What to take for migraine frequency
Graded by the strength of the evidence — strongest first. Nothing here is sold to you.
Magnesiumgrade C— 10 oral-magnesium RCTs (n=789): reduced migraine frequency and intensity vs. placebo (odds ratios 0.20 and 0.27, no CIs given); some trials had inadequate randomization per the review authors. A separate IV arm covered acute attacks, not prevention.