Epsom salts — known scientifically as magnesium sulphate heptahydrate — are a naturally occurring mineral compound containing magnesium, sulphur and oxygen. They have a crystalline structure similar to table salt, though they taste bitter and are decidedly not a kitchen ingredient.

The name comes from the town of Epsom in Surrey, England, where the compound was first discovered in natural spring water in the early 1600s. Since then, Epsom salts have become a staple in homes worldwide — prized for their versatility, affordability, and gentle effectiveness.

When dissolved in water, the magnesium ions are released and readily absorbed through the skin, which is why a warm bath with Epsom salts can have such a noticeable effect on how you feel.

• Muscle relief: soaking in a warm bath with Epsom salts helps ease muscle soreness and stiffness, making them a favourite recovery tool for athletes and anyone on their feet all day.
• Reduces inflammation: magnesium plays a well-documented role in regulating inflammatory responses in the body, and Epsom salts offer a topical way to support this.
• Stress and sleep support: magnesium is essential for regulating neurotransmitters and the sleep hormone melatonin. An Epsom salt bath in the evening can promote a calmer, more restful night.
• Supports nerve and blood pressure function: magnesium helps regulate both nerve signalling and blood pressure — two areas where many people are unknowingly deficient.
• Foot care: soaking feet in warm water with Epsom salts softens skin, eases aching feet, and can help with fungal issues and odour.

One of the more surprising uses for Epsom salts is as a plant supplement. Magnesium is a core component of chlorophyll — the molecule that lets plants convert sunlight into energy — so magnesium-deficient soil leads to yellow leaves and stunted growth.