1. Preservative Stability and Product Protection:
Airless Options: Many modern jars are "airless." They have a false bottom that rises as you use the product, pushing the cream up without letting air back in. This is a huge advantage because it:
Minimizes Contamination: Prevents bacteria, dust, and oxygen from degrading the active ingredients.
Preserves Potency: Air-sensitive ingredients like Vitamin C, retinoids, and peptides remain effective for much longer.
Extends Shelf Life: The product doesn't break down as quickly.

