Yeast Nutrient for Wine: Why It Matters (and Can You Use Bread Yeast?)

Stuck fermentations, rotten egg smells and wines that never quite finish are some of the most common problems in home winemaking, and most of them come back to the yeast: either the wrong yeast, or the right yeast without enough to eat. This guide explains what yeast nutrient is, when you need it, and why a proper wine yeast beats bread yeast every time.

What Is Yeast Nutrient?

Yeast needs more than sugar to ferment well. It also needs nitrogen to build healthy new cells, plus vitamins and minerals. Grape juice naturally contains plenty of these, but many of the things we ferment at home don't. Yeast nutrient tops up what's missing. Most standard nutrients are based on diammonium phosphate (DAP), a readily available source of nitrogen.

Nutrient vs energiser: nutrient mainly supplies nitrogen. An energiser adds vitamins and minerals as well and is more useful for rescuing a sluggish ferment. For most home wines, standard yeast nutrient is all you need.

When Do You Need Yeast Nutrient?

Yes, add it for:

• Country and fruit wines (elderberry, blackberry, apple, plum and so on). The fruit is diluted with water and sugar, so there isn't enough nitrogen left for the yeast.
• Mead. Honey is very low in nutrients, so mead almost always needs help. Without it, ferments can take months or stop completely.
• High-sugar recipes, like strong wines and sugar-based washes, where the yeast has a lot of work to do.

Usually not needed for:

• Grape juice wine kits. Grapes are naturally rich in nutrients and most kits include what the yeast needs. Follow the kit instructions.
• Beer kits and all-grain beer. Malt contains plenty of nitrogen for the yeast.

What Happens Without It?

Short of nitrogen, yeast gets stressed. You may see:

• A slow fermentation, or one that stops before all the sugar is used (a stuck fermentation), leaving a sweet, weak wine
• A rotten egg smell (hydrogen sulphide)
• Harsher, less clean flavours

How to Use Yeast Nutrient

• Add it at the start, with the yeast, following the dose on the pack (typically around a teaspoon per gallon).
• For mead, many makers split the nutrient into two or three smaller additions over the first few days of fermentation.
• Don't overdo it. Excess nutrient can leave off-flavours and give spoilage organisms something to feed on.

Making a country wine and want it simple? Young's Super Wine Yeast Compound combines yeast and nutrient in one.

No nutrient to hand? Traditional country wine recipes often add a handful of chopped raisins, which provide some nutrients and body. It helps, but it's far less reliable than a measured nutrient.

Can You Use Bread Yeast for Wine?

Technically yes: bread yeast will ferment sugar into alcohol. But you'll almost always get a worse wine, for several reasons:

• It gives up early. Bread yeast is bred to produce gas quickly in dough, not to survive rising alcohol. It usually stops well before a wine yeast would, leaving a wine that's weaker and sweeter than intended.
• Off-flavours. It tends to leave bready, yeasty flavours that don't belong in wine.
• Poor clearing. Wine yeasts are selected to settle into a firm sediment. Bread yeast stays in suspension longer, so the wine is cloudier and slower to clear.
• Unpredictable results. Wine yeasts are chosen for specific jobs: dry whites, full reds, sparkling wine, fruit wines, restarting stuck ferments. Bread yeast isn't chosen for any of them.

A sachet of proper wine yeast costs less than £2, so it's rarely worth the risk to a whole batch of fruit and sugar. See where to buy it in our guide: Where to Buy Wine Yeast in the UK.

Why the Right Yeast Matters

Different yeasts produce different results, even from the same juice. A good all-rounder like Gervin GV1 works for most country wines, while specialist strains suit particular styles, such as GV8 for red wines, GV9 for whites and GV11 for red fruit wines. If a ferment has stalled, GV7 is designed to restart it.

Compare every strain side by side in our Wine Yeast Selector, or read our Home Brew Yeast Guide for beer, cider and distilling yeasts too.

Frequently Asked Questions

Do I need yeast nutrient for wine?

For country wines, fruit wines and mead, yes. For grape juice wine kits, usually not, as grapes contain plenty of nutrients and kits include what the yeast needs.

What does yeast nutrient do?

It supplies nitrogen (and sometimes vitamins and minerals) so yeast can build healthy cells and finish fermenting cleanly, avoiding stuck ferments and rotten egg smells.

How much yeast nutrient should I use?

Follow the dose on the pack, typically around a teaspoon per gallon. Don't overdo it.

Can I use bread yeast to make wine?

It will ferment, but it usually stops early, leaves bready flavours and clears poorly. A wine yeast gives a much better, more reliable result for very little cost.

What can I use instead of yeast nutrient?

A handful of chopped raisins is the traditional substitute in country wine recipes. It helps, but a measured yeast nutrient is far more reliable.