Epsom salt (magnesium sulfate) and apple cider vinegar (ACV) can be mixed together. This combination is a common practice for external use, primarily in baths and foot soaks. Epsom salt is a mineral compound that dissolves readily in water. ACV is a solution of acetic acid, which provides its acidic properties. The two substances are frequently combined to leverage their distinct effects when applied topically.
The Components and Their Interaction
When dissolved in water, Epsom salt dissociates into magnesium and sulfate ions, while ACV introduces acetic acid. These compounds do not undergo a significant chemical reaction in the bath water, allowing each ingredient to maintain its individual properties. Magnesium ions are often linked to muscle relaxation, and warm water is thought to promote absorption through the skin.
The proposed mechanism for magnesium absorption involves the mineral passing through hair follicles and sweat glands. Regardless of systemic absorption, the warmth of the water helps relax muscles and soothe stiff joints. The acetic acid from the apple cider vinegar is the primary factor that alters the pH of the bath water.
The addition of acetic acid creates a mildly acidic environment. This is believed to help restore the skin’s natural protective barrier, known as the acid mantle. Using ACV in a soak may help rebalance the surface environment, which can be disrupted by alkaline soaps and tap water. Maintaining an acidic pH is important for the skin’s barrier function and defense against certain microbes.
Primary Uses in Topical Soaks
The mixture is most commonly used in full-body baths or localized foot soaks to address muscle soreness and general skin discomfort. Soaking in warm water with dissolved magnesium sulfate is a long-standing practice for relieving tired or aching muscles. The warmth increases blood flow to the muscles, which helps reduce stiffness and improve comfort.
The acetic acid component contributes benefits for skin conditions due to its reported antimicrobial and antifungal properties. This makes the mixture popular as a foot soak for individuals concerned with foot odor or minor skin irritations. The pH-balancing effect of the diluted ACV is thought to be soothing and supportive of skin health for issues like mild dryness or scaling.
The combination is also used by people seeking to alleviate symptoms of minor skin conditions like eczema or psoriasis. Note that these are perceived benefits and not medical treatments. By supporting the skin barrier and potentially inhibiting surface microbes, the mixture aims to provide a calming environment for irritated skin.
Essential Safety and Preparation Instructions
This mixture is strictly intended for external use and should not be consumed internally. For a full bath, add about two cups of Epsom salt and one cup of ACV to a standard bathtub filled with warm water. For a localized foot soak, mix one cup of Epsom salt and one-half cup of ACV into approximately two gallons of warm water.
The water temperature should be comfortably warm, ideally between 92 and 100 degrees Fahrenheit. Excessively hot water can be dehydrating and counterproductive. The recommended soaking duration is between 15 and 30 minutes to maximize exposure. Soaking for longer periods offers diminishing returns and may increase the risk of skin dryness.
Individuals with sensitive skin should start with a smaller amount of ACV to ensure tolerance. They should rinse their skin with plain water after the soak, especially if the vinegar odor is bothersome. The mixture should be avoided by anyone with open wounds, severe cuts, or significant skin infections, as the acetic acid can cause irritation or a stinging sensation. Pregnant individuals or those with severe pre-existing health conditions should consult a healthcare professional before trying any new topical soak.