Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote: “Randomization was done by listing all selected children, assigning them with random numbers, and dividing the odd numbers from the even numbers to form the 2 groups.”
		Comment: Adequately done
Allocation concealment (selection bias)	Low risk	Quote: “Randomization was done by listing all selected children, assigning them with random numbers, and dividing the odd numbers from the even numbers to form the 2 groups.”
		Comment: Adequately done
Blinding of participants and personnel (performance bias)	Low risk	Quote: “One shastho shebika was assigned per school to prepare and distribute the drink. Students did not know whether the blue or yellow Coloured sachets contained the fortified beverage”
		Comment: Adequately done
Blinding of outcome assessment (detection bias)	Low risk	Quote: “Researchers, schoolteachers, shasthoshebikas, and students did not know whether the blue or yellow Coloured
		sachets contained the fortified beverage.” “The decoding was done only by the manufacturer after the study was completed and the data analysed.”
		Comment: Adequately done
Incomplete outcome data (attrition bias)	Low risk	Comment:
		Group 1: 77/559
		Grup 2: 59/566
Selective reporting (reporting bias)	Unclear risk	Comment: Trial registration not reported. Outcomes specified in the methodology section were reported
Other bias	Low risk	Comment: No other biases detected.