2026 Diet Supplement Comparison — Garcinia, CLA, and Green Tea Extract

Key Summary Diet supplements can support diet and exercise, but they do not replace either one. Evidence strength: Green Tea Extract (EGCG) > CLA > Garcinia Cambogia. None of these supplements produces meaningful results without lifestyle changes. In clinical trials, the average additional weight loss from these supplements is 0.5-1.5kg over 12 weeks.

Market Overview — 2026 The global weight management supplement market continues to grow, and Garcinia Cambogia, CLA, and EGCG remain among the most searched and widely purchased ingredients.

1. Garcinia Cambogia

Active Ingredient and Mechanism The key compound is HCA (Hydroxycitric Acid), which is extracted from the fruit rind. | Mechanism | Description |

Scientific Evidence - Small short-term studies: ~0.88kg greater weight loss vs placebo

• Systematic reviews: Statistically significant but clinically modest effect
• FDA: Has issued safety warnings for some products
• Evidence level: Low to moderate

Dosing and Usage - Recommended: 1,500-3,000mg HCA per day

• Take 30-60 minutes before meals, on an empty stomach
• Suggested cycle: Maximum 12 weeks

Side Effects and Precautions - GI discomfort, including nausea and diarrhea, has been reported

• Cases of hepatotoxicity have been documented with high-dose, long-term use
• Avoid during pregnancy and breastfeeding
• May interact with diabetes medications and statins

2. CLA (Conjugated Linoleic Acid)

Active Ingredient and Mechanism CLA is an omega-6 fatty acid naturally found in dairy and beef. In supplements, it is commonly extracted from safflower oil. | Mechanism | Description |

Scientific Evidence - Cochrane meta-analysis: ~0.1kg body fat loss per week

• Long-term studies: Show reductions in body fat percentage with lean mass preservation
• Evidence level: Moderate — stronger than Garcinia

Dosing and Usage - Recommended: 3-6g per day

• Take with meals to improve absorption
• Results typically require 12+ weeks

Side Effects and Precautions - Initial GI discomfort, such as nausea or stomach pain

• Some studies report increased insulin resistance at high doses
• May affect lipid profile (LDL cholesterol) — monitor if you are at risk
• Use caution if taking blood glucose medications

3. Green Tea Extract (EGCG)

Active Ingredient and Mechanism EGCG (Epigallocatechin Gallate) is the main catechin in green tea and the best-researched weight management ingredient among these three options. | Mechanism | Description |

Scientific Evidence - Cochrane meta-analysis: 0.2-0.5kg weight reduction over 12 weeks

• Metabolic rate increase: ~60-80kcal/day additional calorie burn
• Evidence level: Highest of the three

Dosing and Usage - Recommended: 250-500mg EGCG per day

• One cup of green tea provides ~50-100mg EGCG, so 3-5 cups are needed to match supplement doses
• Take 30 minutes before meals
• Works synergistically with caffeine for a stronger effect

Side Effects and Precautions - Caffeine-sensitive individuals may experience palpitations or insomnia

• GI discomfort can occur when taken on an empty stomach
• High-dose, long-term use has been linked to elevated liver enzymes
• May inhibit iron absorption, which is a concern for people with anemia

Comprehensive Comparison Table | Feature | Garcinia | CLA | Green Tea (EGCG) |

Which Supplement is Right for You? | Your Situation | Recommended |

Important Warnings 1. Supplements are supplements: Without a calorie deficit and exercise, none of these produces meaningful results.

1. 1Regulatory status: In Korea, check for MFDS functional ingredient certification. All three are certified.
2. 2Drug interactions: If you take blood pressure, diabetes, or anticoagulant medications, consult a doctor or pharmacist first.
3. 3Realistic expectations: Average additional weight loss is 0.5-1.5kg over 12 weeks. These are modest adjuncts, not dramatic solutions. > 💡 Check your BMI and recommended weight range using our BMI Calculator with Asian-specific cutoff values. --- > 📣 Disclosure: This post is for health information purposes only. No specific product brands are endorsed, and no advertising fees were received. Always consult a physician or pharmacist before starting any supplement. This content does not constitute medical advice. ---

FAQ Q1. Can I take Garcinia, CLA, and green tea extract together? A. No dangerous interactions have been documented, but taking multiple supplements at once makes it harder to identify the cause of side effects. Try one at a time and monitor your response. Q2. How much additional weight loss can I realistically expect? A. Clinical trials show 0.5-1.5kg additional loss over 12 weeks compared with placebo. That is a modest effect. Meaningful weight loss still requires dietary restriction and exercise. Q3. Can I replace EGCG supplements with just drinking green tea? A. Yes. Drinking 3-5 cups daily can provide supplement-level EGCG doses, but it also significantly increases caffeine intake. Q4. Will stopping supplements cause rebound weight gain? A. Supplements themselves do not cause rebound weight gain. If you return to previous eating and activity habits after stopping, the weight may come back. That is a lifestyle issue, not a supplement withdrawal effect. Q5. Is CLA safe for people with dairy allergies? A. Supplemental CLA is typically extracted from safflower oil, not dairy, so it should be dairy-free. Always check the product ingredient label to confirm. Q6. Can supplements help prevent muscle loss during dieting? A. CLA has some research support for lean mass preservation. The most effective strategies remain adequate protein intake and resistance training. Q7. Are these supplements safe for caffeine-sensitive people? A. CLA contains no caffeine. Garcinia is generally caffeine-free. Green tea extract contains EGCG and may be paired with caffeine, so choose decaffeinated formulas if you are caffeine-sensitive. Q8. Are these supplements safe during pregnancy or breastfeeding? A. None of the three — Garcinia, CLA, or green tea extract — is recommended during pregnancy or breastfeeding. Always consult your OB/GYN before taking any supplement during these periods.