I stopped taking tablets due to the adverse effects on my IBS, but didn’t experience any headaches. I now use magnesium oil which I rub in. Dr Mercola has written an extensive article on magnesium, but only mentions headaches as a sign of insufficient magnesium. Perhaps you could split the capsule and take it in divided doses - he suggests that as a method to avoid an upset stomach. He also has a recipe for a cheap skin rub. Not sure any of this is much help, I’m afraid.
Content on HealthUnlocked does not replace the relationship between you and doctors or other healthcare professionals nor the advice you receive from them.
Never delay seeking advice or dialling emergency services because of something that you have read on HealthUnlocked.