Fermentation Guides · Yogurt
A sealed dry starter sachet and a jar of finished yogurt need different handling. Follow the sachet’s storage label before use; refrigerate the finished yogurt after it has set. “Keep in a cool, dry place” does not mean leave prepared yogurt on the kitchen counter.
Dry starter sachet
Keep sealed and follow the pack’s storage instructions and best-before date. Protect it from moisture and kitchen heat.
Finished yogurt
Refrigerate promptly once set. Use a clean, covered food-safe container and clean serving utensils.
What do Zoh’s current instructions say?
| Item | Storage instruction |
|---|---|
| Sealed Greek starter | Cool, dry place; follow the pack’s best-before date. |
| Sealed Bulgarian starter | Cool, dry place; the Bulgarian pack also recommends the freezer for extra sachets. |
| Finished yogurt from either starter | Refrigerate after setting. Dry-sachet instructions no longer apply. |
| Plain yogurt reserved for reculturing | Keep separately in a clean, covered container in the refrigerator; follow the culture’s supplied reculturing directions. |
Do not copy the Bulgarian extra-sachet freezer instruction onto a different culture. If your pack carries updated directions, follow those and contact Zoh if anything conflicts.
Make the cold chain simple
- Label it. Record when the batch was made. Keep different batches separate rather than topping up an older jar.
- Check the fridge. Aim for 4°C or below using a refrigerator thermometer. Keep the yogurt covered and away from raw-food drips.
- Serve a portion. Take out what you need and return the main container to the refrigerator promptly.
- Carry it cold. For a lunchbox or journey, use an insulated bag with cold packs and refrigerate on arrival.
FSSAI’s dairy guidance specifies refrigerated storage for cultured products, including a retail storage limit of 4°C. That cold-chain guidance supports keeping yogurt chilled; it does not establish a tested shelf life for your homemade batch.
How many days will homemade yogurt keep?
There is no single guaranteed number for every home batch. Milk quality, preparation, cleanliness, refrigeration and added ingredients all matter. Follow any finished-yogurt storage period supplied with your culture, make manageable batches and avoid borrowing the expiry date from a supermarket product.
Adding fresh herbs, chopped vegetables or fruit creates a different prepared dish. Keep track of the original yogurt’s age as well as the added ingredients. Straining it or turning it into raita does not restart the storage clock.
When should I discard it?
Discard a failed fermentation, yogurt with visible mould or unusual discolouration, or a batch with an abnormal smell. Do not taste it to investigate. A normal appearance cannot prove that a batch with an uncertain storage history is safe.
Does a little whey mean the yogurt has spoiled?
A small amount of whey separation can be normal in set yogurt. Consider the preparation and storage history too; appearance alone is not a safety test.
Can I freeze the finished yogurt as my next starter?
Do not assume this preserves the culture reliably. Follow Zoh’s reculturing directions or keep an unopened sachet as directed for a fresh activation.
What should I send support after a fridge problem?
Share the batch date, any measured temperatures, how long it was out of refrigeration and what happened. If the storage history is uncertain, do not rely on a photograph to clear it for eating.
Reference: FSSAI guidance for milk and milk products (cold-chain table, printed page 28). Starter-specific directions: Greek and Bulgarian.
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