Making magnesium spray at home takes about five minutes and requires just two ingredients: magnesium chloride flakes and distilled water. The basic ratio is equal parts by volume, one cup of flakes dissolved in one cup of water, which produces a concentrated solution you can spray directly onto your skin.
What You Need
The ingredient list is short, but the quality of what you use matters.
- Magnesium chloride flakes: Look for USP or pharmaceutical-grade flakes. This designation means the product has been tested for purity (98% or higher) and contains very low levels of heavy metals, under 10 parts per million. Since you’re applying this to your skin regularly, avoiding industrial-grade flakes is worth the small price difference.
- Distilled or filtered water: Tap water contains minerals and microorganisms that can shorten the shelf life of your spray. Distilled water keeps the solution stable for longer.
- A spray bottle: Glass is ideal for long-term storage. A standard 8-ounce or 500ml bottle works well.
You’ll sometimes see magnesium sulfate (Epsom salt) suggested as an alternative. Magnesium chloride is the better choice for a topical spray. Research published in PubMed notes that magnesium chloride has more favorable pharmacological effects and lower tissue toxicity compared to magnesium sulfate.
Step-by-Step Instructions
Bring your distilled water to a boil or near-boil. This helps the flakes dissolve completely and quickly. Pour the hot water over the magnesium chloride flakes in a heat-safe bowl or measuring cup, using a 1:1 ratio. For a standard batch, that’s one cup of flakes to one cup of water (roughly 250g flakes to 250ml water).
Stir until the flakes dissolve fully. The liquid will look clear and feel slightly oily between your fingers, which is why people call it “magnesium oil” even though there’s no actual oil in it. Let the solution cool to room temperature, then pour it into your spray bottle. That’s it.
How to Use It
Spray it directly onto your skin and rub it in. Common application spots include the legs, arms, stomach, and the soles of your feet. Most people use 5 to 10 sprays per application. You can leave it on or rinse it off after 20 to 30 minutes if the residue bothers you.
Many people spray it on before bed. Magnesium plays a role in shifting your brain’s balance toward calming neurotransmitters, and it supports your body’s production of melatonin, the hormone that regulates your sleep-wake cycle. If racing thoughts or nighttime anxiety keep you awake, a magnesium routine before sleep may help take the edge off. It also shows promise for people whose sleep is disrupted by leg cramps or restless legs syndrome.
For the best results, pair it with consistent sleep habits: a regular bedtime, limited screen time before bed, and a cool, dark room.
Why It Stings (and How to Fix It)
The most common complaint about magnesium spray is a tingling, stinging, or mild burning sensation when you first start using it. This is normal and not a sign of an allergic reaction. It tends to fade after the first week or two as your skin adjusts.
If the sensation is too uncomfortable, you have a few options. You can dilute your spray by adding more distilled water to the bottle, bringing the ratio down from 1:1 to something gentler like 1 part flakes to 2 parts water. You can also apply a moisturizer after the magnesium has had a few minutes to absorb. Spraying onto the soles of your feet, where skin is thicker, is another way to avoid the sting entirely. Avoid applying it to freshly shaved skin or broken skin, which will intensify the sensation.
Storage and Shelf Life
Homemade magnesium spray lasts up to six months when made with distilled water and stored properly. Keep it in a glass spray bottle at room temperature. A bathroom counter or shower shelf works fine. If you make larger batches, store the extra in a sealed glass bottle in a cabinet. There’s no need to refrigerate it.
You’ll know the spray has gone off if it develops an unusual smell or visible cloudiness. Using tap water instead of distilled water significantly shortens this timeline, so the distilled water step is worth not skipping.
Adjusting the Strength
The standard 1:1 ratio produces a concentrated spray. This is a good target for most people, but it’s not where everyone should start. If you have sensitive skin, begin with half the amount of flakes (so one cup of water to half a cup of flakes) and increase gradually over a few weeks as your skin adapts. You can always add more flakes to strengthen the solution later.
People with kidney disease should be cautious with any form of supplemental magnesium, including topical application. The kidneys are responsible for clearing excess magnesium from the body, and impaired kidney function can cause it to build up. If you’re pregnant or managing diabetes, check with your doctor before adding magnesium spray to your routine.