Supplement
Conjugated Linoleic Acid (CLA)
A fatty acid that occurs naturally in dairy products and meat. Supplements deliver much higher doses than food does. Despite heavy marketing for fat loss, the evidence shows only very modest effects on body fat. Some studies also point to possible unfavourable effects on metabolism.
Estimated cost
~$20–$40/month
How to take
Capsules 2–3 times daily — straightforward
A systematic review found a very small drop in body fat of about 0.05 kg a week vs.
For context — weight loss from prescription medications:
How it works
CLA is thought to cut fat storage by changing how fat cells behave and by raising fat burning. Exactly how it does that is not settled. In animals, CLA has clear anti-obesity effects. In human trials the effects are consistently much smaller.
What the evidence shows
placebo. The drop was small but statistically significant, meaning it is unlikely to be down to chance. Over 6 months that comes to roughly 1.3 kg less fat mass — very modest. Results are inconsistent across trials, and many studies have industry funding. The effect is on body fat in particular, not necessarily on total body weight.
The trade-off
What this tends to offer:
- Small but measurable fat loss in some trials
- Available without prescription
- Relatively affordable (~$20–$40/month)
What this involves:
- Very small effect size (0.05 kg/week)
- Potential negative metabolic effects (insulin sensitivity, inflammation)
- Synthetic form differs from natural dietary CLA
- Gut side effects reported in some users
Safety
Gut (GI) upset, nausea, and diarrhoea are common at higher doses. More concerning, some studies have found possible rises in insulin resistance and in liver fat markers in people taking CLA. Those possible metabolic harms are a reason for caution. They would be especially counterproductive in people with obesity. Not recommended during pregnancy.
Community insights
These are personal experiences shared in public online communities — not medical advice.
“The insulin resistance signal in some studies is a red flag. If you are taking CLA to improve your metabolic health, you may be working against yourself.”
“You would need to eat huge amounts of grass-fed beef and dairy to get supplement-level CLA from food. Whether that is worth doing is another question.”
Common questions
Written and maintained by one person · Built with agentic AI tools · Every number checked against the cited trial · Not medical advice
In the Systematic review and meta-analysis (Onakpoya 2012), Statistically significant reduction in body fat of ~0.05 kg/week vs. placebo. Equates to ~1.3 kg over 6 months. Results inconsistent; industry funding prevalent. Some evidence of insulin resistance and liver fat increases.
After reading this page, most people compare this with other supplements, look at prescription options, or check what they can do today without a prescription.
Next step most people take
Built with agentic AI tools and not a substitute for medical advice
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