Important: This page is for informational purposes only, based on published peer-reviewed research and official UK dietary guidelines (NHS, EFSA, SACN). It does not constitute medical advice. Always consult your GP or pharmacist before starting, stopping, or combining supplements.
CLA and Omega-3 — Can You Take Them Together?
Overview
CLA (conjugated linoleic acid) and omega-3 fatty acids are both lipid-based compounds, yet their biological actions differ considerably. CLA — found naturally in dairy products and ruminant meat — is most commonly studied in the context of body composition, while omega-3 EPA and DHA are the subject of SACN guidance recommending at least 450 mg combined per week. Emerging research suggests that when taken together, these two fatty acids may exert complementary effects on fat metabolism and metabolic markers. Evidence remains early-stage, and individual responses are likely to vary depending on baseline health, diet quality, and activity levels.
How They Interact
The potential synergy between CLA and omega-3 stems from their distinct molecular targets. The trans-10, cis-12 isomer of CLA has been shown in cell-based research to inhibit lipoprotein lipase (LPL) — an enzyme central to the uptake of circulating triglycerides into adipose tissue — and to reduce adipocyte lipid accumulation (PMID 11257467). Evidence also suggests this CLA isomer modulates PPARgamma, a nuclear receptor involved in adipocyte differentiation and lipid storage signalling. Omega-3 fatty acids (EPA and DHA) operate via a different route: a randomised controlled trial found that omega-3 supplementation significantly reduced macrophage infiltration and MCP-1 expression within adipose tissue in insulin-resistant individuals (PMID 23328126), attenuating the chronic low-grade inflammation associated with excess body fat. A direct combination trial (Sneddon et al., 2008; PMID 18356842) found that co-supplementation prevented abdominal fat accumulation, raised fat-free mass, and increased adiponectin in younger obese men — suggesting the two compounds may act on complementary aspects of adipose biology. Human evidence remains limited and further clinical trials are needed.
Timing & Dosage Guidance
Both CLA and omega-3 are fat-soluble and are best absorbed when taken with a meal containing dietary fat. Research does not indicate these supplements need to be separated from each other; existing combination studies have co-administered them without reported absorption conflicts. Splitting doses across two meals — for example CLA with breakfast and omega-3 with the main evening meal — may help tolerability for those prone to gastrointestinal discomfort with fatty acid supplements. If taking fat-soluble vitamins (A, D, E, or K2) alongside either supplement, spacing by 2–3 hours is a reasonable precaution to avoid potential competition for absorption. Individual responses may vary.
Most human trials on CLA have used 3–6 g per day, typically as a 50:50 blend of c9,t11 and t10,c12 isomers (e.g. Tonalin or Clarinol). The primary combination study (Sneddon et al., 2008; PMID 18356842) used 3 g/day CLA alongside 3 g/day omega-3. For omega-3, SACN recommends a minimum of 450 mg EPA+DHA per week from dietary or supplement sources; research studies often use 2–4 g/day. No established combined dosage protocol exists for these two supplements. Individuals considering higher CLA doses should note that evidence suggests a modest elevation in LDL cholesterol and lipoprotein(a) at higher doses (Gaullier et al., 2004; PMID 15159244); seeking professional guidance is advisable.
Recommended Action
Both can be taken with a meal containing fat. They are sometimes combined in body composition support formulas.
CLA Timing
When: Any
Note: Take with meals. Most studies use 3,000-6,000 mg/day split across meals.
Omega-3 Timing
When: Any
Note: Take with a meal containing fat for best absorption. Split high doses across meals to reduce fishy burps. Freeze capsules to reduce aftertaste.
Scientific Evidence
4 peer-reviewed studies cited. All links lead to PubMed abstracts.
Obesity (Silver Spring) (2008) · PMID: 18356842
A 12-week randomised crossover trial found that combined CLA plus omega-3 supplementation prevented abdominal fat accumulation, raised fat-free mass by 2.4%, and increased adiponectin by 12% in younger obese men, without adversely affecting insulin sensitivity.
American Journal of Clinical Nutrition (2004) · PMID: 15159244
In a one-year randomised controlled trial, CLA supplementation reduced body fat mass by 6.9–8.7% relative to placebo in healthy overweight adults, though modest increases in LDL cholesterol and lipoprotein(a) were observed.
Diabetes (2013) · PMID: 23328126
A 12-week randomised placebo-controlled trial found that 4 g/day omega-3 supplementation significantly reduced adipose tissue macrophage infiltration and MCP-1 expression in insulin-resistant individuals, highlighting a distinct anti-inflammatory mechanism in fat tissue.
Lipids in Health and Disease (2012) · PMID: 23107305
In skeletal muscle cell cultures, both CLA and omega-3 independently increased mitochondrial biogenesis and oxidative metabolism; omega-3 specifically upregulated PGC-1α expression, a key regulator of mitochondrial function and energy expenditure.
Frequently Asked Questions
Research to date does not indicate any pharmacological reason to separate CLA and omega-3 supplementation. The combination trial by Sneddon et al. (2008; PMID 18356842) co-administered both compounds without reported interaction concerns. Both are fatty acids that absorb best with dietary fat, so taking them together with a meal is a practical approach. As with any supplement regimen, individual responses may vary, and those with existing health conditions should seek professional guidance.
The most direct human evidence comes from a randomised crossover trial (Sneddon et al., 2008; PMID 18356842) in which 59 men received 3 g/day CLA plus 3 g/day omega-3 for 12 weeks. In younger obese participants, the combination prevented increases in abdominal fat, raised fat-free mass by approximately 2.4%, and increased adiponectin by 12%. Effects in lean or older participants were modest or absent. The evidence base is currently described as emerging.
Both compounds are generally well tolerated at typical supplemental doses. A consideration for CLA is that higher doses have been associated with modest increases in LDL cholesterol and lipoprotein(a) in some trials (Gaullier et al., 2004; PMID 15159244). Omega-3 at doses above 3 g/day may have mild antiplatelet effects. Individuals taking anticoagulant medication or managing lipid levels under NHS care should consult their GP before using either supplement at higher doses.
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