Some people want to buy Redken products, but they simply cannot afford to. They might not have much money, or they might have their money budgeted for other things that are more important to them.
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Other people feel that hair care products are all the same and there really isn't any reason to buy something that costs more than something else. Everyone is certainly entitled to his or her opinion. For the people who feel that higher priced products are superior to lower priced ones and that Redken is an excellent brand, paying a bit more for their hair care products usually isn't a problem. This is especially true of people who spend a lot of time in the salon having things done to their hair, because this can damage their hair and make it harder to take care of. If you chemically alter your hair often, you might want to consider Redken products. This is true if you color your hair, or if you perm it, straighten it, use metallic dyes or highlights, or whatever else you might do to it.
All of those things are hard on your hair, and you have to make sure that you put back the nutrients you're taking out by causing this damage. The best way to do that is with high quality products like Redken and other similar brands. You might pay a little more for them, but you can find good deals in many places. If you look around at reputable places, especially Websites for beauty supply, you can get these products for less money than you would expect. This lets you use the products you want, get them at a great price, and take care of your hair. If you've invested a lot in getting it to look the way it does, you'll want to take good care of it.