Supplement Expiration Dates: How iHerb Products Determine Shelf Life

Expiration dates are an important part of supplement safety. Consumers often want to know how expiration dates are determined and whether supplements remain effective after those dates pass.

This guide explains how expiration dates work for supplements sold through iHerb and how stability testing determines product shelf life.

What Expiration Dates Mean

Expiration dates indicate the period during which a supplement is expected to maintain its labeled potency and safety when stored properly.

The expiration date is typically determined by the product manufacturer based on stability testing.

How Shelf Life Is Determined

Manufacturers conduct stability studies to determine how long a product maintains its potency.

Stability testing evaluates how ingredients degrade over time when exposed to environmental factors such as:

• temperature
• humidity
• light
• oxygen

Testing helps determine the point at which ingredient potency may fall below label claims.

Accelerated Stability Testing

One common method used in supplement manufacturing is accelerated stability testing.

This method exposes products to controlled environmental conditions designed to simulate long-term aging in a shorter timeframe.

For example, higher temperatures and humidity levels may be used to observe how the product changes over time.

Results help estimate shelf life under normal storage conditions.

Real-Time Stability Testing

In addition to accelerated testing, manufacturers may conduct real-time stability testing.

This involves storing products under normal conditions and testing them periodically over the course of several years.

Real-time testing provides additional confirmation that the expiration date accurately reflects product stability.

Why Expiration Dates Matter

Expiration dates help ensure that supplements:

• maintain potency
• remain safe to consume
• meet label claims

Because many supplements contain sensitive nutrients such as vitamins and probiotics, potency may decrease gradually over time.

Storage Conditions and Shelf Life

Proper storage can significantly affect supplement stability.

Manufacturers typically recommend storing supplements:

• in a cool location
• away from direct sunlight
• in sealed containers

Exposure to heat or humidity may accelerate degradation.

Expiration Dates and Quality Control

Expiration date determination is part of the broader quality control process used in supplement manufacturing.

• Quality control overview
• Testing procedures overview

What Happens if a Product Expires

When a supplement passes its expiration date, it may gradually lose potency.

In most cases, expiration does not immediately mean the product becomes unsafe, but manufacturers cannot guarantee its effectiveness after that date.

Consumers should generally follow labeled expiration guidelines.

Summary

Expiration dates are determined through stability testing designed to ensure supplements maintain potency and safety during their shelf life. Proper storage and adherence to expiration dates help maintain product quality.