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Curious about conjugated linoleic acid and weight loss? Here’s what to know about CLA, how it works, recommended dosage, possible side effects and what the research says
Summary
1What is CLA?
It's a type of fat found naturally in small levels in foods like the meat and dairy of certain animals.
2Can CLA help with weight loss?
It may help with minimal weight loss, according to emerging research, but more studies are needed.
3Tips for sustainable weight management
Aiming for balanced meals that include plenty of vegetables and fruit is a great place to start.
Conjugated linoleic acid (CLA) is a fatty acid that’s been associated with potential weight loss benefits for many years. But is it actually useful? Let’s look at what CLA is, what the research says about its effect on weight and body fat and the everyday habits proven to support healthy, long-term weight management.
What is CLA?
CLA is a type of fat found naturally in small levels in foods like meat and dairy of certain animals, such as cows, sheep and goats. It’s produced by bacteria in these animals' stomachs during digestion.1 There’s an important difference between the small amounts of CLA found naturally in everyday foods and the concentrated CLA sold as a supplement.
Supplement capsules usually contain CLA made in a lab from vegetable oils such as sunflower or safflower oil, at doses higher than anyone could realistically get from food alone. Most research into CLA and weight has looked at these concentrated supplement doses, not the small amounts found in a normal diet.2‐5
Can CLA help with weight loss?
CLA may help with minimal weight loss according to emerging research. Several reviews have pooled the results of multiple clinical trials to get a clearer picture, which is the strongest type of evidence we have on CLA and weight.
One systematic review and meta-analysis looked at trials lasting six months or longer and found that people taking CLA lost, on average, about 0.7 kg more than people taking a placebo.2 A separate review focused on overweight and obese adults found a similarly small reduction in body weight, but the authors stressed that this effect is unlikely to be noticeable in real life.3 The most recent and largest analysis, published in 2024, pooled data from many trials and found small reductions in body weight, waist size and body fat, but when only the highest-quality studies were looked at on their own, the weight loss effect disappeared.4 A review looking at CLA combined with exercise found the results were inconsistent, with some studies showing a small benefit but others showing none at all.5
So, across the best available research, CLA supplements are linked with only a small amount of extra weight or fat loss, typically less than 1kg over several months, which is smaller than what can be achieved through diet and exercise. While there may be a small benefit in some people, the evidence overall is still emerging, and more research is needed.
As with any nutritional supplement, if you’re thinking about taking it and have any pre-existing health conditions, you should speak to a pharmacist, GP or dietitian first.
Other ways to support healthy, sustainable weight management
Any weight loss supplement, including CLA, should always be viewed as a potential complement to a balanced diet and healthy lifestyle. Finding the habits that feel realistic and manageable for you can help support your weight management goals over time.
Building healthy eating habits
Rather than following a restrictive diet, aim for balanced meals that include plenty of vegetables and fruit, high-fibre foods such as wholegrain bread, pasta or potatoes with the skin on and sources of protein such as beans, fish, eggs or lean protein at each meal.8
Protein and fibre both help you feel fuller for longer, which can make it easier to manage portion sizes without feeling deprived.9 Try to build routines you can stick to, such as planning meals ahead or keeping healthy snacks to hand, rather than relying on willpower alone. Small, steady changes tend to last longer than short, strict diets that are hard to keep up.9
Staying active
The NHS recommends adults aim for at least 150 minutes of moderate activity a week, such as brisk walking or cycling, or 75 minutes of more vigorous activity like running.10 Just as important, though often overlooked, is doing muscle-strengthening activity, such as carrying heavy shopping, gardening or resistance exercises, on at least two days a week.10
Strength training helps preserve muscle mass, which matters because muscle uses more energy than fat, even at rest, helping to burn more calories overall.10 Any activity is better than none and it doesn’t need to be done all at once – short bursts through the day add up.10
Looking after your overall health
Weight management isn’t just about food and exercise. Getting enough good-quality sleep and managing stress both play a role, as poor sleep and high stress are linked to changes in appetite and food choices.11 Building a consistent routine around meals, sleep and activity – rather than chasing quick fixes – tends to give the best long-term results.
Why there isn't a magic solution to weight loss
It's understandable to want a quick solution when on a weight loss journey, but no pill or capsule, including CLA, can replace a balanced diet, regular movement, good sleep and consistency over time. Based on the current evidence, CLA might offer a small addition on top of these habits, but it shouldn’t be the main focus and isn’t a substitute for advice from a medically trained health professional if you’re trying to manage your weight for health reasons.
CLA FAQs
CLA is mainly marketed as a weight-loss and body-toning supplement, so people may use it as part of their weight management journey. However, the evidence for these effects in humans isn’t currently that strong and any benefit appears to be small. If you’re considering a CLA supplement, it’s important to check with your GP whether it’s suitable for you.3,4
Some trials have measured waist size alongside weight and a small reduction has been seen in some of these trials, but this effect is inconsistent between studies and disappears when only the highest-quality trials are considered.4 There’s no good evidence that CLA can target fat loss from one specific area of the body.
Most of the trials showing any effect lasted six months or longer.2,3 Even then, the difference compared with a placebo was small, so CLA isn’t a quick or dramatic fix.
The final say
Collectively, the best available evidence shows that CLA supplements may lead to only small reductions in weight or body fat. However, due to the quality of the studies, more high-quality research is needed. It’s best to speak to a healthcare professional before trying any new supplement to make sure it’s right for you. The most reliable, well-evidenced way to manage weight healthily and sustainably remains a balanced diet, regular physical activity (including resistance training), good sleep and consistent, realistic habits built up over time.
Looking for more weight management advice? Discover how calorie restriction can affect your energy or the difference between body composition and BMI.
Disclaimer – This article provides informational advice and is not a substitute for medical care. Working with experts for accuracy, we take great care to ensure the information is up-to-date and relevant. However, you should always consult your GP or healthcare professional before using supplements or alternative products, particularly if you have medical conditions or are under supervision.
1. Ritzenthaler, K.L., McGuire, M.K., Falen, R., et al. (2001). Estimation of conjugated linoleic acid intake by written dietary assessment methodologies underestimates actual intake evaluated by food duplicate methodology. Journal of Nutrition, 131(5), 1548–1554.
2. Onakpoya IJ, Posadzki PP, Watson LK, Davies LA, Ernst E. The efficacy of long-term conjugated linoleic acid (CLA) supplementation on body composition in overweight and obese individuals: a systematic review and meta-analysis of randomized clinical trials. Eur J Nutr. 2012;51(2):127-34.
3. Namazi N, Irandoost P, Larijani B, Azadbakht L. The effects of supplementation with conjugated linoleic acid on anthropometric indices and body composition in overweight and obese subjects: a systematic review and meta-analysis. Crit Rev Food Sci Nutr. 2019;59(17):2720-33.
4. Asbaghi O, Shimi G, Hosseini Oskouie F, Naseri K, Bagheri R, Ashtary-Larky D, et al. The effects of conjugated linoleic acid supplementation on anthropometrics and body composition indices in adults: a systematic review and dose-response meta-analysis. Br J Nutr. 2024;131(3):406-28.
5. Liang CW, Cheng HY, Lee YH, Liou TH, Liao CD, Huang SW. Effects of conjugated linoleic acid and exercise on body composition and obesity: a systematic review and meta-analysis. Nutr Rev. 2023;81(4):397-415.
6. European Food Safety Authority Panel on Dietetic Products, Nutrition and Allergies. Scientific opinion on the safety of ‘conjugated linoleic acid (CLA)-rich oil’ (Clarinol®) as a novel food ingredient. EFSA J. 2010;8(5):1601.
7. European Food Safety Authority Panel on Dietetic Products, Nutrition and Allergies. Scientific opinion on the substantiation of health claims related to conjugated linoleic acid (CLA) isomers and maintenance or achievement of normal body weight, increase in lean body mass and other claims, pursuant to Article 13(1) of Regulation (EC) No 1924/2006. EFSA J. 2010;8(10):1794.
8. NHS. Eating a balanced diet [Internet]. London: NHS; 2024 [cited 2026 Aug 6]. Available from: https://www.nhs.uk/live-well/eat-well/how-to-eat-a-balanced-diet/eating-a-balanced-diet/
9. NHS Inform. Tips for losing weight [Internet]. Scotland: NHS; 2026 [cited 2026 Aug 12]. Available from: https://www.nhsinform.scot/healthy-living/weight-loss/tips-for-losing-weight-safely/
10. Department of Health and Social Care. UK Chief Medical Officers' physical activity guidelines [Internet]. London: GOV.UK; 2019 [cited 2026 Aug 6]. Available from: https://www.gov.uk/government/publications/physical-activity-guidelines-uk-chief-medical-officers-report
11. Hall WL. The emerging importance of tackling sleep-diet interactions in lifestyle interventions for weight management. Br J Nutr. 2022;128(3):561-8.
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