CLA (Conjugated Linoleic Acid): Uses, Benefits, Dosage & Safety

Last updated: June 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy

What is CLA (Conjugated Linoleic Acid)?

Conjugated linoleic acid (CLA) is a group of fatty acids found naturally in dairy and ruminant meat. Supplements (usually from safflower oil) are marketed for fat loss, body composition and 'toning', and were very popular in fitness circles.

What CLA (Conjugated Linoleic Acid) is commonly used for

In supplements, CLA (Conjugated Linoleic Acid) is most often included for weight & metabolism support. It is used as nutritional support, not as a treatment for any medical condition — the distinction matters, because the claims on a sales page are often stronger than the evidence allows.

How CLA (Conjugated Linoleic Acid) works

CLA is proposed to influence fat metabolism, fat-cell formation and energy expenditure. The supplement isomers differ from those in food, and the effects seen in animals have translated poorly and inconsistently to humans.

What the evidence says

Here's an honest snapshot of what published research suggests about CLA (Conjugated Linoleic Acid) — including where the evidence is limited.

• Human trials show, at best, small and inconsistent reductions in body fat from CLA, with little practical impact. (PubMed research)
• Some studies of high-dose CLA raised concerns about insulin resistance, inflammation and liver fat, so the risk-benefit is unattractive. (PubMed research)

Typical dosage used in studies

Studies have used roughly 3-6 g/day of CLA. This is research information for context, not a recommendation — confirm what's appropriate for you with a healthcare professional.

Side effects and safety

Common side effects are digestive upset. Higher-dose, long-term use has been linked in some research to unfavourable metabolic changes.

Medication interactions and who should avoid CLA (Conjugated Linoleic Acid)

Sources & further reading

The summary above is drawn from peer-reviewed research and authoritative references. For general, authoritative background you can also consult:

• PubMed research on CLA (Conjugated Linoleic Acid)
• NIH Office of Dietary Supplements
• NIH National Center for Complementary and Integrative Health
• MedlinePlus (U.S. National Library of Medicine)

Frequently asked questions

Does CLA burn fat?

Human results are small and inconsistent — far less impressive than the marketing.

Is CLA safe?

Digestive upset is common; high-dose long-term use has raised some metabolic concerns.

Where is CLA found naturally?

In dairy and meat from ruminant animals like cows.

Is supplement CLA the same as in food?

Not exactly — supplements use different isomer ratios than natural CLA.