What is namazake, and why does it need a refrigerator?

Almost all sake is pasteurised — heated gently, usually twice, to stop enzyme activity and stabilise the liquid for storage and transport. It is the reason a bottle can sit on a shelf for a year and still taste as the brewery intended.

Namazake (生酒) skips it entirely. That single omission produces the freshest, liveliest sake you can drink and the most fragile bottle in the category.

What pasteurisation is doing

Sake is pasteurised by heating to roughly 60–65°C — well below boiling — either by passing it through a heat exchanger or by warming the bottle. It is normally done twice: once after pressing, once before or after storage.

Two things are being stopped:

Enzymes. The koji enzymes that converted starch to sugar do not switch off when fermentation ends. Left active, they keep working on the finished sake, changing it slowly.

Microorganisms. Chiefly hiochi bacteria, a lactic acid bacterium adapted to survive in alcohol, which can turn a bottle cloudy and sour.

Heat solves both. It also costs something: a little of the fresh, green, faintly spritzy character that a young sake has straight from the tank.

What nama tastes like

Fresher. That is the honest one-word answer, and it is not a small difference.

Namazake typically shows:

• A brighter, greener aroma — melon rind, young banana, a hint of yeasty freshness
• More texture on the palate, sometimes a faint prickle of dissolved carbon dioxide
• Less roundness than a pasteurised equivalent, in the way that a fresh cheese is less round than an aged one

It is the difference between bread from the oven and bread from a bag. Neither is wrong; they are different products.

Seasonality matters. Shiboritate (絞りたて) — new-pressed sake released in winter — is often nama, and drinking it in January is the closest most people get to standing in the brewery.

The three half-measures

Japanese labels distinguish carefully between the stages, and it is worth learning the three terms because they tell you exactly how fragile a bottle is.

Term	Pasteurised…	Fragility
Namazake (生酒)	Never	Highest — cold at every step
Namachozo (生貯蔵酒)	Once, at bottling — stored raw	Medium
Namazume (生詰め酒)	Once, before storage — bottled raw	Medium
Standard sake	Twice	Lowest

Namachozo keeps some of the freshness of storage-in-the-raw with the stability of a final heat treatment. Namazume — often sold as hiyaoroshi in autumn — is stored pasteurised, matures over the summer and is bottled without a second heating.

Both are considerably more forgiving than true nama, and both are a sensible place to start if you cannot guarantee a cold chain.

Buying nama safely

This is where the whole thing succeeds or fails, and it is entirely about temperature.

Do not buy nama from a shop that stores it at room temperature. This is the single most reliable test of whether a retailer understands sake. A shop that keeps nama on a warm shelf either does not know or does not care, and both are reasons to buy elsewhere.

Do not order nama by post unless the retailer explicitly describes cold shipping. Not "we ship carefully" — an actual description of refrigerated or insulated shipping. Most do not, and a bottle that spends two summer days in a van is a different drink by the time it arrives.

Buy it locally if you can, from a specialist with a chilled cabinet. This is one of the few cases where a physical shop genuinely beats mail order.

Drink it soon. Weeks unopened, days once opened. It is the most perishable thing you will put in your fridge.

If you want to send sake as a present, nama is the wrong choice unless you are handing it over in person.

How to tell a bottle has gone wrong

A warm-damaged nama is not dangerous — the alcohol and acidity see to that — but it will not taste like it should:

• Flat and flabby, with the fresh green notes gone
• Stale, cardboard-like aromas (hine-ka)
• Cloudiness in a bottle that should be clear, sometimes with a sour edge — that is hiochi bacteria, and the bottle is finished

None of this will hurt you. It just is not what you paid for.

How to serve it

Cold, 5–10°C, in a wine glass rather than a ceramic cup. Nama's whole appeal is aroma and freshness, and both are better delivered by glass.

Never warm it. Warming nama removes the only reason to have bought it.

Full guidance on which styles suit which temperature is in our serving temperature guide, and the storage rules for everything else are here.

The short version

1. Nama is unpasteurised sake — fresher, livelier, more fragile.
2. Cold at every step, from brewery to glass. No exceptions.
3. Namachozo and namazume are the forgiving middle ground.
4. Never buy it from a warm shelf, and never post it without cold shipping.
5. Serve cold in a glass, drink it soon, and do not warm it.

Last verified 5 August 2026.