Most protein powder in Australia carries a best-before date, not a use-by date. Food Standards Australia New Zealand (FSANZ) says a best-before date is about quality: food should still be safe for a while after it, but it may have lost some quality. A use-by date is about safety, and food should not be eaten after it. So a sealed, well-stored tub that is a little past its best-before date is usually a quality question first. Check which date your tub has, then check the powder itself.
Best-before vs use-by at a glance
| Best-before | Use-by | |
|---|---|---|
| What it is about | Quality | Safety |
| After the date | Should be safe for a while, may have lost some quality | Should not be eaten |
| Can shops sell it after the date? | Yes, if the food is still fit to eat | No |
These rules come from the Food Standards Code and apply to an unopened pack stored the way the label says.
What changes in an old tub
Dry powder holds up well when it stays dry and cool. Over time, and faster in heat or humidity, you may notice:
- Flavour fades. The shake tastes flatter or a bit stale.
- Mixability drops. Powder that has taken on moisture clumps and does not dissolve as cleanly.
- Colour shifts. Some powders darken slightly with age.
None of these are dangerous on their own. They are signs the tub is past its best.
How to check a tub before you use it
- Read the date mark. If it says use-by and the date has passed, bin it.
- Look. Any mould, wet patches, insects or hard lumps that will not break up mean it goes in the bin.
- Smell. A sour, rancid or musty smell is a no.
- Taste a small amount mixed in water. Bitter or off means stop there.
If the seal was broken when you bought it, or the tub has been stored open, wet or in a hot car, do not rely on the date at all. When in doubt, throw it out.
How to make protein powder last
- Keep the lid on tight and store the tub in a cool, dry cupboard, not above the stove or in the car.
- Use a dry scoop. A wet scoop is the fastest way to ruin a tub.
- Leave the powder in its original tub so you keep the label, batch number and date.
- Buy the size you will finish. If a 5 lb tub takes you six months, a 2 lb tub may be the better buy. See 2 lb vs 5 lb tubs: how much do you save?
Why close-to-date tubs are cheaper
Retailers discount stock that is getting close to its best-before date so it sells while it is still at its best. If you go through a tub in a few weeks, that can be good value. Our clearance range shows the date on the product page where it applies, so you know what you are buying before you order. For everyday pricing, compare cost per serve in our protein value guide or browse all protein powder.
Does this apply to pre-workout and creatine too?
The date rules are the same for any packaged food sold under the Food Standards Code. Pre-workouts and other powders that pull in moisture tend to clump sooner, so storage matters even more. Capsules, oils and products regulated as medicines can follow different rules, so read the label and follow it.
Quick answers
Is it illegal to sell protein past its best-before date? No. FSANZ says food with a best-before date can legally be sold after that date as long as it is fit for human consumption. Food past a use-by date cannot be sold.
Does protein powder lose protein after the date? FSANZ notes food past its best-before date may have lost some quality. How much depends on the product and how it was stored.
How long after opening should I use it? Follow the storage directions on your tub. The date mark is set for an unopened pack.
Sources: Food Standards Australia New Zealand, Use-by and best-before dates. This article is general information, not medical advice.
