Heads up: this guide contains an affiliate link. If you buy through it we earn a small commission at no extra cost to you.
Tannin is the dry, grippy feeling a red wine leaves on your gums and along the sides of your tongue. It is not a flavour. It is a texture, and it comes from grape skins, grape seeds and oak barrels. That is the whole answer in four lines.
The word gets thrown around at tastings as though everyone was born knowing it. So here is what tannin really is, why it makes your mouth feel scrubbed, and how to get a young red to behave itself at dinner.
Table of Contents
The Short Answer
- Tannins are natural plant compounds that stick to the proteins in your saliva.
- When they do that, your mouth loses a little of its own slipperiness. That drying grip is called astringency.
- Astringency is a feeling rather than a taste, which is why tannin is so hard to describe.
- Cabernet Sauvignon is full of it. Pinot Noir has very little. Most reds sit somewhere in the middle.
Where Tannin Actually Comes From
Two different families of tannin end up in your glass. Condensed tannins come from the grape itself: the skins, the seeds and sometimes the stems. Hydrolysable tannins come from the oak barrel.
The gap between the two is much bigger than most people expect. Grape tannin shows up in red wine at roughly 2 to 4 grams per litre. Oak tannin tops out at about 250 milligrams per litre, according to UC Davis. So the barrel is a seasoning. The grape is the meal.
Skin tannins slide into the juice fairly easily. Seed tannins are more stubborn and need longer contact, which is why a long, warm ferment can pull out a harder edge, as the Australian Wine Research Institute explains.
Winemakers are also allowed to add grape and seed tannin extracts to wine, at rates from 50 to 1,000 milligrams per litre. That is not a scandal. It is closer to salting a soup.
Astringency Is a Feeling, Not a Flavour
Your saliva is slippery because it is full of proteins. Tannins grab those proteins, clump together with them and drag them out of solution, so the lubrication drops away and your mouth feels rough. UC Davis describes it as a loss of lubrication rather than a taste at all.
That also explains why the third sip grips harder than the first. You have used up some of the saliva that was protecting you. Water does not help much. Food does, and we will get to that.
Bitter and Astringent Are Not the Same Thing
This is the bit almost nobody writes down, and it changes how you taste wine. Tannin molecules come in different sizes. Seed tannins are short chains of roughly 2 to 16 units. Skin tannins are long chains that can run from 3 up to 83 units.
Size decides what you feel. The smaller seed tannins read as bitter. The larger skin tannins feel astringent. So a wine can be grippy without being bitter, and bitter without much grip.
Try this at the table. If the sensation sits at the back of your throat like over-stewed tea, that is bitterness. If it dries the front of your gums and the inside of your lips, that is astringency. Two different problems, two different fixes.
Which Wines Are the Most Tannic
This is a rough guide rather than a rule, because ripeness, ferment length and oak all move the dial. Still, the grape gets you most of the way there.
| Grape | Tannin | What it feels like |
|---|---|---|
| Cabernet Sauvignon | High | Firm and drying, right across the gums |
| Sangiovese | Medium to high | Sour cherry grip along the sides of the tongue |
| Shiraz | Medium to high | Rounder and warmer, more velvet than scrape |
| Tempranillo | Medium | Dusty and savoury, quite gentle |
| Grenache | Low to medium | Soft and generous, very easy going |
| Pinot Noir | Low | Silky, and gone almost before you notice it |
If you want to feel the difference properly, buy a Cabernet Sauvignon and a Pinot Noir on the same night and taste them side by side. Ten dollars of homework beats ten articles.
Five Ways to Make a Tannic Red Feel Softer
- Eat protein and fat with it. Steak, roast lamb and hard cheese all carry protein that grabs the tannin before your saliva has to. This is why a big red tastes rude on its own and lovely with dinner. Our guide to cheese and wine leans on exactly this.
- Do not serve it warm. Somewhere around 16 to 18 degrees is kind to a young red. At 24 degrees you taste the alcohol first and the grip second, and neither is fun.
- Decant it. Thirty to sixty minutes in a decanter softens the edges of most young reds, and a big glass does a smaller version of the same job.
- Give it years. As red wine ages, the purple slides towards brick red and the astringency falls away with it. That is the whole point of cellaring a Cabernet.
- Pick a gentler grape on a weeknight. Grenache and Pinot Noir ask far less of you than a young Shiraz does.
Drink One Tonight
If you want to taste firm, well-behaved tannin without buying something scary, a McLaren Vale Cabernet blend is the honest lesson. It has real grip, but there is enough ripe fruit underneath that it never feels like punishment.
Fox Creek Jim’s Script McLaren Vale Cabernet Blend 2022
A textbook grippy red at a sensible price. Pour a small glass on its own, then eat a piece of cheddar and taste it again. The tannin will feel like a different wine, and that is the whole lesson in one bite.
- Firm, classic Cabernet grip
- Ripe McLaren Vale fruit to balance it
- Even better with steak or hard cheese
- Wants 30 minutes in a decanter
- Too serious for a hot afternoon
Frequently Asked Questions
Do white wines have tannin?
A little, but not much. White grapes are usually pressed off their skins straight away, so very little tannin is picked up. Orange wines, which are whites left on their skins, are the exception and can be properly grippy.
Do tannins cause red wine headaches?
It is the usual suspect, but the evidence is thin. Alcohol itself dehydrates you, and that explains a lot of next-morning misery on its own. If you notice a pattern with one style of wine, take it seriously, but do not assume tannin is the cause.
Does decanting remove tannin?
No. The tannin is still there. Decanting exposes the wine to air, which changes how the whole glass comes across, so the grip feels less sharp against the fruit. It softens the impression rather than the chemistry.
Are tannins the same as sulphites?
Not at all. Sulphites are a preservative, added in small amounts to keep wine fresh. Tannins are structural compounds that come from the fruit and the barrel. Different jobs entirely.
Why does strong tea feel like red wine?
Because tea is full of tannin too. If you leave a teabag in too long and your mouth goes dry, you have just run a free tannin experiment in your own kitchen.
How can I tell if a wine will be tannic before I open it?
Look at the grape first, using the table above. Then look at the age. A young Cabernet or Sangiovese from the last two or three years will grip. The same wine at ten years old will not.
Fortified wines play by different rules, and our explainer on what port wine is shows why they end up so sweet and so strong.
This post contains affiliate links. If you buy through them we earn a small commission at no extra cost to you. It keeps the wine flowing and the reviews honest.
