Supplement shelf life: what does the date really mean?

Shelf life is something we often pay attention to with food, but when it comes to supplements, it can raise questions. What exactly does that date mean? And can you still use the products once it has passed?

In this blog, we explain how the shelf life of supplements is determined, why some products have a shorter shelf life and what it actually tells us about quality.

What determines a supplement's shelf life?

As well as guaranteeing that a supplement will not spoil within its stated shelf life, determining its shelf life starts with a question: will the ingredients remain stable and effective throughout the time the product is in your cupboard? This is assessed through practical testing and the use of European standards.

Stability and testing

The shelf life of supplements is closely linked to the chemical stability of their ingredients: the extent to which a product retains its composition and effectiveness. Manufacturers test this thoroughly before a product reaches the market. They check whether the vitamins, minerals and plant compounds remain as potent and safe over time as they were when the product was made.

These tests are often carried out under ‘accelerated conditions’, for example at high temperatures or increased humidity, to see how long a product keeps. The best-before date is set on this basis.

Standards and tolerances in practice

Alongside these practical tests, European agreements also set out how much the actual amounts of vitamins and minerals may differ from those stated on the label. This helps keep legislation in line with everyday practice.

Under European guidelines, the actual amounts of vitamins and minerals in a supplement may differ slightly from those stated on the label. The European Commission has set a tolerance range for this, which is also used in the Netherlands by the NVWA. In practice, this means that vitamin levels may usually range from around 80% to 150% of the declared amount. For minerals, this range is roughly 80% to 145%, including measurement uncertainty.

Manufacturers take this into account. At the start of its shelf life, a product may deliberately contain slightly higher levels, so that it still contains at least the promised amount by the best-before date. This ensures its effectiveness throughout the stated period.

The IADSA (International Alliance of Dietary/Food Supplement Associations) also provides practical guidelines to help manufacturers manage supplement stability and shelf life [source].

What affects shelf life?

Not all supplements are the same. The form (capsule, powder, liquid) and the ingredients make a big difference.

Liquid supplements

Water provides a natural breeding ground for microorganisms such as mould and bacteria. Liquid supplements are therefore often more susceptible to spoilage and have a shorter shelf life as a result. They usually need to be kept cool, sometimes even in the fridge.

Chemical stability in a liquid also plays a role. Some substances remain stable in liquid for longer than others. For example, zinc sulphate is much more stable than zinc methionine, which is more prone to breaking down. Substances can also react with one another, shortening the shelf life.

Powders and capsules

Dry powders and capsules are better protected against bacteria, but they can react to oxygen, light or moisture. Vitamin C is a good example: it oxidises quickly, causing the amount of active ingredient to decrease gradually. This means that a jar of vitamin C past its best-before date is often still safe, but contains slightly less active ingredient than stated on the label.

You may sometimes notice a powder clumping or changing colour. This does not necessarily mean the product has spoiled. With our plant-based powders, which contain no additives, this is normal. Moisture in the air can cause them to clump together. Tip: briefly blend the powder in a food processor to loosen it up and make it usable again.

What does the date on the packaging mean?

The date on supplements is usually a best-before date rather than a use-by date.

The best-before date is a quality guarantee: until then, we can guarantee that the product still contains what is stated on the label, for example “100 mg of vitamin C per capsule”, and that its smell, colour and texture are normal.

Use-by dates are mainly found on highly perishable products, such as fresh, chilled foods. With supplements, the main concern is usually the chemical stability of the ingredients. Spoilage caused by microorganisms is only a factor with some liquid products or products that have been stored incorrectly.

After the best-before date, the amount of active ingredient usually decreases gradually, but the product does not become unsafe overnight. Use your senses: look, smell and taste. Has the colour, smell or texture changed significantly, or can you see mould or signs of gas forming? Then it is time to replace the product.

So if you are wondering whether you can still use vitamin tablets past their best-before date: usually you can, as long as they have been stored properly and still look and smell normal.

When is it best to stop using a supplement?

Although a food supplement's best-before date is usually the last date on which the supplier guarantees its quality and effectiveness, and therefore not necessarily the last date on which you can use it, there are some supplements that should not be used after their best-before date.

These include omega products made from fish oil or algae, and probiotics. Products containing omega 3 can oxidise over time, potentially forming substances that may be harmful to health. This risk does not usually apply to probiotics, but a probiotic past its best-before date may contain significantly fewer live bacteria than stated on the label. Do you notice a clear change in smell, colour or texture after the best-before date? Then it is better to throw the product away.

How do we guarantee quality?

Before a supplement reaches the market, it is thoroughly tested for stability, purity and safety. Among other things, our manufacturers carry out accelerated shelf-life tests, for example at 40 °C instead of 20 °C, to see how ingredients behave over time.

Manufacturers also keep what are known as retention samples: reference samples are set aside from every batch. These can be tested again later, for example halfway through or at the end of the shelf life, or in the event of a serious complaint. This makes it possible to demonstrate that the product still meets our requirements towards the end of its shelf life.

At Morgen is Nu, we work in accordance with Dutch legislation and guidelines from organisations including the NPN (the Dutch trade association for food supplements). Only products that meet our high standards make it into our webshop. This gives you reassurance that what you buy is as described and safe to use.

Why some supplements have a shorter shelf life

A short shelf life does not mean a product is of lower quality. Products without preservatives or stabilisers are more natural, and therefore often have a shorter shelf life. Liquid products and natural oils also often have a shorter shelf life: they contain sensitive substances that react to oxygen and light.

Storage tips for home

Storing your supplements correctly keeps them safe and effective until the stated date. Here are our tips:

Store supplements in a cool, dry, dark place.
Close the packaging tightly after use.
Avoid damp rooms such as the bathroom.
Use liquid products within six months of opening, unless otherwise stated.

This helps preserve their quality, so you can feel confident in their effectiveness.

Unsure about your product's shelf life?

A good supplement remains valuable as long as it is made, stored and used with care. At Morgen is Nu, we believe quality goes beyond a date on the label. It is about trust, knowledge and care, for your health and for what nature gives us.

Do you have questions about a product or are you unsure about your supplement's shelf life? Our knowledgeable team is here to talk things through and offer honest advice. Together, we help you use your products with confidence.

Written by Danielle , last updated 11-11-2025

Frequently asked questions about shelf life

1. How long do supplements last?

Most supplements have a shelf life of one to three years. The exact length of time depends on their form and composition: capsules and powders generally remain stable for longer than liquid supplements. Manufacturers determine the best-before date through extensive stability testing, so quality is guaranteed until that date.

2. What exactly does the best-before date on supplements mean?

The date on the packaging is a guarantee. Until that date, we guarantee that the product still contains the stated amount of vitamins, minerals or plant compounds. After that, its effectiveness may gradually decline, but the product does not suddenly become unsafe. Always use your senses: if it looks, smells or tastes unusual, replace it.

3. Why do some products have a shorter shelf life?

Some supplements, especially liquid formulas, are more sensitive to microorganisms and light. Water provides a breeding ground for mould and bacteria, which shortens shelf life. Natural ingredients without preservatives also react more quickly to oxygen.

4. Can you take vitamin tablets past their best-before date?

Yes, usually. Vitamin tablets past their best-before date gradually lose some of their potency, but are rarely harmful. Pay particular attention to smell, colour and texture. If a product still looks and smells normal, it is often still safe to use. It may simply be slightly less effective.

5. What happens when a supplement is past its best-before date?

A supplement does not automatically “go off” like fresh food, but slowly becomes less stable. This means that the active substances (such as vitamin C) become less potent. In powders and capsules, this usually happens slowly. In liquid products or supplements that have not been stored properly, spoilage can occur and microorganisms can start to grow. Can you see mould, notice an unusual smell or signs of gas forming? Stop using the product.

6. What is the best way to store supplements?

Store supplements in a cool, dry, dark place. Close the packaging tightly after use and avoid damp rooms such as the bathroom. Liquid products are best kept in the fridge and used within six months of opening, unless otherwise stated. This helps maintain their quality.

7. What if I am unsure about my supplement's shelf life?

Unsure whether your supplement is still good to use, or wondering exactly what the best-before date means? Our knowledgeable team is always here for you to help you work it out. We are happy to offer honest, personal advice, so you can feel confident that you are making the right choice.