Magnesium Lotion vs. Balm vs. Spray: What the Evidence Says

Magnesium lotion is a moisturizer with added magnesium, often magnesium chloride, that you rub into your skin; a magnesium balm uses a richer fat or wax base, and a spray is a watery solution. Whether any of these raises your body's magnesium in a meaningful way is unproven: a 2017 review concluded that transdermal magnesium could not yet be recommended.

Below, we compare the three formats, summarize what absorption studies found, look at sleep and muscle claims, and cover who should check with a doctor first.

Magnesium lotion vs. balm vs. spray: what's the difference?

All three put a magnesium salt on your skin. The difference is the base it's carried in.

Our magnesium spray guide covers sprays in depth; here we focus on lotions and balms.

Does magnesium lotion absorb through the skin?

The skin is a barrier

In "Myth or Reality: Transdermal Magnesium?", a 2017 review in Nutrients, Gröber and colleagues explain that the outer layer of skin is water-repellent and fatty, while dissolved magnesium is a charged ion that doesn't cross fatty layers easily. Any uptake would likely run mainly through hair follicles and sweat glands, which cover only about 0.1% to 1% of the skin's surface. A 2014 minireview in Experimental Biology and Medicine similarly notes that earlier studies found magnesium is not readily absorbed through healthy, intact skin, and that direct evidence on how it might cross remains limited.

What the lotion and cream studies found

The Gröber review describes a placebo-controlled trial of a magnesium lotion that found no significant change in blood magnesium. It also cites a lab study on donor skin in which a magnesium chloride cream delivered more magnesium than a plain solution, which performed about the same as a control. That's an interesting hint that the vehicle matters, but it was a lab result, not a human trial.

The best-known human study is a 2017 pilot in PLoS ONE (Kass et al.). Twenty-five adults applied a magnesium cream (56 mg of magnesium a day) or a placebo cream for about two weeks. Across everyone, the change in blood magnesium was not statistically significant. In non-athletes only, blood magnesium in the cream group rose about 23%, which was significant. The study was small and single-blind, and a co-author declared a financial interest in transdermal magnesium creams. The authors called for larger, longer studies.

The bottom line from the reviewers

Gröber and colleagues concluded, "we cannot yet recommend the application of transdermal magnesium," and noted that oral magnesium supplementation is far better documented. Nothing we found since overturns that.

Does the format matter?

For absorption, there isn't enough evidence to rank lotion, balm and spray. Nobody has tested them head to head in people, and the one lab comparison involved a cream and a solution on donor skin.

For skin feel and moisture, format matters more clearly. The American Academy of Dermatology (AAD) says ointments and creams add more moisture to skin and are more effective than lotions, and recommends applying moisturizer right after bathing while skin is still damp. So a practical way to choose:

• Lotion if you want something light to cover large areas quickly.
• Balm if your skin is dry and you like a richer, slower-absorbing texture, often at night.
• Spray if you want the quickest application and don't mind a watery feel; see our magnesium spray guide for tips if it tingles.

Magnesium for sleep, stress and muscles: what's actually known

For sleep, Harvard Health notes that some initial studies suggest more magnesium may help with insomnia, but that the evidence is limited. That discussion concerns magnesium intake from food and supplements, not lotions or balms. We didn't find a published clinical trial showing that a magnesium lotion or balm improves sleep, stress or muscle recovery.

Enjoying a balm as part of a bedtime routine is a fine reason to use one. Just treat label claims about sleep, stress or deficiency as marketing, not established fact.

Do you even need extra magnesium?

Probably not, if you eat a varied diet. The NIH Office of Dietary Supplements (ODS) sets adult intakes at 400 to 420 mg a day for men and 310 to 320 mg a day for women, and lists green leafy vegetables, legumes, nuts, seeds and whole grains as good sources. It says symptomatic deficiency from low dietary intake is uncommon in otherwise healthy people. The ODS page doesn't address topical magnesium.

How to choose and use a magnesium lotion or balm

1. Decide what you want from it. If it's moisture and a relaxing routine, pick the texture you enjoy. If it's correcting a deficiency, talk with a doctor instead.
2. Patch-test. The AAD's at-home test uses a quarter-sized spot on the inner arm or bend of the elbow, twice a day for 7 to 10 days.
3. Apply to clean, intact skin. Skip broken, freshly shaved or irritated areas.
4. Start small. Follow the label and begin at the low end.
5. Apply after a shower while skin is still slightly damp, which the AAD recommends for moisturizers in general.
6. Stop if you react. Wash it off if it stings, itches or turns red, and stop if irritation persists.

What to look for when buying magnesium lotion or balm

• The magnesium form. Most topical products use magnesium chloride; check the label.
• Base ingredients. Balms often use tallow, shea butter or oils, which matters if you have sensitivities or prefer plant-based products.
• Fragrance. The AAD recommends fragrance-free products for dry, sensitive skin.

Our magnesium collection currently focuses on balms and sprays, and our tallow skincare range includes tallow-based balms. From the listings:

• Magnesium Bedtime Balm by Balmy Tallow combines grass-fed tallow, shea butter and magnesium oil, lightly scented with lavender, chamomile and cedarwood essential oils.
• Dead Sea Magnesium & Tallow Balm by Grazly is a 2.5 oz balm made with grass-fed beef tallow and magnesium chloride.
• Come Alive Herbals Magnesium Mist is a topical magnesium spray with lavender, ylang ylang, geranium, cedarwood and patchouli.

Considering a tallow-based balm? Read our balanced guide to beef tallow for skin first.

Who should be careful with topical magnesium

• People with kidney disease. The ODS says the risk of magnesium toxicity rises with impaired kidney function. Topical products haven't been well studied, so ask your doctor before using them.
• Anyone pregnant, breastfeeding or taking medications. Check with your doctor or pharmacist before adding magnesium in any form.
• Sensitive skin, eczema or fragrance allergies. Patch-test, choose fragrance-free where possible, and avoid broken skin. The 2014 minireview notes damaged skin may let more magnesium through, another reason to use intact skin.
• Children. Ask your pediatrician before using magnesium products on kids.
• Anyone with symptoms of deficiency, such as muscle cramps, numbness or an irregular heartbeat, should see a doctor rather than self-treat.

FAQ

Does magnesium lotion actually work?

As a moisturizer, it can feel pleasant like any lotion. As a way to raise your magnesium, it's unproven. A 2017 review concluded transdermal magnesium couldn't yet be recommended, one placebo-controlled lotion trial found no significant blood change, and a small cream study saw a significant rise only in non-athletes. If you think you're low, ask a doctor.

Is magnesium lotion better than magnesium spray?

For absorption, no study we found compared them head to head in people. A lab study on donor skin found a cream delivered more magnesium than a plain solution, but that hasn't been confirmed in humans. The bigger difference is feel: lotions and balms moisturize, while sprays are watery and quicker to apply.

What is magnesium balm used for?

People typically use magnesium balm as a rich moisturizer and as part of an evening routine, rubbing a small amount into the skin. Many balms are sold for sleep or muscle recovery, but we didn't find published trials showing a balm does either. Enjoy it for how it feels, and treat health claims with caution.

Where should you apply magnesium lotion?

There's no research showing one area absorbs better. One spray we carry suggests the feet, wrists or stomach, and many people use their arms or legs. Choose clean, intact skin, avoid freshly shaved or irritated areas, and keep it away from your eyes, mouth and face. Applying right after a shower, while skin is slightly damp, helps any moisturizer, according to the AAD.

Can you use too much magnesium lotion?

Topical overdose hasn't been well studied. The ODS upper limit of 350 mg a day applies to magnesium from supplements and medications, and the risk of toxicity rises when the kidneys don't work well. Follow the label, start with a small amount, and talk with your doctor first if you have kidney disease.

Can magnesium lotion replace a supplement?

There's no good evidence that it can. Oral magnesium has been studied far more than topical forms, and reviewers say transdermal absorption remains unproven. The ODS notes that most healthy people get enough from food. If you think you need more, a doctor can check your levels and suggest the right form and dose.

Sources

• Gröber U, Werner T, Vormann J, Kisters K. Myth or Reality: Transdermal Magnesium? Nutrients, 2017
• Kass L et al. Effect of transdermal magnesium cream on serum and urinary magnesium levels in humans: A pilot study. PLoS ONE, 2017
• Chandrasekaran NC et al. Effects of magnesium deficiency: More than skin deep. Experimental Biology and Medicine, 2014
• NIH Office of Dietary Supplements: Magnesium Fact Sheet for Health Professionals
• Harvard Health: Sleep and magnesium supplements
• American Academy of Dermatology: Dermatologists' tips to relieve dry skin
• American Academy of Dermatology: How to test skin care products

This guide is general information, not medical advice. Patch-test new products and ask a dermatologist or doctor about skin or health concerns.