- Many dietary supplements can negatively impact kidney function, especially in those with pre-existing kidney issues. Vitamins C and B6, minerals like potassium and magnesium, and herbs such as licorice, ephedra, and pennyroyal have all been shown to increase risk of kidney stones, damage, or failure when consumed in large amounts or long-term by those with poor kidney health. People with kidney disease need to carefully consider any supplements and limit or avoid those that are potentially harmful to their renal health.