Hi, I have always suffered with cramp when I chainsaw for long periods. I was advised to try taking 500mg of magnesium a day. I’m not one for tablets and pills but. My word. Spent 5 hours today cutting a huge Ivey hedge from 7ft down to 3ft. No cramp, nothing! Amazing . So if any of you suffer , try these. About £9-12 per month for a supply!