What is ginger? A plain guide

Ginger is the underground stem of the flowering plant Zingiber officinale — botanically a rhizome, not a true root — sold fresh, dried and ground, crystallized, or packed into capsules and extracts. It's used as a cooking spice and, separately, as a dietary supplement; what the research does and doesn't support for either use is covered on its own page.

What kind of plant it is

Zingiber officinale is a tropical perennial in the Zingiberaceae family, native to Southeast Asia and now cultivated widely, with India, China, Nigeria and Indonesia among the largest producing countries. The plant grows reed-like stalks a few feet tall with narrow leaves; what shows up in a grocery store is the knobby, branching underground stem, harvested after the above-ground growth dies back. That underground stem is a rhizome — a stem that grows horizontally underground and sends up shoots — not a root in the botanical sense, even though "ginger root" is what almost everyone calls it.

The forms it's sold in

What "ginger" can mean on a label or in a recipe

Form	What it is	Where you'll see it
Fresh rhizome	The whole or cut fresh stem, peeled or unpeeled	Produce section; used grated, sliced or juiced
Dried, ground powder	Dried rhizome ground fine	Spice aisle; baking, tea, some supplements
Crystallized or candied	Cooked in sugar syrup and coated in sugar	Snack aisle — contains added sugar, not equivalent to a supplement dose
Pickled	Thin-sliced and pickled in vinegar, often with sugar and coloring	Sushi condiment ("gari")
Extract or oil	Concentrated liquid or standardized extract, sometimes measured by gingerol percentage	Tinctures, some capsules and topical products
Capsules or tablets	Dried powder or extract, measured in milligrams	Dietary supplements — see how to choose a good ginger

What's actually in it

According to a National Institutes of Health reference database on medications and lactation, ginger's pungent, characteristic compounds are gingerols — 6-gingerol chief among them — and shogaols, which form as gingerols break down with heat or age (it's part of why dried ginger tastes sharper and hotter than fresh). The same reference notes ginger is "generally recognized as safe" by the FDA as a food flavoring. Beyond those pungent compounds, ginger's basic nutrition is unremarkable: USDA food composition data for raw ginger rhizome puts it at about 80 calories, 1.8 grams of protein, 17.8 grams of carbohydrate and 0.8 grams of fat per 100 grams, with a modest amount of potassium and manganese. Nobody eats 100 grams of ginger in a sitting, so in practical culinary or supplement amounts, none of that nutrition content is significant on its own — the gingerols and shogaols are why ginger is used at all.

How to store fresh ginger

Unpeeled and whole, fresh ginger keeps for roughly three weeks in the refrigerator, loosely wrapped so it can breathe rather than sealed airtight, which tends to trap moisture and speed mold growth. Once it's peeled or cut, it keeps for about a week refrigerated in a sealed container or bag; storing peeled pieces submerged in dry sherry, vinegar or vodka in a sealed jar in the fridge extends that to a month or more. For longer storage, whole or peeled ginger freezes well for several months and can be grated straight from frozen without thawing — a common shortcut, since frozen ginger is easier to grate finely than fresh. Dried, ground ginger keeps for a few years in a sealed container away from heat and light, though like any ground spice it gradually loses potency and aroma well before it "goes bad" in a food-safety sense.

How to prepare fresh ginger

The thin skin is usually scraped off with the edge of a spoon (which follows the rhizome's irregular shape better than a peeler) or left on entirely — the skin isn't harmful, just tougher and more fibrous. From there, a fine grater or microplane turns a peeled knob into the paste most recipes and teas call for; a standard box grater or a sharp knife works for coarser shreds or matchstick pieces meant to stay distinct in a dish rather than melt into it. Cutting across the rhizome's visible fibers, rather than along them, makes both grating and shredding easier and less stringy.

Is ginger a root or a stem?

A stem — specifically a rhizome, a modified stem that grows horizontally underground. True roots (like carrots) and rhizomes (like ginger and turmeric) are easy to mix up because both grow underground and get lumped together as "root vegetables" in everyday language, but botanically they're different plant structures. It doesn't change how ginger is used in cooking or as a supplement; it's just a naming quirk worth knowing if a label or recipe calls it a "root" and you're wondering whether that's technically accurate. It isn't, quite — but "ginger root" is so universal that this guide uses it too.

Growing ginger at home

A piece of fresh rhizome with visible "eyes" (small buds, the same growth points a potato sprouts from) can be planted in soil or a large container and will typically sprout given warm, humid conditions and several months to mature — the reason "how to plant ginger root" and "when to harvest ginger root" turn up alongside culinary and supplement searches for this ingredient. Growing it well enough to harvest a usable rhizome is a project with its own set of variables (climate, container size, patience), and it's a separate topic from choosing or using ginger as a spice or supplement, which is what the rest of this guide series covers.

What it's used for

As a spice, ginger flavors everything from baked goods to stir-fries to tea. As a supplement, the same National Institutes of Health reference database noted above states plainly that ginger "is commonly used for nausea and motion sickness" — a statement about how people use it, not a verdict on how well it works. What controlled trials have and haven't found for that and other commonly searched uses is the subject of ginger benefits: what the research does and doesn't show; how much people have taken in those trials is in how much ginger should you take a day; and what to know before combining it with a medication or health condition is in ginger side effects, who should not take ginger and ginger and medications: what to check.

Questions people ask

What does ginger taste like?

Sharp, peppery and slightly sweet, with a warming sensation from the gingerol and shogaol compounds described above. Dried ginger tastes hotter and more concentrated than fresh, since heat and drying convert some gingerols into more pungent shogaols.

What does ginger look like?

The plant itself grows narrow, reed-like leaves on stalks a few feet tall. What's sold as "ginger root" is the pale tan, knobby, branching rhizome dug up from underground — it has a thin papery skin over pale yellow flesh, sometimes tinged green or blue near the growing tips.

How do I store ginger root?

Unpeeled and whole, it keeps roughly three weeks in the refrigerator loosely wrapped; peeled or cut pieces last about a week refrigerated, or several months frozen. See the storage section above for specifics.

Is ground ginger the same as fresh ginger?

Chemically related but not interchangeable in a recipe or a supplement label — drying and grinding concentrates some compounds and changes the flavor balance, which is why a recipe calling for fresh ginger typically uses a much smaller amount if ground ginger is substituted.

Is ginger root healthy?

It's recognized as safe to eat as a food, and it contains compounds (gingerols, shogaols) that have been studied for various effects. Whether it does anything specific at typical supplement amounts is a separate question — see ginger benefits: what the research does and doesn't show for the honest answer.

Is ginger good for dogs?

This guide and the research it links to are about human use. Ginger's safety and effects in dogs are a separate veterinary question this page doesn't cover — ask a veterinarian before giving any human supplement or food to a pet.