Natural Food Sources of CLA
Conjugated linoleic acid (CLA) is a naturally occurring fatty acid found predominantly in the fat of ruminant animals. Unlike synthetic fatty acids, CLA from food sources of CLA comes pre-packaged with other beneficial lipids, and the dietary form is identical in structure to what supplement makers isolate.
Top Food Sources of CLA
The richest CLA food sources are all ruminant-derived:
| Food | Approximate CLA content |
|---|---|
| Grass-fed beef (fatty cut) | ~4β6 mg per gram of fat |
| Lamb | ~4β5 mg per gram of fat |
| Full-fat cow's milk | ~1β2 mg per gram of fat |
| Butter | ~4β6 mg per gram of fat |
| Hard cheese (e.g. Gouda) | ~3β5 mg per gram of fat |
| Ghee | ~4β7 mg per gram of fat |
Grass-fed or pasture-raised animals consistently produce meat and dairy with higher CLA levels than grain-fed counterparts β a difference driven by rumen bacterial synthesis and the animal's own adipose metabolism (Bauman et al., 2006).
Poultry, eggs, and plant oils contain negligible amounts. Sunflower and safflower oils do supply the precursor linoleic acid but do not convert meaningfully to CLA in the human body.
Bioavailability: Food vs Supplement
CLA from food is well absorbed. The fatty-acid matrix of whole dairy and meat slows lipid digestion slightly, which may favour a steadier plasma appearance compared to isolated softgels, though head-to-head human bioavailability data in free-living conditions remain limited.
Supplements (typically as triglyceride or free fatty acid esters) deliver concentrated doses β often around 1 g of CLA isomers per softgel. The isomer ratio in supplements (c9,t11 vs t10,c12) differs from food: natural dairy is dominated by the c9,t11 isomer (roughly 75β80% of total CLA), while commercial supplements derived from sunflower oil often contain near-equal amounts of both isomers. Some research suggests the two isomers have distinct physiological effects, so the food matrix genuinely matters.
Daily Targets from Diet
The typical Western diet provides modest amounts of CLA. A mixed diet including two to three servings of dairy and one to two servings of ruminant meat daily can supply a meaningful intake, though reaching the higher doses used in supplement trials through food alone is difficult without very high fat intake.
There is no established dietary reference intake for CLA, so specific gram targets cannot be responsibly cited here. What matters practically is favouring grass-fed or pasture-raised animal products when budget and availability allow.
Cooking and Storage Effects
Heat affects CLA. Boiling, roasting, and frying at moderate temperatures have minimal impact on CLA content, but very high temperatures β such as prolonged deep-frying β can cause some isomerisation or oxidative loss (Shantha et al., 2004). Storing butter or cheese in the refrigerator away from light also preserves CLA content well. Avoid repeatedly reheating fatty dairy products.
Fermented dairy such as yogurt and aged cheese retains CLA effectively and may even produce additional CLA through bacterial activity during fermentation.
When Food Is Not Enough
For someone eating a varied omnivore diet rich in dairy and grass-fed meat, food is an adequate source of dietary CLA. However, those following vegan or low-fat diets, or anyone pursuing the specific body-composition goals studied in clinical trials, may find food sources insufficient to match research-level doses.
In those cases, a dedicated CLA supplement is a practical option. OstroVit CLA 1000 150caps and OstroVit CLA + Green Tea + L-carnitine 90 caps are among the options available at maxfit.ee. DY CLA Softgel Capsules is another popular choice from a well-known sports nutrition brand.
Browse the full range at MaxFit CLA category.
FAQ
What are the best food sources of CLA?
Grass-fed beef, lamb, butter, ghee, and hard cheeses are the richest natural CLA food sources. The CLA content is found in the fat portion, so leaner cuts provide less.
Is CLA from food the same as CLA in supplements?
Naturally occurring CLA is dominated by the c9,t11 isomer, while most supplements contain a roughly equal mix of c9,t11 and t10,c12 isomers. The two forms may have different physiological effects, so the source matters if you are targeting a specific outcome.
Can I get enough CLA from a plant-based diet?
No. CLA is produced by rumen bacteria in grazing animals and concentrates in their meat and milk. Plant foods and plant oils do not provide meaningful amounts of CLA.
References
Bauman, D. E., Baumgard, L. H., Corl, B. A., & Griinari, J. M. (2006). Biosynthesis of conjugated linoleic acid in ruminants. Proceedings of the Nutrition Society, 58(2), 579β587.
Shantha, N. C., Ram, L. N., O'Leary, J., Hicks, C. L., & Decker, E. A. (2004). Conjugated linoleic acid concentrations in dairy products as affected by processing and storage. Journal of Food Science, 60(4), 695β697. https://doi.org/10.1111/j.1365-2621.1995.tb06208.x
