Davis 1988.

Methods	Design: repeated measures parallel trial Method of allocation and concealment: random but method unclear Blinding: double blind Number of subjects at outset: unclear (see notes) Withdrawals: 2 (reasons unclear)
Participants	Inclusion: primary dysmenorrhoea with moderate to severe cramping, regular menstruation Exclusion: over the counter medication, vitamins or minerals, use of OCP or IUD, secondary dysmenorrhoea, health or reproductive problems Age: 18 to 35 years Location: college campus in Texas, USA
Interventions	Group 1: vitamin B6 200 mg daily (N = 10) Group 2: magnesium 500 mg daily (N = 13) Group 3: vitamin B6 200 mg plus magnesium 500 mg daily (N = 12 or 11) Group 4: pressed lactose placebo (N = 11) Duration: 5 consecutive cycles (1 pretreatment and 4 with treatment)
Outcomes	Menstrual pain scores; plasma mineral levels; symptom of stress inventory; erythrocyte magnesium levels; additional medication.
Notes	Dissertation On page 85 the study author states "only women with menstrual cramping {n=46} included", but on page 38 they state 47 women We are awaiting the full‐text article. We had difficulties with the interlibrary loan (November 2015)