Fig. 1From: Effectiveness of a fortified drink in improving B vitamin biomarkers in older adults: a controlled intervention trialCONSORT flow diagram for opti-age food intervention study. *Participant discontinued taking the drinks as they travelled abroad frequently and were unable to take drinks with them. +One participant who discontinued taking the drinks provided a blood sample at a debriefing appointment which was included in the intention-to-treat analysisBack to article page