This Review Title is empty tube of serum and the content is: I bought this set so I could try the products before buying. I was particularly interested in the serum. All the samples had product in them except for the serum which was all air in the tube. How am I supposed to know if I would like to purchase the serum? I feel robbed..There are other information for this review, one is This reviewer did purchase it and the other is 24 people think this review is helpful.