Submitted in partial compliance with the requirements of the Master’s Degree in Technology: Homoeopathy, Durban University of Technology, Durban, South Africa, 2016, / Background Diabetes mellitus is a metabolic disorder with various aetiologies, characterised by hyperglycaemia, resulting from defects of carbohydrate, fat and protein metabolism due to the deficient action of insulin on target tissues caused by insensitivity to or lack of insulin or both. The long term effects of diabetes mellitus frequently include retinopathy, nephropathy and neuropathy and an increased risk of other diseases such as cardiac, peripheral arterial and cerebrovascular disease. According to the International Diabetes Federation (IDF) 387 million people have diabetes mellitus and this number is predicted to rise to 592 million worldwide by 2035. In 2014 diabetes mellitus caused 4.9 million deaths worldwide and every 7 seconds a person dies from diabetes mellitus. The growing incidence of diabetes mellitus is a worldwide concern because of the increase of economic costs and burden of disease that is due to the cardiovascular complications and the co-morbidities. Objective The aim of this double-blind, randomised clinical trial was to determine the efficacy of Syzygium jambolanum (Java plum) 6CH and Syzygium jambolanum (Java plum) homoeopathic mother tincture on daily fasting blood glucose and glycosylated haemoglobin levels in type 2 diabetes mellitus patients on Metformin® in the treatment of type 2 diabetes mellitus. Material and Method A sample consisted of 24 volunteers selected on the basis of inclusion and exclusion criteria. These participants were then randomly divided into two groups, 13 in the group receiving the homoeopathic potency and 11 in the group receiving the homoeopathic mother tincture. Each participant attended a total of five consultations with the researcher over a period of 14 weeks that included a 2 week baseline period followed by a 12 week treatment period, at the Durban University of Technology (DUT) or Kenneth Gardens Homoeopathic Day Clinic. At each consultation a detailed and comprehensive homoeopathic case history (Appendix D) was taken and a physical examination (Appendix E) was performed by the researcher. Participants were required to fill in a log sheet (Appendix C1 and C2) with their fasting blood glucose readings daily for 14 weeks, which included a 2 week baseline period followed by a 12 week treatment period. Participants were also required to have their glycosylated haemoglobin measurements tested pre- and post-treatment. Results Both groups reflected a statistically significant reduction in fasting blood glucose levels as compared to the baseline. The mean fasting blood glucose level in week 1 was 11.8802 whereas in week 13 the mean blood glucose level was 8.6590 with a p value ≤ 0.05 for the Syzygium jambolanum 6CH group and the mean blood glucose level in week 1 was 9.0338 with a standard whereas in week 13 the mean blood glucose level was 6.8591 with a p value ≤ 0.05 in the Syzygium jambolanum homoeopathic mother tincture. However there was no significant differences between the two groups (Syzygium jambolanum 6CH and Syzygium jambolanum homoeopathic mother tincture), the significance score was 0.623 when comparing reduction in fasting blood glucose levels. Both groups reflected a statistically non-significant reduction in the glycosylated haemoglobin (HbA1C) and there were no significant differences between the two groups when comparing reduction in HbA1C levels. Conclusion Both homoeopathic preparations of Syzygium jambolanum (mother tincture and 6CH) significantly reduce fasting blood glucose levels in patients with type 2 diabetes mellitus. This result suggests that Syzygium jambolanum has beneficial anti-diabetic effects and warrants further investigation. / M