So far, so good [SEP] I have only been using this product for a couple of days, so while I can't say that my eyelashes have grown thicker yet, they definitely already feel stronger and more conditioned. I have previously used organic castor oil for my brows and lashes; while it worked fairly well on my eyebrows (I did see improvement in thickness), I found the consistency to be strangely sticky yet some how also runny, so it would get in my eyes and cause irritation. This pentapeptide serum is much thinner, lighter, easier to apply precisely, and does not at all run into my eyes or cause irritation. I expect even more positive results to come!