Does Protein Powder Expire? How Long It Lasts

You find a half-used tub at the back of the pantry. The date on the bottom passed two months ago. Do you shake one up or throw it out?

Good question, and an easy one to get wrong in both directions. Here's what the date on a protein powder tub actually means, how long it lasts once you open it, and the signs it has gone bad.

Does protein powder expire?

Yes, protein powder has a date, but it's usually a quality date, not a safety cutoff. The USDA Food Safety and Inspection Service says that, except for infant formula, dates on food are not an indicator of safety.

A "Best if Used By" date tells you when the product will be at its best flavor or quality. After that, taste and mixing can slip.

• Before the date: best taste and texture.
• Just after the date: often still fine if it looks, smells and tastes normal.
• Any time it smells off, tastes bitter or has gone hard and damp: throw it out.

What does the date on a protein powder tub mean?

The date on a protein powder tub is set by the maker to show how long it stays at its best. The USDA lists common phrases: "Best if Used By" means best flavor or quality, and "Use-By" is the last date for peak quality.

Label says	What it means
Best if Used By	Best flavor or quality, not a safety date
Use-By	Last date for peak quality
Sell-By	For the store, not for you

"The date is about quality. If it looks, smells or tastes off, it goes in the bin."

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Step 1 of 4

Step 1: Check the date and the seal

Start with the label. Find the date on the tub and check that the seal was intact when you opened it. If the tub was sealed and stored well, a date that passed recently usually means a drop in quality, not danger.

• Write the day you opened it on the lid.
• Use older tubs first.
• If the seal was broken when you bought it, don't use it.

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Step 2 of 4

Step 2: Look, smell and taste before you drink it

The USDA says spoiled food develops an off odor, flavor or texture. It also lists moisture as one of the conditions that help spoilage bacteria grow. So look for damp, hard clumps first.

• Smell: sour, rancid or musty means bin it.
• Look: damp patches, mold or odd color mean bin it.
• Taste: a tiny sip that tastes bitter or stale means bin it.

Soft lumps that break up with a shake are usually just packing. Hard, wet clumps are moisture.

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Step 3: Store it cool, dry and sealed

How you store protein powder matters as much as the date. Keep the lid tight, the tub out of the sun and away from the stove, kettle and dishwasher steam.

• Use a dry scoop, every time.
• Don't leave it in a hot car.

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Step 4: Buy what you'll use in about a month

The simplest fix is not to have old powder at all. We've been nomads for over 10 years, so we decant a week at a time and buy tubs we'll finish, not tubs that sit.

A tub of Nourish has 30 serves. At one a day, that's a month. If you want it to arrive on a schedule, the subscription ships every 30, 60 or 90 days.

How long does protein powder last after opening?

Treat an opened tub of protein powder as good until its date, as long as you keep it sealed, cool and dry. Each time the lid comes off, air and moisture get in.

Most people finish a tub in a few weeks, which keeps this simple.

Pre-mixed shakes are different. Drink them soon after mixing, and keep them cold.

Why we drink Nourish

Nourish is our plant protein. Each serve has 20g of pea protein isolate with all 9 essential amino acids. It has zero sugar and no artificial sweeteners, and it's dairy free, soy free and gluten free.

• $47 a tub of 30 serves, about $1.57 a shake
• One scoop with 250 to 300ml of water, milk or plant milk
• Made in the USA and NSF certified

"I've tried every protein on the market. This is the first one my stomach actually thanks me for. Zero bloat, mixes like a dream, and the Salted Caramel tastes like dessert."

"No bloating for the first time EVER. I'm never going back to whey."

Results vary. A protein shake doesn't replace real meals. If you're pregnant, have a medical condition or take medication, check with your doctor first.

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