Magnesium spray, often referred to as magnesium oil, is a solution of magnesium chloride flakes dissolved in water, creating a highly concentrated topical application. This method is promoted as an alternative delivery system that bypasses the digestive tract, where oral magnesium supplements can sometimes cause gastrointestinal distress. The central question for many consumers is whether applying this mineral directly to the skin, a method known as transdermal delivery, is an effective way to increase the body’s magnesium levels. Evaluating this effectiveness requires examining the biological hurdles of skin absorption and the specific uses for which the product is most commonly employed.
The Science of Transdermal Absorption
The skin is a complex and highly effective barrier, primarily designed to keep foreign substances out and internal moisture in. The outermost layer, the stratum corneum, is composed of tough, dead cells embedded in a lipid-rich matrix, which presents a significant challenge for the absorption of charged particles like magnesium ions. Because magnesium exists in an ionized form, it is not easily able to diffuse through the skin’s fatty layers.
For the magnesium to pass into the deeper tissues, it must utilize limited pathways such as hair follicles and sweat glands. These appendages constitute a small fraction of the total skin surface, generally estimated to be between 0.1% and 1%, which restricts the overall volume of mineral that can be absorbed.
While some small-scale pilot studies have suggested transdermal application can significantly increase cellular magnesium content over several weeks, the overall scientific consensus remains divided. Some research has shown that applying a highly concentrated magnesium solution can lead to an average rise in cellular magnesium content, with one pilot study observing a nearly 60% increase in subjects after 12 weeks of use. However, these findings are often based on small sample sizes and measurements in hair or saliva, rather than standardized serum blood levels. Systematic reviews contend there is insufficient clinical evidence to support the claim that transdermal magnesium provides systemic absorption comparable to oral supplementation. The debate centers on whether the magnesium ions are absorbed in a quantity large enough to correct a systemic deficiency or whether the benefits are primarily localized.
Primary Reported Uses
Despite the scientific discussion regarding systemic absorption, many people use magnesium spray for specific, localized conditions. The most common application is soothing muscle soreness and cramps following physical activity. Since magnesium plays a role in muscle relaxation and nerve transmission, applying the spray directly to fatigued areas may help calm overactive muscle fibers.
The spray is also frequently used to alleviate the uncomfortable sensations associated with Restless Legs Syndrome (RLS). This neurological disorder often involves an uncontrollable urge to move the legs, and magnesium’s function in regulating neuromuscular activity is thought to provide relief when applied directly to the calves and feet.
Studies examining magnesium’s effect on RLS symptoms suggest topical application can improve both symptom severity and sleep quality. Promoting general relaxation is another popular use. Magnesium influences the inhibitory neurotransmitter GABA, which helps quiet the nervous system. Users often apply the spray before bed, believing the localized muscle-calming effect contributes to a more relaxed state. A small study on individuals with fibromyalgia also reported a reduction in symptoms after using a topical magnesium solution.
Safety and Proper Application
When using magnesium spray, it is important to follow proper application techniques to maximize comfort and manage common side effects. The most frequently reported reaction is a mild stinging, itching, or tingling sensation on the skin, which is more noticeable on sensitive or freshly shaved areas.
This sensation is generally due to the high salt concentration of the magnesium chloride solution. To mitigate this irritation, users can start by diluting the spray with water before application or by applying it only to less sensitive areas like the soles of the feet or the torso.
It is advisable to avoid applying the product to broken skin, cuts, or mucous membranes, as this will intensify the stinging feeling. After spraying, gently massaging the area can help the solution absorb more effectively.
The spray can be left on the skin for at least 20 minutes to allow for potential absorption, and then rinsed off if the residue or stickiness is bothersome. While topical magnesium is generally safe for most people, those with severe kidney conditions should exercise caution, as their body’s ability to excrete excess minerals may be impaired.