You have probably noticed turmeric everywhere lately. It sits in lattes, on pharmacy shelves, and in glossy wellness ads promising calmer joints. Most of us end up wondering whether the spice actually does what the label suggests.
A 2025 network meta-analysis in BMC Complementary Medicine and Therapies pooled 17 trials on knee osteoarthritis with 913 patients in its main analysis. Every turmeric preparation tested beat a placebo at easing pain and improving how the knee moved.
The authors still graded the certainty of the evidence as low to very low. Bigger and longer trials are needed before anyone can call turmeric a reliable treatment.
How the researchers graded turmeric against placebo
The trials used WOMAC, a standard knee score for pain, stiffness and function. All turmeric products cut pain versus placebo. Function improved as well. Stiffness did not budge.
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A separate 2025 meta-analysis in Medicine (Baltimore) pooled seven trials in rheumatoid arthritis, a disease where the immune system attacks the joints. The 313 patients on curcumin had less joint pain and lower inflammation markers in their blood.
The authors described the improvements as statistically and clinically relevant. They also noted substantial differences between the trials and short follow-up windows of only 8 to 12 weeks.
Why the dose on the label matters so much
Curcumin is the active plant compound inside turmeric. In the body it blocks COX-2 and the immune signals the body sends out when tissue becomes inflamed. The Journal of Medicinal Food laid out that mechanism in detail.
Those effects turn up at trial doses of several hundred milligrams a day of pure curcumin. A teaspoon of kitchen turmeric contains only a fraction of that. Trial doses come from concentrated extracts, not from the spice rack.
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Curcumin also absorbs poorly on its own. A 1998 pharmacokinetic study in Planta Medica gave volunteers 2 grams of curcumin with 20 mg of piperine, the active compound in black pepper, and saw blood levels rise about 2,000 percent.
What this means if you are considering a supplement
Many turmeric supplements already contain piperine or a patented bioavailability-enhanced form. Check the label before buying. Food-level turmeric in curry or a golden latte will not reach the doses used in the trials.
Turmeric and curcumin can also thin the blood and may interact with warfarin, blood sugar drugs or regular painkillers. Anyone on prescription medication or living with an ongoing joint condition should ask their doctor before starting a high-dose extract.
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This article is made and published by Mie Hermansen, who may have used AI in the preparation.