Best Form of CLA: How to Choose

CLA Forms Compared

Conjugated linoleic acid (CLA) is a naturally occurring fatty acid found in ruminant fats. Supplement manufacturers offer CLA in two main forms: triglyceride (TG) form and free fatty acid (FFA) form. Choosing the right CLA form matters more than most labels suggest.

The most widely sold products — including OstroVit CLA 1000 150caps, DY CLA Softgel Capsules, and OstroVit CLA + Green Tea + L-carnitine 90 caps — typically contain safflower-derived CLA isomers (predominantly c9,t11 and t10,c12) standardised to around 78–80% active CLA content.

Bioavailability Differences

The triglyceride form is the natural esterified state of CLA and is the predominant form found in food. Research suggests that TG-form CLA is absorbed efficiently through standard fat digestion pathways. The free fatty acid form is chemically more reactive and may be absorbed faster when taken in isolation, but the practical difference in overall absorption between well-formulated TG and FFA soft gels is modest under normal feeding conditions (Gaullier et al., 2005).

Both forms require co-ingestion with a fat-containing meal to maximise absorption. Taking CLA capsules on an empty stomach reduces micelle formation and limits uptake.

Cost per Effective Dose

Most research on body composition has used total daily CLA amounts of roughly 3–4 g of active isomers per day (Blankson et al., 2000). Read the label carefully: a product may state "1000 mg CLA per capsule" but the active CLA content depends on purity. A product at 80% purity delivers 800 mg active CLA per capsule, so you need at least four capsules daily to approach studied amounts.

When comparing price, calculate cost per gram of active CLA isomers, not per capsule or per gram of the blend.

Which CLA Form for Which Goal

• Body composition support: Both forms have been studied. A meta-analysis found a statistically significant, though modest, reduction in body fat mass with CLA supplementation over several weeks in overweight adults (Whigham et al., 2007). The effect size is small, and CLA is not a substitute for a calorie deficit.
• Convenience: Soft gels (TG form) are the most shelf-stable and widely available. Free fatty acid liquid CLA is less common and more prone to oxidation once opened.
• Stacking: CLA is often combined with L-carnitine or green tea extract. Products like OstroVit CLA + Green Tea + L-carnitine 90 caps deliver this combination in a single capsule.

What to Look for on the Label

1. Active CLA percentage: Look for "min. 78% CLA" or a direct gram amount of active isomers.
2. Isomer specification: The t10,c12 isomer is the one studied most for body composition. Most standardised extracts contain a mixture of c9,t11 and t10,c12.
3. Oil source: Safflower oil is the standard. Sunflower oil is also used.
4. Additives: Soft gel capsules use gelatin (not vegan). Some brands offer vegetarian encapsulation — check if this matters to you.
5. Storage: Keep away from direct sunlight and heat to prevent oxidation.

You can browse CLA products currently available at maxfit.ee/et/category/cla-kondenseeritud-linoolhape.

FAQ

Is CLA a stimulant?

No. CLA is a fatty acid and has no stimulant properties. It does not raise heart rate or blood pressure and can be taken in the evening.

Can I get enough CLA from food alone?

Grass-fed beef and full-fat dairy contain CLA naturally, but typical dietary intake is well below the amounts studied for body composition effects. Supplementation is the practical route for reaching studied dose ranges.

How long does it take for CLA to show results?

Research studies typically run 12 weeks or longer. Short-term trials of a few weeks show minimal change. Expect results only alongside consistent training and a calorie-controlled diet.

References

Gaullier, J. M., Halse, J., Hoye, K., Kristiansen, K., Fagertun, H., Vik, H., & Gudmundsen, O. (2005). Supplementation with conjugated linoleic acid for 24 months is well tolerated by and reduces body fat mass in healthy, overweight humans. Journal of Nutrition, 135(4), 778–784. https://pubmed.ncbi.nlm.nih.gov/15795434/

Blankson, H., Stakkestad, J. A., Fagertun, H., Thom, E., Wadstein, J., & Gudmundsen, O. (2000). Conjugated linoleic acid reduces body fat mass in overweight and obese humans. Journal of Nutrition, 130(12), 2943–2948. https://pubmed.ncbi.nlm.nih.gov/11110851/

Whigham, L. D., Watras, A. C., & Schoeller, D. A. (2007). Efficacy of conjugated linoleic acid for reducing fat mass: a meta-analysis in humans. American Journal of Clinical Nutrition, 85(5), 1203–1211. https://pubmed.ncbi.nlm.nih.gov/17490954/