Using Cosmetic Ingredients Past Expiration Date

You have several cosmetic ingredients that are past their stated expiration dates but have remained unopened and stored in the refrigerator. The ingredients are Lactic Acid (AHA) 88%, Vitamin B3 (Niacinamide) Ultra-Low Niacin, and Glucosamine (N-acetyl-D).

Generally, expiration dates on cosmetic ingredients indicate the period during which the product is expected to remain stable, potent, and safe under recommended storage conditions. Using ingredients past this date means that the manufacturer can no longer guarantee the product's full quality and effectiveness.

However, as the staff previously mentioned, if these ingredients have been stored correctly (unopened and refrigerated), they may still be usable. The primary concern is that their potency or effectiveness might be reduced compared to when they were fresh. For example:

• Lactic Acid (AHA) is an alpha hydroxy acid used for exfoliation and improving skin texture. Its acidity and efficacy are key to its function.
• Vitamin B3 (Niacinamide), such as Safe-B3™, is known for its benefits in reducing wrinkles, hyperpigmentation, controlling oil, and strengthening the skin barrier. Its purity and concentration are important for these effects.
• Glucosamine (N-acetyl-D), like GlucoBright™, often used with Niacinamide, helps with whitening, reducing dark spots, and stimulating hyaluronic acid production.

While these ingredients might not be harmful to use past their expiration date if they appear unchanged (no discoloration, strange odor, or change in texture), their performance in a formulation might be less pronounced than expected. You may choose to use them at your own discretion, keeping in mind the potential for reduced results.

For optimal results and safety in your formulations, it is generally recommended to use ingredients within their stated shelf life.