If you’ve ever taken a sip of red wine and felt your mouth dry out — that chalky, gripping sensation along your gums and cheeks — you’ve experienced tannins. But what exactly are they, where do they come from, and why do winemakers care so much about them?
Tannins in 30 Seconds
Tannins are naturally occurring polyphenolic compounds found in grape skins, seeds, and stems, as well as in oak barrels. When you drink a tannic wine, these compounds bind to the proteins in your saliva, which is what creates that dry, astringent sensation. It’s the same feeling you get from drinking strong black tea, biting into an unripe banana, or eating dark chocolate.
Tannins aren’t a flavor — they’re a texture. You feel them more than you taste them, which is why wine professionals talk about tannin as a structural component of wine, not a flavor component.
Where Do Wine Tannins Come From?
There are two main sources of tannin in your glass:
1. The Grapes
Grape tannins come from the skins, seeds, and stems. Since red wine is fermented with the skins (and sometimes stems), red wines have significantly more tannin than whites. The thicker the grape skin, the more tannin potential. This is why Cabernet Sauvignon (very thick skin) is much more tannic than Pinot Noir (thin skin).
The winemaker controls extraction during fermentation through temperature, maceration time, and “whole-cluster” decisions. A longer, warmer fermentation extracts more tannin.
Whole cluster is a major decision point in winemaking, especially in varietals like Pinot Noir, where the light nature of the grape allows room for the earthy, tannic, herbaceous flavor additions of the clusters. While working at Windy Oaks in Santa Cruz Mountains, my favorite fermentation was their whole cluster; I find that it ages extremely well — read on to see why.
2. The Wood
Oak tannins come from aging wine in barrels. New oak imparts more tannin than used barrels. French oak tends to contribute finer, more elegant tannins, while American oak can add slightly coarser, more assertive tannins. Even the “toast” level of the barrel changes the tannin profile.
Why Tannins Matter
Tannins serve three critical functions:
- Structure: Think of tannins as the “skeleton” of the wine. They provide the backbone that holds the fruit, acid, and alcohol together. Without tannin, a big red wine would just feel like flat grape juice.
- Aging Potential: Tannins act as a natural preservative. Over time, tannin molecules link together (polymerize) and fall to the bottom of the bottle as sediment. This is why a harsh, young Cabernet becomes silky and complex after a decade in the cellar.
- Food Pairing: Tannins love protein and fat. This is why a tannic red wine “scurbs” the fat from your palate during a steak dinner, leaving your mouth refreshed for the next bite.
Tannin Levels by Grape Variety
| Level | Grape Varieties |
| High Tannin | Cabernet Sauvignon, Nebbiolo, Tannat, Petite Sirah |
| Medium Tannin | Merlot, Syrah, Sangiovese, Malbec |
| Low Tannin | Pinot Noir, Gamay, Barbera, Dolcetto |
How to Talk About Tannins (Without Being Pretentious)
Instead of saying “it’s dry,” which is technically inaccurate, since dry refers to the sweetness of the wine. When describing tannins, stick to describing the texture of the tannin:
- Fine/Silky: Smooth and elegant (think high-end Pinot Noir).
- Velvety: Soft but present (well-aged Merlot).
- Grippy: Strong astringency that dries the mouth but feels balanced (young Cabernet).
- Chalky/Dusty: A powdery sensation on the tongue (common in Malbec).
- Green/Harsh: Bitter and aggressive—usually a sign of underripe grapes (a winemaking flaw).
Practical Tips for the Tannin-Averse
- Serve with Food: If a wine feels too “grippy,” eat something fatty. Cheese, ribeye, or even buttery pasta will soften the blow.
- Decant: Exposing the wine to air for 30–60 minutes helps those tannins “relax” and makes the wine feel rounder.
- Check the Age: If you hate the “sandpaper” feel of young reds, look for bottles with 5+ years of age. Time is the only thing that truly tames a tannin.
FAQ
Not at all. In fact, they’re loaded with antioxidants. Unless you have a very rare, specific sensitivity, tannins aren’t the enemy. If you’re getting a “wine headache,” it’s more likely the alcohol, dehydration, or biogenic amines—don’t blame the grape skins for your hangover.
It’s a chemical reaction. Tannins are literally “protein-seekers.” They bind to the lubricating proteins in your saliva and cause them to clump together. When your saliva loses its slipperiness, your tongue rubs against your cheeks—that friction is what you’re feeling as “dryness.”
Very little. Because we press the juice away from the skins immediately, white wine misses out on the “tannin bath” that reds get. However, if a white wine spent a long time in new oak barrels, or if it’s an “Orange Wine” (skin-contact white), you’ll definitely feel a bit of that grip.
Tannat is the heavyweight champion (it’s literally in the name). Close runners-up are Nebbiolo and Petite Sirah. If you drink these young without food, be prepared for your mouth to feel like it’s been through a dehydrator.
You can’t remove them, but you can “mask” them. Decant the bottle to let oxygen smooth out the edges, and serve it with fat. The tannins will bind to the fat in your food instead of the protein in your spit. It’s the ultimate winemaking magic trick