First, a little back story. My dad is awesome, and he listens. When I complained about my acne (back before I found my tea tree oil skin care regimen which works awesome for me), he saw an ad on TV for Proactiv. It sounds great, guaranteed to work, worked for all those people on TV, and also other people as well. So my dad being awesome as he is purchased it for me. I followed the instructions perfectly, used it for about a month only to end up looking like I didn't have skin, but a layer of boils on my face. Well, not really boils, but new pimples and lots of whiteheads. It was awful.
Moral of that story is that a product that claims will definitely work on your skin, work on your hair, remove your body hair permanently, really has a 90% chance that it will not do what it claims. Why, you may ask?
WE ARE NOT THE SAME, PEOPLE! We all have different skin, different allergies, different conditions, different hair, different hair growth, different everything. So before you go out and purchase a system that will make your problem "go away", request a trial. Go for something small before you buy the whole deal. Also, do your research. Google the product, there are some great customer (and doctor) reviews on the web. Even go see a doctor to find out what your allergies are and research the ingredients in the products. (Just a word to the wise: products that contain animal proteins tend to do more damage to the skin for some people)
Advertising is probably the most effective way to do business, but unfortunately for us lovely people who want to look even more lovely, the most harmful. When we have problems, we ache for solutions. When we see something on TV or the internet that worked for somebody, we want it too because we want our problem to go away like their problem went away. I will, however, not blame the advertiser. I will blame us, the ones who fall for it. Especially in this day and age where there is a wealth of information at our fingertips and also some amazing doctors who can assess what will and will not work for you with a few tests. Buyer beware.
Also, before you go out and buy a product, don't forget home remedies! There are some great home remedies out there that cost next to nothing and have proven to be very effective for SOME people. This goes for everything I listed above - hair care, skin care, and even hair removal by sugaring. What's great about them is that they're natural and have less of a chance of doing damage by synthetic ingredients your skin may have a reaction to.
One last tip: ALWAYS do a test patch. I recently had a really bad experience with wax strips where it somehow peeled off my skin and kindly left the hair behind. I really wish I did a test strip before I tried that out. Ouch.