I have been purchasing on and off from this company for the past 4 years. The one product that I bought from them, was very expensive, and I noticed that it started to dry out, even when keeping it sealed. Since I had incorporated that particular ingredient in my formula, I went ahead and ordered another bottle, and noticed within a few months of keeping it stored and sealed, it had dried out as well (most likely from the same big batch), rendering the product useless and not effective for its purpose. After having contacted the company, they asked for proof. I sent them images of both the bottles and time I purchased them. I requested for the last bottle which was barely used to be replaced, and since then have contacted them 2 more times, and got absolutely no response. So disappointed and the lack of customer service, its like they want you not to do business with them and look elsewhere.