I have not used the Peptide Labz Hair Growth Serum Spray long enough to be able to say it has been effective, but I really like the serum and the ingredients.Over the last 10 months, I’ve suffered from thinning with no medical reason…follicular miniaturization has been mentioned. My hair grows but sheds a lot, therefore, I look for ingredients that will help to create a healthy environment for my follicles and keep my roots anchored.Each of the 4 core ingredients in this serum, sound just perfect as they all seem to work to help follicles, hair root, and scalp health. Once these are healthy, the hair shedding should decrease. Also, I feel good about the ingredients after reading about a few clinical efficacy trials that showed promising results.I like the serum and especially that it’s not oily. It absorbs quickly with just a little massage. I use it 2 times per day and try to part my hair to keep from wasting the serum. I’m hoping that I can get at least 3 weeks out of the bottle. While the serum is not cost prohibitive, having to use it for at least 3 months to see optimal results gets pricey but if it works, it will be worth it.