Does the quality of fish oil/omega-3 deteriorate quickly?

[omega-3-links]
Question:
I have heard that the quality of fish oil/omega-3 deteriorates quickly. Is that right? Will the quality of the fish oil be maintained when I buy more bottles?

Answer:
It is indeed the case that the quality of fish oil/omega-3 can deteriorate quickly. For that reason antioxidant is often added. Several substances can be used for that cause. We chose the antioxidant natural mixed tocopherols (vitamin E). The fish oil/omega-3 will then remain well for a longer period of time (about two years).