Review title is Great customer service, poor product. [SEP] I really had high hopes for this serum. Based on the reviews I was downright excited about starting to use it and compared to the others on Amazon, it is listed at a great price. However, when I opened my bottle it had a very strong chemical smell and it was brown. I used it anyway thinking it would be ok (no pain, no gain, right?!) but then vaguely remembered that someone's review said it smelled great. I got concerned and did some research and found that the serum is supposed to be clear not brown and that once it's brown it means it has undergone oxidization and it is no longer effective. I contacted the seller and they were amazing, sent me a second bottle within days, no questions asked!! (Hence the two stars on this review) However, I received my second bottle today and it also has a strong chemical smell as well as it is brown in color. I went ahead and returned both for a refund. I'm not sure how long these bottles have been stored but it's clear that the serum is not fresh. (Zero stars for the product). I do have to commend the seller though, great customer service and I wish the serum had worked out.