I'd like to second hot girl's mention of redken. I have really, really thin blonde hair (like, you can see quite a lot of scalp), and I use Redken Body Full shampoo and conditioner and my hair looks awesome and thick and bouncy. Makes me happy about my hair. When I wash my hair and want it looking thick if I go out that night, I leave my hair in a ponytail throughout the day after I wash it (and it's still wet). I find this makes my hair a lot thicker too. Leaving your hair in overnight has a similar effect, but I wouldn't suggest it as it can lead to breakage. Head massages not only feel good but also really work in making more hair grow. It's all about circulation. Exercise helps a lot too (in terms of circulation), as does a diet with enough iron (meats, etc) and leafy vegetables. I'm not a big fan of lettuce on its own, but I get my daily dose of it in wraps, and I love chicken wraps (chicken has protein; also good for hair growth). Also, when you shampoo, spend time massaging it into your roots as this help stimulate hair growth. But when you massage, use the pads of your fingers, not your nails, as nails can rip your hair out. And before you put the conditioner in, squeeze the excess water out from your hair. This helps your hair absorb the conditioner easier. Leave it in for a few minutes, don't wash it out straight away. I put emu oil in my hair overnight some nights as that's supposed to make your hair stronger, healthier, thicker and more of it. I tend to do this on nights when it's just me at home alone, as it looks pretty greasy. Then I just wash it out in the morning. Try not to straighten or blow dry your hair too often, as this will definitely thin your hair out. Hair straighteners remove nearly all the moisture from your hair, which equals 'snap'. Wearing product too often clogs your hair follicles and stops hair from growing. Make sure your hair has enough moisture, too. I use a Redken Clear Moisture hair mask twice a week. I especially recommend it if you do straighten your hair often. Don't use it too much necessary; it can weigh your hair down a lot. Lastly, avoid really long, unlayered hair. Layers are your friend, and shoulder to medium length hair means it isn't weighed down. Hope this helped!