The effects of a Melissa officinalis L. based product on metabolic parameters in patients with type 2 diabetes mellitus: A randomized double-blinded controlled clinical trial.

Background Diabetic patients are at increased risk for coronary artery disease. Since phytotherapy has been greatly common, finding safe and effective treatments is of importance. This study aimed to evaluate the effects of a Melissa officinalis L. based product (MO) in patients with type 2 diabetes. Methods A randomized double-blinded controlled study was conducted with 37 dyslipidemic diabetic patients, assigned to either MO or placebo (P) groups receiving two 500 mg capsules daily for 3 months. Finally, 32 cases completed the study and were included in the analysis; MO (n=16) and P (n=16). Results Safe and significant effects in terms of decreasing the serum level of triglyceride (TG) in all patients after 2 months (p-value=0.02) and in patients with higher baseline serum levels of TG (TG≥200 mg/dl) after 3 months (p-value=0.04) were shown in the MO group. However, no metabolic significant changes were seen compared to the control group. Significant decrease in both systolic and diastolic blood pressure from baseline values were also found in patients with higher systolic blood pressure (SBP≥130 mmHg) (p-value=0.02) and those with higher diastolic blood pressure (DBP≥85 mmHg) (p-value=0.02) in the MO group. Conclusion This study showed that MO might be safe and beneficial in decreasing the serum TG level in dyslipidemic diabetic patients. Although, larger long-term studies are required.