The reviewers saying this serum is making their hair feel stiff and crunchy, etc., are slaying me and cracking me up, because they're so very unclear on the concept. It's. For. Your. SCALP. That's where the follicles are. You apply it to your SCALP, NOT your HAIR. XD From where do you think hair grows? Other hairs, like a tree branch? Ay, yi, yi. Anyway, this really does work, but you're not going to witness a miracle occurring or get the same results as you would from Minoxidil. It seems the primary active ingredient is biotin, which has been shown in studies to work if you take it in oral form; not sure about if you apply it topically. However, I have seen some teeny extra baby fluff right around my temples so it does work. :) I don't really have a hair thinning problem, though (sorry lol) - I'm just trying to maintain the ton of wavy hair I have. ;) It's baby-fine but dense (like I said, I have a LOT of hair) and I'm well aware that one can lose density as one ages...but, then again, my mom kept her full head of hair until she passed in her late 90s. So there ya go. ;)

It seems to me that this product actually does work, it has taken a few months but my hair feels thicker and fuller and it has been growing. I will continue to buy this product and the price point is reasonable as well.

The product is easy to use and with the spray nozzle. I use every night and believe it has stimulated new hair growth. I have used for over a year.

I am in my early 60's and noticed some parts of my hair on top looked thin so I started using this a year or so ago and have noticed an incredible difference and have seen some hair growth in my bang area. I spray on dry hair and after I shampoo I spray again on certain areas where my part looks wider.

I was noticing quite a bit of hair loss every time I would shampoo my hair so thought I would try this. I am noticing less hair loss since using this so will continue to use this product.

I absolutely love this thickening serum. My fine thinning hair has body and texture that I didn't think was possible. When I hold a handful my hair literally feels thicker and stronger. Bonus: it's super soft and manageable!

I haven't used this product long enough to know if it strengthens my hair follicles, but I am hopeful that it will over time. I bought this product several weeks ago and haven't seen my hairdresser yet to get her opinion. I hope to report back in another month.

I've only been using the product for two weeks, so no visible results yet. However, applying the product is very easy and once I dry my hair I cannot tell that it is there. Still smooth and soft! I'm really hoping regrowth begins soon!

This product works very well when followed with the Keranique Repair and Lift Spray. Fuller hair, and nice texture.

Tried for a few weeks. Smell was pleasant but didn't see a noticeable difference. Left hair crunchy and stiff.