Benefits
Body weight and BMI reduction
In a 12-week placebo-controlled trial of 500 mg a day (60 adults with overweight completed; a single maker-funded trial), weight fell about 2.6 kg on CGA-7 versus a 0.7 kg gain on placebo, with lower BMI and body fat. Independent meta-analyses of green coffee extracts found smaller average effects, about 1.2 to 1.3 kg.
Triglyceride reduction
In the branded trial, triglycerides fell from about 124 to 116 mg/dL, a change that differed from placebo, while total, LDL and HDL cholesterol changes did not differ from placebo. Pooled green coffee trials found a small drop in total cholesterol, with other lipid results seen only in some subgroups.
Fasting glucose and insulin in pooled green coffee trials
A meta-analysis of 14 mostly small trials with 766 people found that green coffee extract lowered fasting blood glucose and insulin slightly. These trials used other green coffee extracts, and CGA-7 itself has not been tested for blood sugar outcomes in a published trial.
Blood pressure: small reduction in pooled green coffee trials
A meta-analysis of 10 trials with 563 people found green coffee extract lowered systolic blood pressure by about 3 mmHg and diastolic by about 2 mmHg, with larger effects in people with higher starting blood pressure and no effect on heart rate. The pooled trials used other green coffee extracts, not CGA-7.
Mechanism of action
Glucose absorption and metabolism
In laboratory and animal studies, chlorogenic acids slow glucose absorption from the gut and affect liver enzymes that release glucose, which is the proposed basis for the small glucose and insulin changes seen in pooled human trials.
Fat metabolism
In animal studies, chlorogenic acids reduce fat storage and influence fat metabolism; the CGA-7 trial found lower body fat and triglycerides, but it did not measure how the extract works.
Clinical trials
Randomized, double-blind, placebo-controlled trial of 250 mg twice daily for 12 weeks; funded by Vidya Herbs, both authors are company employees, and the trial was registered after it began (Sudeep et al. 2021, SAGE Open Med).
71 adults aged 18 to 60 with a BMI of 25 to 30 randomized; 60 completed (33 CGA-7, 27 placebo).
Weight fell 2.63 kg on CGA-7 versus a 0.67 kg gain on placebo; BMI, body fat percentage (DEXA) and fat mass also fell versus placebo. Triglycerides dropped more than on placebo, but total, LDL and HDL cholesterol changes did not differ from placebo. Only completers were analysed. No adverse effects were reported.
Systematic review and dose-response meta-analysis of 15 randomized trials with 897 participants (Asbaghi et al. 2020, Complement Ther Med).
Adults in randomized trials of green coffee extract (not CGA-7 specifically).
Body weight was 1.23 kg lower, BMI 0.48 lower and waist 1.0 cm smaller than control. Body fat percentage and waist-to-hip ratio did not change significantly, and the chlorogenic acid dose was not linked to the size of the effect.
Systematic review and dose-response meta-analysis of 10 randomized trials with 563 participants (Samavat et al. 2024, Diabetes Metab Syndr).
Adults in randomized trials of green coffee bean extract (not CGA-7 specifically).
Systolic blood pressure fell by 2.95 mmHg and diastolic by 2.15 mmHg versus control, with larger effects in people with higher starting blood pressure and no effect in women; heart rate did not change. Dose and duration were not linked to the size of the effect.