How To Check If Your Skincare Product Has Expired

Have you ever found a forgotten cream at the bottom of a drawer and wondered if it was still good? You're not alone. Most of us unknowingly use skincare products much longer than recommended. And what's worse: expired products not only lose effectiveness, but they can also irritate, clog pores, or even cause skin reactions.

Expiration Date vs. PAO Symbol

The first thing you should know is that cosmetics have two types of shelf-life indicators:

The expiration date (DD/MM/YYYY format) appears on products with a shelf life of less than 30 months. If your product has this date, it is a strict limit—do not use it after that date.

The PAO symbol (Period After Opening) is much more common. You'll recognize it as a small open jar with a number followed by an "M," for example, 6M, 12M, or 24M. That number indicates the months the product remains safe and effective after opening, regardless of when you purchased it.

How to Calculate if Your Product Has Expired

It's simpler than it seems:

• Look for the PAO symbol on the packaging, usually on the bottom or back.
  
  
• Remember when you opened it; if you don't remember, write it down with a marker next time.
  
  
• Add the indicated months to the opening date.
  
  
• If you've passed that time frame, it's time to replace it.

For example: if you opened a cream in January and the PAO indicates 6M, it should be replaced by July.

Signs That a Product Has Expired

Sometimes your senses are your best tool. These are the clearest signs:

Change in smell — If it smells different from when you bought it, especially if the smell is stale or sour, it's an immediate warning sign.

Change in texture or color — A cream that has separated, a serum that has turned cloudy, or a product that has changed color is oxidized or contaminated.

Unusual irritation — If a product that has always suited you suddenly causes redness or itching, it may have expired.

Change in effectiveness — If you notice that it no longer does what it used to, the active ingredients have probably degraded.

Products That Expire Faster

Not all products have the same shelf life. These are the ones you should watch most closely:

• Vitamin C: Oxidizes easily. A Vitamin C serum that has changed color to dark yellow or orange has already lost much of its potency.
  
  
• Retinol: Very sensitive to light and air.
  
  
• SPF: Sunscreen expires and loses effectiveness, which can leave you exposed without realizing it.
  
  
• Natural products without preservatives: Have a much shorter shelf life.
  
  

Why This Is Different at TSA

At The Spanish Alchemist, we produce in daily batches and ship within 48 hours from our lab in Alicante. This means that when you receive your product, its active ingredients are at their peak potency — they haven't been sitting in a warehouse for months losing effectiveness.

Even so, as with any high-performance cosmetic, we recommend finishing the container within 3 months of opening to ensure that the encapsulated active ingredients, especially Vitamin C and peptides, perform at their best.

Final Tip: The Habit That Changes Everything

Write the opening date on each product with a permanent marker. Thirty seconds that can save you irritations, money, and disappointments. Your skin will thank you.