I bought my flax seed oil in actual oil form, not in the capsules. I read on another post that it's better to get the capsules because the oil can go bad quickly, being exposed often to oxygen. I was just wondering how to tell if the oil has gone bad. I've been using this bottle for a month, at least, maybe two months. I do put it in her food, not on her back. I will throw the rest away if there's any hint of it being bad, and get capsules instead, I just wanted to know what to look for. I'd feel horrible if Lily got sick because it went bad and I didn't know.