One to two cups of Epsom salt per bath is enough for a standard-sized bathtub. Larger bathtubs may require more salt, and smaller tubs may need less. Individuals who haven't previously tried Epsom salt can add a small amount to a bath before using more.
Epsom salt is often used in bath water to alleviate sore muscles, soften the skin and reduce stress. It can be added directly to bath water or mixed with essential oils such as lavender. While Epsom salt baths can be soothing, it is best to limit them to a few times a week to avoid drying out the skin.