important for Runners?
If you're a runner looking to:
Improve performance
Speed up recovery
Minimize fatigue
Prevent muscle cramps and spasms
Reduce lactic acid buildup
…then taking magnesium may be important. Studies show that the more physically active you are, the more magnesium your body needs to support its increased workload.
In my experience, magnesium has been beneficial for helping relax the muscles and prevent cramps.
How Can You Tell If You’re Deficient in Magnesium?
Symptoms of magnesium deficiency can overlap with other issues, making it tricky to identify. Common signs include:
Fatigue
Muscle cramps or spasms
Nausea
Weakness
Twitching
If you suspect a deficiency, it’s important to consult a doctor. Reading this newsletter and self-diagnosing is not enough. Prolonged low magnesium levels can lead to more severe issues, such as osteoporosis or cardiovascular problems.
People at higher risk for magnesium deficiency include:
Those with gastrointestinal diseases
Individuals with type 2 diabetes
Older adults
Those not consuming enough magnesium-rich foods
How Much Magnesium Do You Need Per Day?
The NHS recommends the following daily magnesium intake:
Men: 420 mg
Women: 320 mg
Generally, it's recommended not to take doses of more than 350 mg at a time, but it's hard to find 350 mg magnesium supplements. If you over-supplement, side effects may occur, including:
Diarrhea
Nausea
Vomiting
Urinary retention
Stomach and intestinal troubles, such as bloating and cramping
Loss of appetite
Dehydration
Headaches
For most people, a balanced diet should provide adequate magnesium. However, runners often lose magnesium through sweat, and the increased physical demands of training may require supplementation.
Magnesium supplements, such as magnesium aspartate, citrate, lactate, or chloride, can help ensure you’re meeting your body’s needs. This is the magnesium supplement I prefer.
My Experience:
I began taking a magnesium supplements regularly about a year ago now. It took maybe 6 weeks to feel any sort of difference and it definitely wasn't a "miracle". I do notice I get higher quality sleep when I'm taking magnesium and my body has been recovering well over the last several months. Is it just the magnesium? No, probably not, but it's just one of those little things that may help.
So Is Magnesium Beneficial for Runners?
First, keep in mind that nothing works miracles. You aren't going to automatically drop 10 minutes from your marathon time just by taking magnesium, but it can be great for runners.
From improving performance and recovery to preventing cramps and fatigue, magnesium plays a pivotal role in helping your body...even if you don’t run.
Has magnesium helped you? Let me know!
What is Keeping Me Entertained?
Willow Springs International Raceway 8k Recap (35:38)
CookUnity Meals Review (Updated 2025)
Aliphine Tuliamuk and Emily Infeld Sign With Brooks: I guess I was surprised (but happy of course) that both went with Brooks. Brooks is really building a super team of elite female runners.
Thanks for researching this information. I wasn't aware of the potential benefits of magnesium and it might be something I need to look into taking, particularly for the recovery reasons.
I started taking magnesium about a year ago and it wasn't long before I started to notice benefits. I am a very heavy sweater, so I know I lose more electrolytes than most. But the most noticeable change occurred in my recovery. I started feeling much more fresh on my morning runs and a lot less stiffness and soreness after long runs.
But I also have experienced the side effects of too much... most noticeably in the restroom :)