Skip to main content
SupplementScience
Conjugated Linoleic Acid (CLA) supplement
Fatty Acid

Conjugated Linoleic Acid (CLA): Benefits, Dosage, Forms & Research

Fatty Acid

This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer

TL;DR — Quick Answer

CLA at 3.2-6.4 g/day has shown modest fat loss (~0.05 kg/week) in a 2007 meta-analysis of 18 RCTs. Effects are small but consistent over 6-12 months. The t10,c12 isomer drives fat reduction. CLA does not typically reduce total body weight significantly but may shift body composition.

Key Facts

What it is
A group of fatty acid isomers that modulate fat storage and body composition
Primary benefits
  • Modest reduction in body fat mass
  • May improve body composition (fat-to-lean ratio)
  • Inhibits fat cell lipid uptake
  • Long-term safety data available
Typical dosage
3.2-6.4 g daily
Evidence level
Moderate
Safety profile
Generally Safe

What the Research Says

CLA has one of the larger evidence bases among weight management supplements, with 18+ RCTs and a comprehensive meta-analysis showing consistent but modest fat loss. The effect is small (~0.05 kg/week of fat loss) but statistically significant and maintained over long periods. CLA does not typically reduce scale weight dramatically because it may preserve lean mass. Safety concerns about insulin resistance and inflammatory markers warrant monitoring in at-risk populations.

Benefits of Conjugated Linoleic Acid (CLA)

  • Fat loss — Whigham et al. (2007, meta-analysis, 18 RCTs, n=795) found CLA at 3.2 g/day reduced fat mass by 0.05 kg/week vs placebo
  • Body composition — Blankson et al. (2000, n=60) showed CLA 3.4-6.8 g/day significantly reduced body fat mass without affecting lean mass over 12 weeks
  • Long-term effects — Gaullier et al. (2005, n=180) found CLA 3.4 g/day reduced body fat by 8.7% vs placebo over 12 months
  • Mechanism — t10,c12-CLA inhibits lipoprotein lipase and stearoyl-CoA desaturase, reducing fat storage in adipocytes
Did you know?

CLA has one of the larger evidence bases among weight management supplements, with 18+ RCTs and a comprehensive meta-analysis showing consistent but modest fat loss.

Forms of Conjugated Linoleic Acid (CLA)

FormBioavailabilityBest For
Tonalin CLA (80% CLA, 50:50 isomer ratio)HighMost clinically studied branded form from safflower oil
Clarinol CLAHighAnother well-studied branded CLA from safflower oil

Dosage Recommendations

General recommendation: 3.2-3.4 g CLA daily, divided with meals

Timing: Divide into 3 doses with main meals • Take with food for best absorption.

Dosage by Condition

ConditionRecommended DoseEvidence
Fat loss3.2-6.4 g daily with mealsModerate
Body composition3.4 g daily for 3-12 monthsModerate

Upper limit: 6.4 g/day has been used safely in trials; higher doses offer no additional benefit

Side Effects and Safety

Safety profile: Generally Safe

Potential Side Effects

  • GI discomfort (loose stools, bloating) in some users
  • May increase inflammatory markers (CRP) in some studies
  • Possible insulin resistance effect (t10,c12 isomer) — monitor if diabetic
  • Fatty liver concerns at very high doses in some animal studies

Drug & Supplement Interactions

  • Diabetes medications — t10,c12 isomer may affect insulin sensitivity
  • Anticoagulants — CLA may have mild platelet effects
Check Conjugated Linoleic Acid (CLA) interactions with other supplements →
BenefitsDosage GuideSide EffectsTypes & FormsResearchFAQ

Related Supplements

Green Tea Extract (EGCG)Caffeine (Weight Management)Capsaicin / Cayenne

Frequently Asked Questions

Does CLA actually help you lose weight?

CLA reduces body fat rather than total weight. The meta-analysis showed ~0.05 kg/week of fat loss, which translates to about 1 kg of fat over 5 months beyond what diet alone achieves. This is modest but consistent. Don't expect dramatic weight loss — CLA is a long-term body composition supplement, not a rapid weight loss solution.

How long does CLA take to work?

Most studies show measurable body fat reduction after 6-12 weeks of consistent use at 3.2+ g/day. The Gaullier 12-month study showed continued benefits over a full year. CLA works gradually — commit to at least 3 months before evaluating results.

Are there safety concerns with CLA?

At standard doses (3.2-3.4 g/day), CLA is generally well tolerated. Some concerns exist: the t10,c12 isomer may worsen insulin sensitivity in some people, and some studies show increased CRP (an inflammatory marker). These effects are typically mild. Monitor blood sugar if diabetic.

References

  1. (). Efficacy of conjugated linoleic acid for reducing fat mass: a meta-analysis in humans. American Journal of Clinical Nutrition. DOI
  2. (). Conjugated linoleic acid supplementation for 1 y reduces body fat mass in healthy overweight humans. American Journal of Clinical Nutrition. DOI