Be careful with this. I had been using the cream on my son who is diagnosed with ADHD and LD. He did ok with it for a while using a very small amount (much less than the recommended dosage). One night I used a bit more than I had been using previously (still less than the recommended dosage) and he had a bad reaction to it. He got very sick to his stomach, almost vomited and had an asthma attack. It started 5-10 minutes after I applied the cream to his arm. The cream was from a very reputable company so I doubt there was anything wrong with it. When I looked up the side effects to oral magnesium sulfate, I was alarmed. I thought this cream was completely safe and harmless.