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Poolish vs Biga vs Levain

Preferments are portions of the dough that ferment before the final mix. They bring flavor, timing, and texture into the formula before the main dough even starts.

What a preferment changes

A preferment gives part of the flour a head start. Enzymes begin breaking starches into sugars, yeast or sourdough microbes start fermentation, and the dough gains aroma before final mixing. The important rule is simple: preferment flour and water still belong to the total formula.

Poolish

Poolish is a wet commercial-yeast preferment, commonly built at 100% hydration. It tends to make dough more extensible, which means it stretches with less resistance. That can help open a delicate pizza, but the wet build can also make the final dough feel looser if you do not subtract its water correctly.

  • Best when you want: extensibility, mild sweetness, an open feel.
  • Watch out for: sticky dough and overripe poolish.
  • Memory hook: poolish pours.

Biga

Biga is stiffer, often around 50-60% hydration. It usually brings more strength, chew, and a wheatier aroma than a wet poolish. Because it is firm, it can be harder to mix evenly into the final dough, but it is useful when you want structure without making the dough feel slack.

  • Best when you want: chew, structure, controlled extensibility.
  • Watch out for: dry bits if it is not mixed well.
  • Memory hook: biga breaks into chunks.

Levain

Levain is a sourdough preferment made from a mature starter. It brings wild yeast and lactic acid bacteria, so it affects leavening, flavor, acidity, and dough strength. A young levain can taste mild and lift well. A very ripe levain can bring more acidity, which may add flavor but can also weaken dough if pushed too far.

Choosing the route

Use poolish when you want easier stretching and a lighter feel. Use biga when you want chew and structure. Use levain when sourdough flavor and natural fermentation are the point. No preferment style is automatically better than the others. The right choice is the one that solves the problem your dough actually has.

  • If the dough fights you, poolish may help extensibility.
  • If the dough feels weak, biga may help structure.
  • If flavor is flat, longer fermentation or levain may help more than extra yeast.