What is turmeric? A plain guide

Turmeric is the dried, ground rhizome of Curcuma longa, a ginger-family plant native to South Asia — the ingredient behind curry's yellow color and a spice, food dye and traditional remedy for centuries. Sold today as culinary powder, a standardized curcuminoid extract, or an extract combined with piperine or a phospholipid carrier to raise absorption, these are three different products with three different absorption profiles, not three strengths of the same thing.

The plant and the part that's used

Curcuma longa is a flowering plant in the ginger family (Zingiberaceae), grown widely in India, Southeast Asia and parts of Africa and Latin America. The part used is the rhizome — an underground stem, similar to how ginger root is used — which is boiled, dried and ground into the fine orange-yellow powder found in spice aisles worldwide. Fresh turmeric rhizome, sold in some grocery stores, is the same plant part before drying and grinding.

Curcuminoids: the compounds most research is about

Turmeric's color and most of its research interest come from curcuminoids — curcumin and two closely related compounds (demethoxycurcumin and bisdemethoxycurcumin). These make up only a small share of the dried root by weight; culinary turmeric powder is mostly starch and fiber. Concentrated supplements are standardized to a much higher percentage of curcuminoids, commonly around 95%, which is a different product from the spice jar, not a stronger version of it.

Why absorption changes what's actually in a product

Curcumin on its own is poorly absorbed. A 2007 review of the bioavailability research found curcumin safe in human trials even at doses as high as 12 g a day, but reported that poor absorption, rapid metabolism and rapid elimination keep blood levels low regardless of dose. A 1998 study in healthy volunteers illustrates the problem directly: a 2 g dose of curcumin alone produced barely measurable levels in the blood, but adding just 20 mg of piperine — the compound that makes black pepper pungent — raised curcumin's measured bioavailability by 2000%. That's why many supplements pair curcumin with black pepper extract (often labeled piperine or BioPerine), while others use a phospholipid complex, liposomal delivery or nanoparticle formulation to the same end. Each is a different way of trying to solve the same absorption problem, and they aren't interchangeable with each other or with plain turmeric powder at the same milligram count.

Powder, extract, or enhanced-absorption formula

• Turmeric root powder — the whole dried, ground rhizome, used as a spice and sold as a supplement in capsules. Low curcuminoid content by weight, and not concentrated.
• Standardized curcumin extract — concentrated to a stated curcuminoid percentage, commonly around 95%. This is the form most clinical research has actually used, at doses far above what a spice-jar serving would provide. See how much turmeric should you take a day? for what those trial doses were.
• Enhanced-absorption extract — a curcumin extract combined with piperine, a phospholipid complex, or another delivery technology meant to raise how much reaches the bloodstream. A label listing one of these is describing a different product from a plain extract at the same milligram amount, not simply a fancier version of it.

Knowing which of these three a product actually is matters more than the total milligrams on the front of the label — see how to choose a good turmeric.

Food, color and regulatory status

The FDA lists turmeric among the spices and natural seasonings generally recognized as safe for food use (21 CFR 182.10). Turmeric and turmeric oleoresin are also separately listed as color additives exempt from certification (21 CFR 73.600, 73.615) — the reason it's used to color mustard, cheese and processed foods. Both of these are food-safety and labeling categories, not a statement about a supplement dose or a health effect; turmeric benefits: what the research does and doesn't show covers what's actually been tested.

Questions people ask

What does turmeric taste like?

Earthy, slightly bitter and peppery, with a musky, mustard-like warmth — closer to ginger than to a sweet spice. It's used in small amounts in most recipes because the flavor is strong relative to its color.

Can dogs eat turmeric?

This page is about turmeric as a human dietary supplement; it doesn't cover dosing for pets. A veterinarian is the right source for whether and how much turmeric is appropriate for a specific dog.

Where does turmeric come from, and how do you grow it?

Curcuma longa is native to South and Southeast Asia and is grown as a warm-climate crop; India is by far the largest producer. Growing questions — soil, watering, harvest timing — are gardening topics this page doesn't cover.

What is turmeric used for?

As a spice, a food dye, and a traditional remedy across South and Southeast Asian medicine for centuries. That history isn't the same as clinical evidence at a specific dose — turmeric benefits: what the research does and doesn't show covers what's actually been tested and at what dose.

Is turmeric the same as curcumin?

No. Curcumin is one of several compounds (curcuminoids) found in turmeric root, and the one most laboratory and clinical research has focused on. "Turmeric" on a label can mean root powder with a low, unstated curcuminoid content, or an extract standardized to a specific curcuminoid percentage — two very different amounts of the compound the research is actually about.

Related reading: turmeric benefits: what the research does and doesn't show, how much turmeric should you take a day?, and how to choose a good turmeric.