The tablets used were different colours. Has it crossed anyone's mind that it might have been the colouring in the tablets and not the folate that caused the insignificant rise in breast cancer? Some excipients in medicines are responsible for side-effects in sensitive people, such as lactose. Azo dyes are known to be carcinogenic. Can the authors confirm whether all the colourings used in this trial are known to be safe?
Competing interests: None declared
Competing interests: No competing interests