Why Does Magnesium Spray Burn My Armpits?

If you’ve ever applied magnesium spray to your armpits and experienced an uncomfortable burning sensation, you’re not alone. This reaction can be puzzling and frustrating, especially if you’re using the spray for its touted benefits, like muscle relaxation and enhanced sleep.

Magnesium is an essential mineral that plays a critical role in numerous bodily functions, including muscle function, nerve transmission, and energy production.

Many people use magnesium supplements to address deficiencies or to relieve muscle cramps and improve sleep quality. One popular form of supplementation is magnesium spray, which is applied topically to the skin.

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In this article, we’ll explore the reasons why magnesium spray can cause a burning sensation in your armpits, and how you can mitigate this effect.

Benefits of Magnesium Spray

  1. Improved Sleep: Magnesium can help calm the nervous system, potentially aiding in better sleep.
  2. Muscle Relaxation: It can relieve muscle tension and cramps.
  3. Stress Reduction: Magnesium has a soothing effect that can help manage stress levels.

Despite these benefits, applying magnesium spray to certain areas of the body, such as the armpits, can cause discomfort.

Skin Reaction due to Magnesium Spray on armpit

Why Does Magnesium Spray Burn?

If applying magnesium spray to your armpits results in a burning sensation, there are several reasons why this might be happening:

1. High Magnesium Concentration

Magnesium sprays often contain high levels of magnesium chloride. The armpits have thin, sensitive skin that is more prone to irritation. When this concentrated solution comes into contact with the delicate skin under your arms, it can cause a stinging or burning sensation.

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2. Skin Sensitivity

The skin in your armpits is naturally more sensitive due to the higher density of sweat glands and hair follicles. This sensitivity is further heightened if you have recently shaved or waxed your armpits. These grooming practices can leave tiny cuts and abrasions, making the skin more susceptible to irritation when applying magnesium spray.

3. pH Imbalance

The skin’s natural pH is slightly acidic, usually around 4.5 to 5.5. Magnesium chloride, on the other hand, is more alkaline. Applying an alkaline substance to skin that is already sensitive can disrupt its pH balance, leading to irritation and a burning feeling.

4. Open Pores and Broken Skin

Shaving can leave your skin with small nicks and open pores. Applying magnesium spray immediately after shaving can cause a burning sensation because the spray can penetrate these tiny cuts and open pores, leading to increased irritation.

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5. Allergic Reactions

Although rare, some people may have an allergic reaction to magnesium chloride or other ingredients in the spray. Signs of an allergic reaction include severe redness, swelling, itching, and persistent burning. If you suspect an allergic reaction, stop using the spray and consult a healthcare professional.

How to Reduce the Burning Sensation of Magnesium Spray

How to Reduce the Burning Sensation of Magnesium Spray

1. Test Before You Apply

Before applying magnesium spray to your armpits, test it on a less sensitive area of your body, such as your forearm. This patch test can help you determine if your skin reacts negatively to the spray.

2. Dilute the Spray

If the concentration of magnesium in the spray is too high, try diluting it with a small amount of distilled water. This can help reduce the intensity of the burning sensation. Start with a 50/50 mixture of water and magnesium spray, and adjust as necessary based on your skin’s response.

3. Apply to Dry, Clean Skin

Ensure that your skin is clean and completely dry before applying magnesium spray. Moisture can increase the likelihood of irritation. Avoid applying the spray immediately after showering or shaving when your pores are more open.

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4. Moisturize After Application

After applying magnesium spray, wait for it to dry completely, and then apply a gentle moisturizer to the area. This can help soothe the skin and reduce irritation.

5. Use Aloe Vera

Aloe vera has natural soothing properties that can help alleviate skin irritation. After applying magnesium spray and letting it dry, apply a thin layer of aloe vera gel to your armpits. This can help calm the skin and reduce the burning sensation.

Best Alternatives to Magnesium Spray

Best Alternatives to Magnesium Spray

If you find that magnesium spray consistently irritates your skin, consider alternative methods of magnesium supplementation.

1. Magnesium Oil

Magnesium oil is similar to magnesium spray but often formulated to be less irritating. It can be applied to less sensitive areas of the body, like the arms or legs.

2. Epsom Salt Baths

Epsom salt (magnesium sulfate) baths are a relaxing way to increase your magnesium levels without the risk of skin irritation. Soaking in a warm bath with Epsom salts can help absorb magnesium through the skin while providing additional relaxation benefits.

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3. Oral Supplements

Magnesium supplements in pill or powder form are widely available and can be an effective way to increase your magnesium intake without applying it to the skin. Always consult with a healthcare professional before starting any new supplement regimen.

If you experience severe or persistent burning, redness, swelling, or other symptoms of an allergic reaction after using magnesium spray, discontinue use immediately and consult a healthcare professional. Persistent skin irritation could indicate an underlying issue that needs medical attention.


Magnesium spray can be a beneficial addition to your wellness routine, but it’s important to be aware of the potential for skin irritation, especially in sensitive areas like the armpits. By understanding why magnesium spray can burn and taking steps to mitigate this effect, you can enjoy the benefits of magnesium without discomfort.

If irritation persists, consider alternative forms of magnesium supplementation or consult with a healthcare professional for personalized advice.

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