What is conjugated linoleic acid (CLA)?

Conjugated linoleic acid (CLA) is a group of related polyunsaturated fatty acids naturally found in meat and dairy. It is also sold as a dietary supplement, often for body composition support.

Does CLA help with fat loss?

CLA may support modest reductions in body fat in some people, but effects are typically small and vary by individual. It is not a substitute for diet, exercise, and overall calorie balance.

What is a typical CLA dosage?

Common supplemental intakes are about 3–6 g per day. Doses are often split with meals to improve tolerability.

Can CLA help preserve muscle during weight loss?

Some research suggests CLA may help preserve lean mass during dieting, especially when combined with resistance training. Results are mixed and depend on the overall training and nutrition plan.

CLA is generally well tolerated for many adults, but some people experience gastrointestinal side effects. People who are pregnant, breastfeeding, or managing metabolic conditions should consult a clinician before use.

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Conjugated Linoleic
Acid

Moderate study situation·7/10

A higher score indicates better study conditions, but not necessarily effectiveness.

Conjugated linoleic acid (CLA) is a group of fatty acids found in meat and dairy, studied for modest effects on body composition and metabolic health.

Anti-inflammatory Cancer-inhibitor Muscle Gain Glucose Metabolism Weight Management

dose range

3–6 g

2–3 doses per day with meals

Consumption

Take with food to maximize absorption.

Fat-soluble: take with fat.

Best time

Divide doses between meals such as breakfast and lunch.

Description

CLA is a naturally occurring polyunsaturated fatty acid, present in meat and dairy products and often consumed as a supplement for weight management and metabolic support.

benefits

Main effects with level of evidence

Moderate

Note on evidence

Clinical evidence supports small benefits for body composition, but efficacy and safety vary by individual; effects on cancer and metabolism are still under investigation.

Supports modest reductions in body fat

Moderate

Supplemental CLA may help reduce body fat in overweight and obese individuals, though effects are typically small (about 0.05 kg/week).

Particularly relevant for: Overweight adults · Obese adults

S1 · Whigham LD et al., Effect of conjugated linoleic acid on body fat and energy metabolism in humans: a meta-analysis S5 · Examine.com - Conjugated Linoleic Acid

May preserve lean muscle mass during weight loss

Limited

Studies suggest CLA may help preserve lean body mass while dieting, particularly when paired with resistance training.

Particularly relevant for: Dieters · Athletes

S1 · Whigham LD et al., Effect of conjugated linoleic acid on body fat and energy metabolism in humans: a meta-analysis S5 · Examine.com - Conjugated Linoleic Acid

May improve some aspects of metabolic health

Mixed

CLA has been studied for effects on insulin sensitivity and lipid metabolism, showing mixed results, often strain-dependent and more pronounced in animal models than humans.

Particularly relevant for: Pre-diabetic individuals · Obese adults

S2 · Benjamin S, Spener F. Conjugated linoleic acids as functional food: an insight into their health benefits.S7 · Moloney F, Yeow TP, Mullen A, Nolan A, Roche HM. Conjugated linoleic acid supplementation, insulin sensitivity, and lipoprotein metabolism in healthy and obese humans.S8 · Polette M, Hellerstein MK, Reaven GM. An assessment of the effects of conjugated linoleic acid (CLA) on glucose tolerance and insulin action in obese men with metabolic syndrome.

Potential chemopreventive properties (preclinical)

Limited

Animal and preliminary human studies suggest CLA may have anti-cancer activity, but more evidence is needed before recommendations.

Particularly relevant for: General

S3 · Ip C et al., Conjugated linoleic acid suppresses mammary carcinogenesis and proliferative activity of the mammary gland in rodents.

Potential anti-inflammatory effects

Limited

There is some evidence from preclinical and early human trials that CLA exerts anti-inflammatory actions, but consistent clinical effects have not been robustly demonstrated.

Particularly relevant for: General · Metabolic syndrome

S2 · Benjamin S, Spener F. Conjugated linoleic acids as functional food: an insight into their health benefits.

Safety & Information

Important safety information & known risks

For educational purposes only • not medical advice

CLA is generally well-tolerated in healthy adults at typical supplemental doses, but may cause gastrointestinal upset, fatigue, or worsen insulin resistance in certain individuals.

warning notices

May cause gastrointestinal discomfort and diarrhea, especially at higher doses.
Fatigue has been occasionally reported.
Potential to worsen insulin resistance in some obese or diabetic individuals.
Insufficient data for use in pregnancy or breastfeeding; avoid in these groups.
Avoid use if pregnant or breastfeeding due to insufficient safety data.
Monitor blood glucose and insulin sensitivity if diabetic, prediabetic, or obese, as CLA may worsen insulin resistance in some individuals.
Avoid use alongside lipid-lowering medications (e.g., statins) without medical supervision.
Discontinue use if persistent gastrointestinal upset or fatigue occurs.

Known interactions with medications

Statins
Insulin-sensitizing medications

Contraindications / special precautions

Pregnancy
Breastfeeding
Severe metabolic syndrome without medical supervision

interactions

Important interactions between active ingredient ↔ supplement / medication / food

CLA may interact with drugs that affect lipid metabolism and glucose regulation.

CLA may interact with lipid-lowering drugs such as statins.

drug · Statins

CautionLimited

Why

Both CLA and statins impact lipid metabolism and liver function, which could increase the risk of adverse effects.

recommendation

Consult a healthcare provider if using both CLA and statins.

S6 · EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA), Scientific Opinion on the safety of conjugated linoleic acid (CLA)-rich oils as a novel food ingredient.

CLA may influence insulin resistance, particularly in obese and diabetic individuals.

drug · Insulin-sensitizing medications

MonitorLimited

Why

CLA may impair insulin sensitivity, potentially blunting the effect of some anti-diabetic drugs.

recommendation

Monitor blood glucose closely if combining CLA with anti-diabetic medications.

S8 · Polette M, Hellerstein MK, Reaven GM. An assessment of the effects of conjugated linoleic acid (CLA) on glucose tolerance and insulin action in obese men with metabolic syndrome.

mechanisms of action

Brief explanations of how it works

Modulation of lipid metabolism

CLA influences enzymes involved in fat oxidation and storage, potentially reducing body fat mass and altering lipid profiles.

S2 · Benjamin S, Spener F. Conjugated linoleic acids as functional food: an insight into their health benefits.S5 · Examine.com - Conjugated Linoleic Acid

Effects on insulin signaling

Certain CLA isomers can modify insulin sensitivity in adipose tissue and muscle, with strain- and dose-dependent effects.

Potential anti-inflammatory and immune modulation

CLA may modulate cytokine production and inflammation, as observed in animal models, but human results are variable.

S2 · Benjamin S, Spener F. Conjugated linoleic acids as functional food: an insight into their health benefits.

Possible anticarcinogenic actions

CLA has shown the ability to inhibit tumorigenesis in preclinical models, though mechanisms in humans remain unclear.

S3 · Ip C et al., Conjugated linoleic acid suppresses mammary carcinogenesis and proliferative activity of the mammary gland in rodents.

Sources & References

Primary literature and reviews on which these statements are based

8 sources

Whigham LD et al., Effect of conjugated linoleic acid on body fat and energy metabolism in humans: a meta-analysis

Meta-analysis on CLA's effect on body composition.

Benjamin S, Spener F. Conjugated linoleic acids as functional food: an insight into their health benefits.

Comprehensive review of CLA's effects on metabolic health.

Ip C et al., Conjugated linoleic acid suppresses mammary carcinogenesis and proliferative activity of the mammary gland in rodents.

Animal study on CLA's anticancer properties.

US NIH ODS: Linoleic Acid

Official dietary fact sheet on linoleic acids.

Examine.com - Conjugated Linoleic Acid

Evidence review of CLA's efficacy and safety.

EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA), Scientific Opinion on the safety of conjugated linoleic acid (CLA)-rich oils as a novel food ingredient.

European safety assessment of CLA supplements.

Moloney F, Yeow TP, Mullen A, Nolan A, Roche HM. Conjugated linoleic acid supplementation, insulin sensitivity, and lipoprotein metabolism in healthy and obese humans.

Human study on CLA's metabolic effects.

Polette M, Hellerstein MK, Reaven GM. An assessment of the effects of conjugated linoleic acid (CLA) on glucose tolerance and insulin action in obese men with metabolic syndrome.

Study on insulin sensitivity effects in obese individuals.

Last updated: February 7, 2026

This information is for educational purposes only and does not replace medical advice.