OK, here's the deal. I started losing a LOT of hair around 35. Lots of trips to doctors, blood tests, dermatologists - no one could explain why - and I was in tears. Of course, you have to realize this is not a SOLUTION for thinning hair just like MAKEUP is not a solution to make your face permanantly more even-toned.
This is a REALLY sensitive subject for me at my age and I am not ready to have hair implants or transplants due to cost.
You want to try this. Find the color that matches as best you can - dust it in before you 'finish' your hair. Your blinding white scalp will not be as noticeable. My Mom was a TOTAL SKEPTIC and she was SHOCKED at how you cannot notice it at all. So much so, that she became a convert and starting using her own (though we mixed two colors for her). We also told an older friend and she tried a small container - she has severe thinning - she loves it but said she 'saves it for special occasions' (like going out) because she likes to do most of her head and 'doesn't want to run out too quickly.'
I have one specific spot (crown of head, dark long hair) and I use it daily. I REALLY feel more confident knowing that I don't have an obvious 'split/hole' down the back of my head. Again, not a solution, but it helps minimize how noticable it is. I highly recommend it. Start with a small container until you are sure you have the right color for your hair.
Update 15 May. Another nice side benefit is that these little "fibers" adhere to your hairs, giving your hair a little more texture - so it is even easier to get coverage over your spots. If you are reading this review, you're interested in something to help you along. Try this and have your biggest skeptic look - I think both they and you will be pleasantly surprised. I'm hooked for sure.