What Kind of Magnesium Can Be Absorbed Through the Skin? A Comprehensive Guide

November 15, 2025 •

3 min read

Studies indicate that many adults in industrialized nations may not consume adequate amounts of magnesium through their diet alone. To help address this deficiency, exploring what kind of magnesium can be absorbed through the skin has become a popular topic among health enthusiasts and individuals seeking alternative supplementation methods.

Quick Summary

Magnesium chloride and magnesium sulfate are the primary forms of magnesium effectively absorbed through the skin via topical applications like oils, sprays, gels, lotions, and bath flakes.

Key Points

Magnesium Chloride is Primary for Transdermal Use: This highly soluble form is most commonly used in products like 'magnesium oil' sprays, lotions, and bath flakes for effective absorption.
Epsom Salts Provide Magnesium Sulfate: The magnesium sulfate in Epsom salts is also absorbed through the skin, providing a relaxing way to soothe sore muscles through baths.
Absorption Bypasses the Digestive System: Transdermal magnesium is ideal for individuals who experience gastrointestinal discomfort from oral supplements, as it avoids the digestive tract entirely.
Hair Follicles Aid Absorption: Studies show that hair follicles and sweat glands contribute to the skin's ability to absorb magnesium ions.
Factors Affect Effectiveness: Optimal absorption is influenced by the product's concentration, the duration of contact, and the condition of the skin.
Products Offer Different Experiences: Whether choosing a targeted spray or a full-body bath soak, the format of topical magnesium can be tailored to meet different needs, from targeted muscle relief to full-body relaxation.
Mild Sensations are Possible: A tingling or stinging sensation can occur with high-concentration products, especially on dry or broken skin, but is often temporary and can be managed by dilution or using lotions.

The Science of Transdermal Magnesium Absorption

Transdermal or topical magnesium application bypasses the digestive system, which can be beneficial for individuals experiencing gastrointestinal issues from oral supplements. The process involves magnesium ions moving through the skin's layers into blood vessels. Hair follicles and sweat glands contribute to this absorption, which is influenced by factors like magnesium concentration, contact duration, and skin temperature.

Key Forms of Magnesium Absorbed Through the Skin

Magnesium chloride and magnesium sulfate are the two forms most commonly used and studied for transdermal absorption.

Magnesium Chloride

Magnesium chloride is highly soluble and considered effective for transdermal delivery. It's sourced from ancient seabeds. Products include:

Magnesium Oil/Spray: A concentrated solution applied directly to the skin.
Magnesium Bath Flakes: Dissolved in baths for absorption over a longer time.
Magnesium Gels and Lotions: Magnesium chloride combined with moisturizers for gentler application.

Magnesium Sulfate (Epsom Salts)

Epsom salts (magnesium sulfate) are used topically, mainly in baths. While absorbed, magnesium chloride may be more efficiently utilized. Epsom salt baths are a traditional remedy for soothing sore muscles and promoting relaxation.

Benefits and Usage of Transdermal Magnesium

Topical magnesium offers potential benefits:

Muscle Relaxation: Helps reduce muscle aches, cramps, and spasms.
Stress and Sleep: May promote calm and support restful sleep.
Improved Skin Health: Plays a role in skin barrier function and can be soothing.
Convenience: Easy to use, especially for those avoiding pills.

Applying after a warm shower or bath when pores are open and gentle massage can enhance absorption.

Comparison of Topical Magnesium Forms


Feature	Magnesium Chloride (Oil/Spray)	Magnesium Chloride (Flakes)	Magnesium Sulfate (Epsom Salts)	Magnesium Lotion/Cream
Primary Form	Concentrated solution of magnesium chloride	Pure flakes of magnesium chloride	Crystalline magnesium sulfate	Magnesium chloride blended with moisturizers
Concentration	Very high	High	Lower than flakes/oil	Varies by product
Absorption Rate	Rapid and direct via spray/massage	Slower, whole-body immersion	Slower, whole-body immersion	Moderate, depends on formula
Application	Targeted application on arms, legs, or torso	Full body or foot bath	Full body or foot bath	All-over moisturizing
Key Benefit	Targeted muscle recovery, systemic boost	Full-body relaxation, stress relief	Soothing sore muscles, relaxation	Gentle application, skin hydration

Potential Side Effects and Considerations

A mild tingling, stinging, or itchy sensation can occur with magnesium oil or spray, often temporary and possibly related to low magnesium levels or dry skin. Diluting the product or using lotions can help. Avoid applying to broken skin. Individuals with kidney issues should consult a healthcare provider before using topical magnesium.

Conclusion

Understanding what kind of magnesium can be absorbed through the skin is key for those exploring transdermal options. Magnesium chloride in various forms is recognized for superior absorption, while Epsom salts offer a traditional bath soak. Both can bypass the digestive system for benefits like muscle relaxation and stress relief. The best choice depends on individual needs and preferences. Consistent and proper application maximizes benefits.

For additional scientific context on the permeability of certain substances through the skin, you may find research on how chemical properties affect absorption valuable.

Frequently Asked Questions

Magnesium chloride is generally considered more bioavailable and is often the more efficient choice for topical absorption compared to magnesium sulfate (Epsom salts), although both are absorbed through the skin.

The tingling or stinging sensation, which is not an allergic reaction, can result from low cellular magnesium levels, applying too much product, or using it on very dry or broken skin. The sensation often lessens with regular use.

Yes, you can dissolve magnesium chloride flakes in warm water to create a DIY magnesium oil. However, commercially prepared sprays may be purer and more concentrated.

Absorption begins immediately upon application, but it is often recommended to leave the product on the skin for at least 15-30 minutes before washing it off to allow for maximum penetration.

For systemic magnesium levels, oral supplements are the most reliable method. However, topical application offers targeted benefits, like muscle relaxation, and is a viable alternative for those with digestive sensitivities to oral intake.

You can apply topical magnesium to large, fleshy areas of the body, such as the torso, arms, and legs. Applying it to the feet, where there are many sweat glands, is also common.

Yes, many people use magnesium oil or lotion before bed to help promote relaxation and improve sleep quality due to its calming effects on the nervous system.