My scalp itches without flaking. I wash my hair everyother day, and I have tried many many shampoos without much help. The anti-dandruff shampoos help the most, but they dry out my hair even when I use conditioner.
I didn’t have this problem when I lived in a desert climate - in fact, my dry skin issues increased once I moved to western Washington…which is odd, considering the wet climate.
I know scratching is bad, but its hard not to. rubs head
I’m using Bedhead moisturizing shampoo. I’ve only been using it for a week, but I seem to be less itchy.
I swear by the shampoo bars. Plus they smell yummy.
Your hair could be itchy because you may have somethinglike psoriasis. This actually mean sort of oily scabs, not dry scalp.
You can try something like a Nioxin shampoo, or Paul Mitchell makes a good Tea Tree shampoo that I like.
I’ve had this problem since I moved to Calgary, 16 years ago. I’ve tried about every shampoo under the sun, including stuff recommended by a dermatologist, and the only one that helped was Herbal Essences dandruff shampoo and dry scalp conditioner. I can no longer buy them here in Calgary - if you can find them where you are, try them, and send me an email so I can get you to supply me. 
They sounds great, I just ordered the Babassu & Marsh Mallow bars. 
My roommate would also love these.
Thank you! Thanks to everyone else too.
This may have absolutely nothing to do with your shampoo-related issues, but I use organic-type shampoos (some are “organic” and some are just detergent-free–effectively I’ll use anything that doesn’t use detergents like SLS) because the detergents in normal shampoos fry my hair and give me wretched itchy scalp. I have ass-length hair, and detergent based shampoos make it frizzy and cause it to mat. Not cool.
Two that I like: Avalon Organics and Giovanni 50/50. Just a thought 
Something else you might try (especially after using shampoo bars, which are basically soap and therefore can leave build-up) is a dilute apple cider vinegar rinse. I use a tablespoon of vinegar in four cups of water; the smell goes away after your hair dries. Wisdom from my great-grandmother. It can really help clear up minor scalp issues. Pour it over, let it sit a minute, then rinse briefly with fresh water.
I came to recommend this. Many dandruff poos have failed me but Tea Tree oil makes my scalp feel like it just ate a York Peppermint Patty. Use a generous amount so that it actually gets to your scalp, not just the hair.
Head and Shoulders Intensive Care.
I tried it at the recommendation of my Dermatologist. Good stuff.
Kinda bothersome, though with all the gorgeous women who just have to get in the shower with me, nowadays. Damn.
It’s almost as bad when I shave. Voluptuous chicks come out of nowhere to caress my cheeks, and uh…and uh…
The only shampoo I can use consistently is Nizoral. You can buy it in non-prescription strength at any store. It’s expensive so I rotate it next to Suave aloe and waterlily shampoo to keep the price down.