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| Study | Reason for exclusion |
|---|---|
| Abendroth 1992 | No relevant outcomes |
| Agarwal 2004a | No relevant outcomes |
| ATIC Study 2005 | Not RCT |
| Blackhall 2005 | Cross‐over study design |
| Mune 1999 | No relevant outcomes |
| Noel 2000 | No relevant outcomes |
| Panzetta 1995 | Not RCT |
| Perkins 2009 | No relevant outcomes |
| Schneeberger 1989 | No relevant outcomes |
| Schramm 2002 | No relevant outcomes |
| Wlodarczyk 2000 | The main mechanism of action of the intervention used was not antioxidation |
| Yukawa 1995 | Not RCT |
RCT ‐ randomised controlled trial
