What is CLA?
CLA or conjugated linoleic acid is a naturally occurring trans fatty acid found in dairy products, beef and lamb. Unlike industrial trans fats, CLA is natural and has scientifically proven health benefits.
CLA is actually a group of fatty acids — with the same chemical formula but different double bond positions. The two main forms are:
- cis-9, trans-11 — the most common natural form (about 80% of natural CLA)
- trans-10, cis-12 — the main form affecting body composition
Supplemental CLA is typically derived from safflower oil and contains both forms in equal proportions.
Benefits of CLA
Body Composition Improvement
The strongest scientific evidence for CLA relates to its effects on body composition.
The Whigham et al. (2007) meta-analysis reviewed 18 controlled studies and found that CLA:
- Reduces body fat by approximately 0.09 kg per week (compared to placebo)
- The effect is modest but statistically significant
- Best results appear after at least 6 months of consistent use
Lean Muscle Preservation
One of CLA's most interesting properties is its ability to preserve lean muscle mass during calorie deficit:
- Supports muscle retention during dieting
- Helps improve the fat-to-muscle ratio
- Particularly useful during weight-loss phases
Immune System Support
Some studies indicate that CLA may support immune function:
- Modulates inflammatory markers
- Supports immune cell activity
- Antioxidant effects
Setting Realistic Expectations
CLA is NOT a miracle fat burner. It is important to set realistic expectations:
- Average fat loss: ~0.09 kg per week more than without CLA
- This means roughly 2 kg more fat loss over 6 months
- CLA works best combined with exercise and balanced nutrition
- It does not replace diet or exercise on its own
CLA is a supportive supplement, not a primary fat burner.
CLA Sources
Natural Sources
| Source | CLA Content |
|--------|-------------|
| Lamb | 5.6 mg/g fat |
| Beef | 4.3 mg/g fat |
| Cheese | 3.6 mg/g fat |
| Milk | 5.5 mg/g fat |
| Yogurt | 4.8 mg/g fat |
The amount of CLA obtained from natural food is typically too low for therapeutic effects (~150-250 mg daily).
Supplements
- Derived from safflower oil through a chemical process
- Contain a 50:50 blend of the two main CLA forms
- Doses standardized to CLA content (typically 80%)
Dosing
| Goal | Dose | Notes |
|---|---|---|
| Body composition | 3-6g daily | Split into 3 doses with meals |
| Fat loss support | 3.2-6.4g daily | Minimum 3 months |
| General health | 1.5-3g daily | Long-term |
Recommendations:
- Take CLA with meals — this improves absorption
- Split the dose 2-3 times throughout the day
- Minimum use period to see results: 8-12 weeks
Who Should Take It?
Best choice for
- People losing weight — wanting to support fat loss alongside training
- Body-composition-conscious athletes — to preserve muscle during cutting phases
- People on low-calorie diets — additional fat loss support
Combining with Exercise
CLA delivers best results when combined with resistance training and cardio:
- Resistance training helps preserve muscle mass
- Cardio increases caloric deficit
- CLA supports both effects
Side Effects
CLA is generally well tolerated, but some side effects are possible:
Most common (mild):
- Digestive issues (stomach pain, diarrhea, nausea)
- Bloating
- Usually resolve within 1-2 weeks
Long-term use considerations:
- Some studies suggest CLA may reduce HDL cholesterol
- May increase liver fat in some individuals
- Effects on insulin sensitivity are contradictory across studies
Important notes:
- People with diabetes should consult a doctor
- Insufficient safety data for pregnant and breastfeeding women
- People with liver damage risk factors should be cautious
Our Recommendation
For Weight Loss Support
1. 3.2g CLA daily, split into 3 doses with meals
2. Combine with resistance training and cardio
3. Follow a balanced caloric deficit
4. Use for at least 12 weeks consistently
5. CLA is a supporting supplement, not a replacement for training and diet
For Body Composition
1. 3-6g CLA daily
2. Combine with resistance training (at least 3x per week)
3. Ensure adequate protein intake (1.6-2.2g/kg body weight)
Explore our CLA selection and fat burners.
Summary
CLA is a scientifically studied supplement with a modest but statistically significant effect on body composition.
Key benefits:
- Supports fat loss (approximately 0.09 kg more per week)
- Helps preserve lean muscle during caloric deficit
- Naturally occurring fatty acid
Key points:
- Dose of 3-6g daily, split across 2-3 meals
- Not a miracle pill — works alongside training and diet
- Minimum 8-12 weeks of consistent use
- Generally safe, but consult a doctor if you have health concerns
See also:
- CLA (Conjugated Linoleic Acid): The Science of Fat Reduction
- Best Supplement Stacks for Fat Loss in 2026
- L-Carnitine for Fat Burning: Does It Actually Work?
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Read more: Fat Burners: A Science-Based Guide
