| Study | Reason for exclusion |
|---|---|
| Cady 2011 | Combination product of feverfew and ginger used |
| Ferro 2012 | No placebo comparator; acupuncture compared with feverfew or combined treatment |
| IRCT2014081218776N1 2015 | Combination product of feverfew and lavender |
| Karimooy 2011 | Available as abstract only; further details requested from author but not received. Unclear whether randomised; unclear whether prevention of migraine |
| Kuritzky 1994 | No clinical outcomes reported |
| Maizels 2004 | Combination product of riboflavin, magnesium and feverfew |
| Trader 2007 | Not randomised, n‐of‐1 trial |
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