NCT04801485.

Study name	Myo‐inositol in prevention of gestational diabetes mellitus in China
Methods	Study type: randomised, double‐centred, placebo‐controlled study
Participants	Inclusion criteria: 360 pregnant women who is in high risk for gestational diabetes
Interventions	Intervention: myo‐inositol 1 gram per day as well as health guidance about diet and exercise. From recruitment until OGTT Control: placebo (similar appearance but not containing myo‐inositol) 1 gram per day before meals. Similar health guidance about diet and exercise. From recruitment until OGTT
Outcomes	Primary outcome: gestational diabetes Secondary outcome: macrosomia, weight gain during pregnancy, caesarean‐section incidence
Starting date	1 January 2021
Contact information	Danqing Chen Chendq@zju.edu.cn
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