Is the packaging important?

Dr. Irwin
April 8, 2010
Hi Dr. Irwin I have heard that products that are packaged in jars are not stable and that as soon as you open the jar the light diminishes the effect of the ingredients. Is this true?

This is true mostly for antioxidants which, on exposure to air (just like fruit), start to deteriorate slowly.   The best packaging for these is air-free.  But, if you open a dark glass bottle of vitamin C serum and use it over a period of a couple of months, it should be fine.   Dr. I

Dr. Brandith Irwin, MD

Ask me your skincare question!

Hi, I’m Dr. Irwin. I believe that consumers deserve a medically trained and unbiased skin care advocate.

  • All our content is written and researched by myself.
  • My medical office in Seattle has treated thousands of patients for 15+ years.
  • This site is not affiliated or financially tied to any product, treatment or device.
Ask Me Something
SkinTour Skincare
One of the best investments in your skin is your daily skincare. Why? Because you can prevent many problems with blotchy skin color, lack of glow, texture, some types of acne, and fine lines with good skincare products. You can also correct some of these problems with effective skincare products. Great skincare is often more expensive because quality ingredients are expensive. Some companies spend on research/development which benefits all of us and adds to the cost. Are they worth it? In general - yes! I have handpicked some of what I consider to be the best skin care products, and offer them for sale on SkinTour's shop. This is based on my team and I's testing and research at our clinic. Many of the products are in my own regimen. What could be better than using skin care products a dermatologist uses?!
Browse Shop