Does Protein Powder Expire?

Does Protein Powder Go Bad?

Protein powder does go bad… eventually. Yet, the amount of time it takes to go bad depends on a number of factors, so it’s difficult to give a definitive answer.

How Long Does It Last After Opening?

Opened protein powder will last up to two years, depending on two factors:

Once opened, all protein powders will slowly begin to deteriorate. However, protein powder has an extremely long shelf life, and you can often use them beyond the use-by date (expiration date).

Ensuring open protein powder is properly stored is a crucial element in keeping the powder usable. Failing to do so will result in a shorter shelf life, so use protein past its best-by date at your own risk.

The type of protein affects the shelf lives of your protein powders, which is something you might not have thought about (I know I never did in the past).

Whey Protein Powders

Whey protein powders are popular due to their fast absorption rate and positive effect on muscle gain.[1]

However, as whey protein is a byproduct of dairy, it contains milk proteins and sugars, which will break down, causing the supplement to go “bad.” This is generally why manufacturers place an expiration date on the package.

Whey protein lasts around 9-19 months (depending on its packaging and storage), but from my experience, you can use them for a few months after the best-by date.

Casein Protein Powders

Like whey protein powder, casein is a dairy product and WILL eventually go bad (as all milk-based products do). It has the same amino acid profile as whey, its only difference to whey is the absorption rate in the body which is much slower.

I often use casein before bed for a slow release of protein while I sleep, which research suggests helps with muscle mass.[2]

Casein protein powder lasts around 12 months, and like whey protein, you can usually use it for a few months beyond the sell-by date.

Plant-Based Protein Powders

If you're a vegan and use plant-based protein powder, you'll be pleased to know that they last the longest.

They usually last for a full two years, which is pretty awesome if you ask me (and is longer than most whey proteins will last).

How Long Is Protein Powder Good After Expiration Date?

After protein powder expires, you can expect it to last for 9-24 months, depending on the type of protein and whether or not it’s been stored properly.

So long as you haven’t noticed any physical and chemical changes in the product, it should be ok to use it a few months beyond the date stamped on the package.

However, keep a close eye on dairy-based powders as food safety experts state they’ll degrade faster.

What If It’s Expired But Unopened?

If your protein is unopened, then your expired protein powder should be ok to use several months past the "safety date."

Protein powders are low-moisture foods that contain additives and preservatives. This is beneficial to the consumers as it helps maintain the quality for longer.

How To Know If It Has Gone Bad?

Protein powder can go bad over time, and consuming expired protein powder can lead to digestive issues (stomach pain) or other adverse effects.

To tell if your protein powder has gone bad, look for the following signs:

Bad Smell

A strong or rancid smell can be a telltale sign your protein supplements have gone bad.

Depending on the flavor, fresh protein powder typically has a mild, neutral, or slightly sweet smell. If it smells sour, musty, or otherwise unpleasant, it's likely no longer safe to consume.

Changes In Texture

Quality protein powder should have a fine, consistent, and smooth texture.

If you notice any changes, such as clumping, lumpiness, or a caked appearance, these could be signs that the powder’s dry environment has been exposed to moisture or contaminants and may be spoiled. - This could lead to foodborne illness, be wary.

Discoloration

Fresh protein powder should maintain a uniform color. If you see any unusual color changes, such as dark patches or spots, this could indicate spoilage. This is especially true if the protein shake color changes are accompanied by other signs of spoilage, such as an off smell or altered texture.

Mold or Insects

Mold, bacterial growth, or insect infestation clearly indicates that your protein powder is no longer safe to consume.

If you spot mold growth, insects, or any other foreign particles in your protein powder container, dispose of the product immediately to avoid health risks. No amount of additives can solve these issues.

Taste Test

Once you've inspected the protein powder and found no visible signs of spoilage but still have doubts, you can try a small taste test.

If the powder has a sour or bitter taste or seems off in any way, it's likely gone bad, and you should discard it.

Expiration Date

Obvious I know... but the expiration date printed on your protein powder helps to indicate the product's shelf life.

Although some protein powders may still be SAFE to consume shortly after this date, it's best to err on the side of caution and dispose of the product once it has expired.

To extend the shelf life of your protein powder and prevent spoilage, follow these storage tips:

If you store protein powder correctly, you’d be shocked by how long the shelf life of the product increases. I’ve got some Chocolate Hazelnut whey protein in the cupboard, and it still tastes great (gotta love artificial flavors).

Is It Safe To Use Expired Protein Powder?

It’s not recommended to use expired protein powder, as its quality, safety, and nutritional value may be compromised.

Although it MIGHT be safe to use protein powder up to 1 year after the expiration date if stored properly, the risk of spoilage and reduced quality increases over time.

Is expired protein powder safe to use 2 years after the date on the tub?

Short answer: Probably not; it’s likely to have significantly broken down during that time and could cause illness. The benefits of taking expired protein are outweighed by the risks, in my opinion.

I suggest you follow these guidelines for most types of protein (even if different types break down differently over time).

Protein Powder Expiry Questions

Is Expired Protein Powder Worth The Risk?

Wondering whether using expired protein is worth the risk? - It depends on a few factors, such as the type of protein and the storage conditions.

If you’ve kept your protein in a cool and dry location with the package firmly fastened, then you SHOULD be able to use the protein for a few months beyond the expiration date.

However, the amount of time you have to use the product DEPENDS on the type of protein. Whey and casein won’t last as long as other protein powders (non-animal products like plant protein).

References: 

1. https://academic.oup.com/eurpub/article/30/Supplement_2/ckaa040.004/5862087
2. https://www.tandfonline.com/doi/full/10.1186/s12970-018-0228-9