Mars Wellness Magnesium Spray Maximum Strength: The MG+ pain spray relief is the perfect way to help provide instant pain relief from achy joints or an intense workout. Our muscle pain spray is a homeopathic formula that enables our bodies to recover faster from aches and discomfort. This natural pain relief spray formula helps to provide instant relief for aches, pains, and inflammation from minor injuries, overexertion, and fatigue. Apply this magnesium for leg cramps thin layer to the affected area every 6 to 8 hours, not to exceed 3 applications in a 24-hour period. — Warnings: This magnesium spray for headaches is for external use only.