A good tip when you are looking for corrective treatment products for anti-aging, pigmentation, acne etc. ... look for products that are in pump or squeeze dispensers/containers and not jars. When a jar is opened it starts the oxidation process, and each time it is opened the active ingredients in it become less and less effective.
Pump or squeeze dispensers/containers will not oxidize as quickly so the active/key ingredients will stay effective longer. You will get a lot more bang for your buck this way and will be able to correct your skin more quickly because your key ingredients will be more effective.