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CLA

potential role in body composition and fat metabolism

Evidence · Grade B
Interaction risk

Conjugated Linoleic Acid (CLA) is a fatty acid found in ruminant animal products, often supplemented for its potential, though unconfirmed, role in body composition and fat metabolism.

Last reviewed June 5, 2026 · AI-assisted, human-reviewed
Conjugated Linoleic Acid (CLA) is a naturally occurring fatty acid found in meat and dairy products. It is often marketed as a weight-loss supplement due to its potential role in altering body composition by reducing fat mass.

Quick answer

What it is: Conjugated Linoleic Acid (CLA) is a naturally occurring fatty acid found in meat and dairy products.

May support:Obesity

Evidence:Evidence · Grade B

Evidence Summary

Evidence · Grade B

The current evidence for CLA's efficacy in humans, particularly for weight loss or body composition changes, is considered limited and inconsistent. This is primarily due to conflicting results from various human clinical trials, differences in study design, CLA isomer ratios used, dosages, and populations studied. Many positive findings are derived from animal or in vitro studies, which do not always translate to human outcomes.

Last reviewed · Jun 2026

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Why It Works

CLA is believed to affect fat metabolism through several mechanisms, including modulating lipogenesis (fat production) and lipolysis (fat breakdown). It may also influence energy expenditure and satiety, thereby contributing to a reduction in body fat. Isomers of CLA, particularly C9, T11-CLA and T10, C12-CLA, appear to have distinct biological activities.

How it works in more detail

The proposed mechanisms for CLA's effects on body composition are complex and not fully elucidated. In vitro and animal studies suggest that CLA, particularly the t10,c12 isomer, may inhibit lipoprotein lipase (an enzyme involved in fat uptake into adipocytes), decrease adipocyte differentiation and proliferation, and increase fatty acid oxidation in muscle cells. It may also influence the expression of genes related to lipid metabolism and energy expenditure. However, these mechanisms have not been consistently demonstrated or translated effectively in human clinical trials.

How to use

Always consult a qualified clinician.

Editorial guidance

Suggested dosage
3.2 grams per day, typically divided into two or three doses with meals.
Typical forms
capsule, softgel
Quality markers
When purchasing CLA supplements, look for products that specify the isomer content, particularly the t10,c12 and c9,t11 isomers. Reputable brands often provide third-party testing for purity and potency. Check for the source of CLA, commonly derived from safflower or sunflower oil.
Medication interactions
  • Anticoagulants (potential theoretical interaction due to fatty acid nature, though not well-established)
  • Antidiabetic medications (potential theoretical interaction due to effects on insulin sensitivity, though not well-established)

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Suggested dosage

3.2 grams per day, typically divided into two or three doses with meals.

General guidance — discuss specifics with a clinician.

Active medicinal compounds

Conjugated Linoleic Acid (CLA) isomers, primarily t10,c12-CLA and c9,t11-CLA.

Safety

Safety warnings

CLA is generally considered safe for most adults when taken at recommended dosages. Potential side effects can include gastrointestinal upset, nausea, and fatigue. Some studies have reported increased markers of oxidative stress or negative effects on lipid profiles in specific populations, though findings are inconsistent.

Medication interactions

  • Anticoagulants (potential theoretical interaction due to fatty acid nature, though not well-established)
  • Antidiabetic medications (potential theoretical interaction due to effects on insulin sensitivity, though not well-established)

Reported side effects

  • Nausea
  • Diarrhea
  • Stomach upset
  • Fatigue

General guidance — discuss specifics with a clinician.

Evidence ecosystem

Scientific literature, clinical guidance, government sources, ongoing research, traditional use, and lived experience — grouped by source type and quality.

No indexed evidence yet. We're still building out this remedy's evidence ecosystem.

Limitations: Key limitations include the inconsistency of human clinical trial results, often small sample sizes, short study durations, and variability in the specific CLA isomers and dosages used. The relevance of animal study findings to human physiology is also a significant limitation. There is a lack of large-scale, long-term, well-controlled human trials to definitively establish efficacy and safety.

This page is educational. Statements use phrases like "may support" and "has been studied for"because no remedy here is approved to cure, treat, or reverse any condition. Discussion happens on the ailment pages — community statistics here are derived from those reports. Always consult a qualified clinician.

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