This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer
Evidence-Based Benefits
Fat loss — Whigham et al. (2007, meta-analysis, 18 RCTs, n=795) found CLA at 3.2 g/day reduced fat mass by 0.05 kg/week vs placebo
Body composition — Blankson et al. (2000, n=60) showed CLA 3.4-6.8 g/day significantly reduced body fat mass without affecting lean mass over 12 weeks
Long-term effects — Gaullier et al. (2005, n=180) found CLA 3.4 g/day reduced body fat by 8.7% vs placebo over 12 months
Mechanism — t10,c12-CLA inhibits lipoprotein lipase and stearoyl-CoA desaturase, reducing fat storage in adipocytes
What the Research Says
Conjugated Linoleic Acid (CLA) is a well-researched supplement for weight management, supported by numerous randomized controlled trials (RCTs) and comprehensive meta-analyses. A 2007 meta-analysis by Whigham et al. demonstrated that CLA supplementation leads to modest fat loss, with an average effect of approximately 0.05 kg/week of fat loss. This effect is consistent over long periods, as shown in a study by Gaullier et al. (2004). Importantly, CLA may help preserve lean mass while reducing fat mass, which explains why it does not typically result in significant reductions in scale weight.
Recent studies have expanded on the effects of CLA beyond weight management. A 2023 systematic review by Liang et al. highlighted that exercise can enhance the body composition benefits of CLA supplementation. Additionally, a 2023 meta-analysis by Rastgoo et al., involving 42 studies, found that CLA supplementation can influence inflammatory markers and adipokines, suggesting potential broader health benefits.
However, safety considerations are important. A 2022 systematic review by Asbaghi et al., analyzing 56 RCTs, reported that while CLA supplementation significantly increases HDL-C levels, it also raises TG, TC, LDL-C, apolipoprotein A, and B concentrations, which may pose risks for individuals with lipid abnormalities. Furthermore, studies by Suksatan et al. (2022) and Haghighat et al. (2022) indicate that CLA may affect oxidative stress markers and liver function enzymes, though the clinical significance of these findings remains unclear.
Overall, while CLA shows promise for modest fat loss and potential metabolic benefits, its use should be approached with caution, particularly in at-risk populations, and under medical supervision.
Meta-analysisWhigham LD, Watras AC, Schoeller DA (2007). Efficacy of conjugated linoleic acid for reducing fat mass: a meta-analysis in humans. American Journal of Clinical Nutrition. DOIPubMed
RCTGaullier JM, Halse J, Hoye K, et al. (2004). Conjugated linoleic acid supplementation for 1 y reduces body fat mass in healthy overweight humans. American Journal of Clinical Nutrition. DOIPubMed
Purba RAP, Paengkoum P, Paengkoum S (2020). The links between supplementary tannin levels and conjugated linoleic acid (CLA) formation in ruminants: A systematic review and meta-analysis.. PloS one. DOIPubMed
Derakhshande-Rishehri SM, Mansourian M, Kelishadi R, Heidari-Beni M (2015). Association of foods enriched in conjugated linoleic acid (CLA) and CLA supplements with lipid profile in human studies: a systematic review and meta-analysis.. Public health nutrition. DOIPubMed
Meta-analysisOnakpoya IJ, Posadzki PP, Watson LK, Davies LA, et al. (2012). 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.. European journal of nutrition. DOIPubMed
Jamka M, Popek J, Bukowska-Posadzy A, Mądry E, et al. (2024). Psychological determinants of the effectiveness of conjugated linoleic acid supplementation in overweight and obese women-a randomized controlled trial.. Frontiers in nutrition. DOIPubMed
Meta-analysisLiang CW, Cheng HY, Lee YH, Liou TH, et al. (2023). Effects of conjugated linoleic acid and exercise on body composition and obesity: a systematic review and meta-analysis.. Nutrition reviews. DOIPubMed
Show 5 more references
Meta-analysisRastgoo S, Shimi G, Shiraseb F, Karbasi A, et al. (2023). The effects of conjugated linoleic acid supplementation on inflammatory cytokines and adipokines in adults: A GRADE-assessed systematic review and dose-response meta-analysis.. Frontiers in immunology. DOIPubMed
He Y, Xu K, Li Y, Chang H, et al. (2022). Metabolomic Changes Upon Conjugated Linoleic Acid Supplementation and Predictions of Body Composition Responsiveness.. The Journal of clinical endocrinology and metabolism. DOIPubMed
Asbaghi O, Ashtary-Larky D, Naseri K, Saadati S, et al. (2022). The effects of conjugated linoleic acid supplementation on lipid profile in adults: A systematic review and dose-response meta-analysis.. Frontiers in nutrition. DOIPubMed
Suksatan W, Putera HD, Abdulkadhim AH, Hammid AT, et al. (2022). The effect of conjugated linoleic acid supplementation on oxidative stress markers: A systematic review and meta-analysis of randomized controlled trials.. Clinical nutrition ESPEN. DOIPubMed
Haghighat N, Shimi G, Shiraseb F, Karbasi A, et al. (2022). The effects of conjugated linoleic acid supplementation on liver function enzymes and malondialdehyde in adults: A GRADE-assessed systematic review and dose-response meta-analysis.. Pharmacological research. DOIPubMed
