Magnesium spray: the best magnesium oil sprays, compared on what you can check

A magnesium spray is a bottle of salt water, and that is not an insult. Magnesium chloride dissolved in water near saturation is the whole product in the plainest bottles; the rest of the category is a different salt, an added ingredient, a fragrance or a gentler concentration.

What no bottle can tell you is how much gets through your skin, because nobody knows. Our evidence page goes through the studies and the arithmetic, and the absorption evidence is weak. So this page ranks sprays on what you can check before you buy, which is also what decides whether you will still be using the bottle in a month. It sits in our recovery tools section.

What is the best magnesium spray?

Five bottles, each the best answer to a different question:

• Most people, plainest bottle: NOW Solutions Magnesium Topical Spray. Water and magnesium chloride, a stated dose, sold by Amazon.com.
• Wants the original Zechstein oil in a lower concentration: Ancient Minerals Magnesium Oil Ultra with MSM.
• Wants Epsom salt and a drugstore brand: Dr Teal’s Topical Magnesium Spray, fragrance-free.
• Wants the highest stated dose per spray: Aromasong Extra Strength, 23 mg per spray.
• Sensitive skin: ASUTRA’s Zechstein spray, sold as a “less sting, less itch” formula.

Every cell is what the Amazon listing or the manufacturer’s own page states as of 15 October 2026, not a measurement. Per-spray figures marked ~ are our division of the brand’s per-millilitre or per-four-spray figure. “Not stated” means we did not find it, not that the product lacks it.

Magnesium oil spray: what “oil” means

“Magnesium oil” is a name, not a description. There is no oil in any of these bottles. It is a concentrated solution of magnesium chloride in water, and the slick, slightly oily feel on the skin is what a near-saturated brine feels like. Ancient Minerals says as much in the FAQ on its own site.

That matters for two practical reasons. A brine does not soak in the way a lotion does; the water evaporates and leaves salt behind, which is the white film or tackiness every brand mentions. And a stronger brine stings more. The concentration is what you are choosing when you choose between, say, Ancient Minerals’ original oil at 100 mg of magnesium per millilitre and its Ultra at 55.

Magnesium chloride spray vs magnesium sulfate

Almost every magnesium spray is magnesium chloride. Dr Teal’s is the notable exception, built on magnesium sulfate, the compound sold as Epsom salt.

The chemistry difference in the bottle is smaller than the marketing makes it sound. Magnesium chloride hexahydrate, the form in flakes, is about 12% magnesium by weight; Epsom salt, magnesium sulfate heptahydrate, is about 10%. Both dissolve readily in water. Neither has been shown to cross skin better than the other, and the 2017 review that found transdermal magnesium unsupported covered sprays, flakes and Epsom salt baths alike.

So the choice comes down to what else you are getting. The chloride sprays here are mostly water and salt. Dr Teal’s adds a glycol and a preservative, which some people will prefer for feel and others will avoid for exactly that reason.

Pure magnesium oil spray: what “pure” can and cannot mean

“Pure” on a magnesium spray can mean two checkable things: the ingredient list is water and magnesium chloride and nothing else, as on NOW’s bottle; or the salt comes from a named source, usually the Zechstein seabed under northern Europe or the Dead Sea. Both are fair claims. Neither tells you anything about absorption.

It cannot mean the long list of health claims that often sits next to it. One widely sold pure magnesium oil on Amazon states on its listing that two out of three people are magnesium deficient and that a spray is the best way to get magnesium delivered “at a cellular level”. We did not pick it. The first claim is not what US survey data shows: the NIH reports that about half of Americans eat less magnesium than the estimated average requirement, while noting that symptomatic deficiency in healthy people is uncommon. The second claim is the one the evidence does not support.

Fragrance is the other place “pure” quietly stops applying. Alo’s Magnesium Reset Spray, for instance, is scented with mandarin orange and other essential oils and adds plant extracts including amla, valerian and arnica, according to Alo’s own blog, which also says three spritzes deliver 45 mg of magnesium. That is a choice about feel, and a reasonable one, but it is not a pure oil, and fragrance is a common reason for skin reactions.

Dr Teal’s magnesium spray

Dr Teal’s is the brand most people know from Epsom salt soaks, and its spray brings the same salt to a bottle: magnesium sulfate first, Dead Sea magnesium chloride second, then a glycol and a preservative. Its label warns against open or irritated skin and contact with eyes. Its strengths are familiarity and the fragrance-free formula. Its weakness here is that it gives no magnesium per spray, so its dose cannot be set against NOW’s 16.5 mg or Aromasong’s 23 mg. If a stated dose matters to you, it is not the bottle to buy.

How to use magnesium spray

The labels broadly agree on the method, even where they disagree on the amount:

1. Patch-test first. A couple of sprays on the inside of the forearm, then wait. If it is still stinging or red after the first application, dilute 1:1 with water, which Ancient Minerals and Aromasong both suggest, or stop.
2. Apply to clean, dry skin on the arms, legs, shoulders, back or feet, and rub it in. Avoid freshly shaved or broken skin and keep it out of your eyes.
3. Follow the stated count. That ranges from two to five sprays (NOW) to 30 a day (ASUTRA). More sprays put more salt on your skin; there is no evidence they put more magnesium in you.
4. Wipe or rinse after about 20 minutes if it dries sticky. The white film is salt.

How to make magnesium spray (DIY magnesium oil)

Homemade magnesium oil is magnesium chloride flakes and distilled water, the cheapest way into the category by a wide margin. The usual home recipe is equal volumes of each:

1. Heat half a cup of distilled water until hot. Distilled, because tap water brings its own minerals and microbes into a bottle you will keep for weeks.
2. Stir in half a cup of magnesium chloride flakes until fully dissolved.
3. Let it cool and pour it into a clean glass or plastic spray bottle.

The arithmetic: NOW states that one cup of its magnesium chloride flakes holds about 19 grams of elemental magnesium, so half a cup is roughly 9.5 g. Dissolved in half a cup of water, that gives about 170 millilitres of solution once the flakes’ own water of crystallization joins in, or very roughly 55 to 60 mg of magnesium per millilitre. That is close to Ancient Minerals’ Ultra (55) and a little over half its original oil (100). Treat it as an estimate: how tightly flakes pack in a cup changes the answer by a fair margin. Use more water if it stings.

Use magnesium chloride flakes, not Epsom salt, which makes a sulfate solution rather than magnesium oil. With no preservative, make small batches and throw out anything that turns cloudy.

What we have not measured

We have not tested any of these sprays. Every figure on this page, from magnesium per spray to bottle size and the “less sting” claim, is manufacturer- or listing-stated as of 15 October 2026, and each sentence says which. The DIY concentration is our arithmetic, not a measurement.

Two things here can be checked on a bench, and we owe them. Dose: weigh 50 sprays from each bottle on a 0.01 g scale to get millilitres per spray, then titrate a 1:1,000 dilution with a water-hardness EDTA kit to get milligrams of magnesium per millilitre, and compare the product with the label. One bottle per brand is the limit of that test, and pump pressure changes spray volume, so we would publish the spread across the 50 sprays, not one number. Sting: a blinded comparison on matched forearm patches, reported as one tester’s ranking, n=1 and subjective, not a finding.

Absorption is not on that list because it cannot be measured on a bench. It needs blood and urine samples and a placebo arm. Our how we test page says the same about every product figure on the site.

What we would buy

If you want to try a magnesium spray, the NOW Solutions bottle: two ingredients, a stated dose, sold by Amazon itself. If it stings, dilute it before switching brands. If you want to spend almost nothing, make it from flakes. And if you are buying it to fix cramps or sleep, read the evidence page first; the honest case for a spray is a cheap, low-risk skin routine, not a supplement.