Xu YS 1997.

Methods	Generation of allocation sequence: unstated. Blinding: not used. Sample size estimation: no information. Withdrawal/drop‐out: unstated.
Participants	Ethnic: Chinese; 116 patients (60 in treatment group, M/F 29/31, mean age 57 years, disease duration from 1‐15 years; 56 in control group, no details on gender, age, and disease duration). Setting: outpatients. Inclusion criteria: type 2 diabetes mellitus, diagnosed by WHO criteria (WHO 1980). Exclusion criteria: unstated.
Interventions	Experimental intervention: Zhonghui Chuanhuang Ye (extracts from more than 10 herbs) liquid, 10 ml orally, t.i.d., for two months. During this intervention, patients maintained original hypoglycaemic and dietary treatments. Control intervention: patients maintaining their original hypoglycaemic and dietary treatments, for two months.
Outcomes	FBG. No follow‐up was reported.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear