There are certain individuals who should not use an ionic foot bath due to potential risks such as: Pregnant women may face complications and hormonal changes. People with kidney problems should avoid using an ionic foot bath. Those on blood thinners may experience increased bleeding risk. Severely dehydrated patients may further exacerbate their condition. Individuals allergic to certain ingredients used in these baths should also abstain. These groups should consult a healthcare provider before using an ionic foot bath.