I am 17 years old. I had beautiful thick hair, unfortunately my hairdresser decided that my hair was too thick and decided to thin my hair out! Ever since my hair has not been thicker! I began seeing patches and my hair fall in the shower and on my brush devastated me! I decided to cut my hair, and my new hairdresser recommended Nioxin. She recommended me the shampoo and conditioner and some treatment spray thing (it's so expensive!! My word) but I decided to give it a shot! I began using it, and considering the fact that my hair was shorter the hairfall was relatively little. Hair loss is kinda genetic in my case, so my mum went to a hair loss specialist and he says that when you begin to use hair loss products your hair begins to fall, but give it 6 months and your hair will recover. And like the doc said : My hair began falling badly, I cried so often, I thought I was going to be bald, but I continued using the product and my hair slowly began recovering.After 4 months of using Nioxin, my hair feels healthy and looks beautiful.I honestly feel that me cutting my hair and eating lots of fruits and vegetables as well as doing some exercises improved the condition of my hair.Because ultimately, you can't expect a product to work if you're not eating the right foods. Treat yourself inside before you can treat yourself outside. Also, try not straightening your hair for a while, it helps strengthen your hair and get exposed to the beautiful sun! It's got amazing nutrients for your hair! And lastly, have faith in your product, be positive that your product will work on you.Get your Minty Hair Wacking (lovely mint scent to your hair) and be positive, eat healthy, exercise and never lose hope and we will fight this hair loss /thin hair struggle together! With regards to allergies, I have really sensitive skin, but Nioxin only tingled my scalp and caused no allergic reactions. However we are all different, if you begin to see allergies, then unfortunately you have to stop, find other alternatives. It would help if you take the product to your doctor and find out what it is that's making your skin irritated. So you don't waste any more money on products that don't agree with your skin.I would recommend Nioxin to anyone that suffers from thinning hair and hair loss, it really improves your hair condition with your personal great efforts too!Good Luck Guys,