Supporters believe the soap’s scent, ingredients, or simply the sensation may help calm uncomfortable legs. Lavender-scented soap is especially popular because its fragrance is often associated with relaxation and better sleep.
However, there is no strong scientific evidence showing that soap actually prevents leg cramps. Some people may feel better because the routine helps them relax or because they expect the remedy to work.
For those who want to try it, a plain or lightly scented dry bar is usually used. People with sensitive skin should avoid strongly perfumed soaps, especially if the soap may touch the skin directly.