Study	Reason for exclusion
Bostick 2000	There was no discrimination in the outcomes for hypertensive or normotensive participants. "Persons with or without hypertension or hypercholesterolaemia, or taking or not taking antihypertensive or cholesterol‐lowering medications were eligible to participate except as specified below".
Das 2017	Wrong comparator
Dwyer 1998	Number of cases in each cross‐over step were not reported.
Eftekhari 2009	Low fat, high fibre diet was a co‐intervention.
Ferreira 2016	Wrong comparator
Hofmeyr 2015	Wrong patient population
Luft 1986	Quasi‐randomised trial
Morris 1988	No details of number of participants in calcium placebo groups
Ong 2016	Wrong study design
Pan 1993	Most participants (63%) were taking antihypertensive drugs.
Pan 2000	Blood pressure is not an outcome of the study.
Rahman 2003	Wrong study design
Sakai 2017	Wrong comparator
Shalileh 2010	Energy‐restricted diet was a co‐intervention.
Smith 1987	Quasi‐randomised study. It used even and odd numbers from a table of random numbers.
Weinberge 1993	Salt‐sensitive or salt‐resistant participants. No details of number of participants in calcium placebo groups
Zhang 2009	Wrong comparator