Jen's Story: Over the summer, I needed a boost for my long hair in the hot and humid air, so I picked up Redken Body Full Shampoo at my local Ulta store. They had a promotion going where they were selling it in armageddon-sized value packs so, needless to say, I still have half of it left. I was pleased with it at first, but my hair started getting more and more lackluster as time went on. I was months overdue for a hair cut and color (I know, bad beauty blogger!) and it showed.

I was traveling for work and forgot my shampoo and conditioner. Not wanting to subject my already damaged hair to the free shampoo in the hotel, I stopped by the Kiehl's booth at the airport and picked up Kiehl's Olive Fruit Oil Nourishing Shampoo. Normally I wouldn't buy any shampoo that purported to rehydrate or make my hair healthier...anything like that usually just weighs my hair down. But low and behold, my hair came to life! Was it just the dry Minnesota air? Nope, I was still in need of a hair cut, but my hair looked healthy even when I returned home.

So eventually, I did actually get that haircut. And once I did, the love affair I was having with the Kiehl's shampoo ended quickly. Suddenly, now that my hair was in better shape, it lost its oomph. How sad.

On a whim, I switched back to the Redken Body Full and it came back to life! Their claims of "volume, long-lasting style and shine" were once again totally dead on.

The moral of this story? Depending on when I reviewed each of these shampoos, I might have had a totally different opinion. It's important to take your needs into account when you buy a product, but just as important to re-evaluate your needs over time.

Kiehl's Olive Fruit Oil Nourishing Shampoo (if your hair is damaged)

Redken Body Full Shampoo (for fine, healthy hair)