Nowadays, the hair aisle in the drug store is overwhelming. The shelves are bursting with so many different shampoo options, each one promising something different than the next. Still, nothing really delivers as we'd hope, and what's worse is that each one only targets one hair concern when so many of us have several.

Fortunately, beauty brand Function of Beauty creates personalized hair care for all your needs. The company is the first of its kind in offering fully customizable bottles of shampoo, each free of sulfates, parabens, toxic chemicals and animal cruelty. The personalization happens based on a quiz that asks you about your hair goals. The results are sent right to your doorstep in pretty packaging that can't be found at the store. But more importantly, Function of Beauty provides safe and clean shampoo, which is hard to come by on store shelves. Here are five reasons you should never use drugstore shampoo again.

1. It's full of paraben, sulfates and other nasty chemicals.

Methylparaben, polyethylene glycols, and formaldehyde are just a few of the potentially harmful ingredients found in popular store-bought shampoos. Function of Beauty has no parabens, sulfates, or toxins, but instead is just filled with the good stuff that will make your hair healthy and shiny. Even better, it's vegan so you know the shampoo you're using doesn't contain any animal product

2. Unlike most drugstore brands, Function of Beauty does NOT test on animals

It is illegal to sell products in China without testing on animals. Therefore, all of the large beauty companies have had to make a deal with the devil to sell there - Unilever (TRESemme, Suave, Dove, Nexxus, Axe, APOTHEcare, Love Beauty & Planet), P&G (Pantene, Herbal Essences, Head & Shoulders, Aussie, Old Spice), L'Oreal (L'Oreal Advanced, L'Oreal Ever, L'Oreal Elvive, Garnier Fructis, Garnier Whole Blends), and J&J (OGX) which control over 80% of the US hair market are all unable to say they don't test on animals. Therefore, buying in a drug store almost certainly means consumers are buying from a company that tests on animals. Function of Beauty is 100% cruelty free - for a hair care company, this is really hard to obtain so it's great to know you're using one of the only humane hair care products available,

3. Hair isn't "one size fits all."

Shampoo, like most beauty products, should be personalized and catered to your specific needs. Each bottle of Function of Beauty product is individually filled and customized with your hair needs, scent and color preference, and your name stamped right on the bottle. For example, if you note your hair concern as being frizzy, Function of Beauty will add x and pair this with y if you also mark thermal protection as one of your hair goals. This means that no formula is ever the same. Just like a prescribed medication from your doctor, Function of Beauty tailors their formulas to your exact hair needs.

4. It's all in the name.

Most shampoo companies are all about the label instead of what's inside. That's

why we're usually just paying for a big brand name rather than ingredients that actually work. Unlike these brands, Function of Beauty is all about what goes into the bottle, rather than what's on the exterior (mind you the bottle is gorgeous as well) to ensure you're hair is getting the exact care it needs.

5. The scent and color aren't real.

How many times have you found a shampoo that you liked, but refused to use it because it smelt vulgar? Unlike other shampoos, Function of Beauty gives you the opportunity to select your scent. Some of Function's fragrances include 'feeling (f)ineapple', all (you) calyptus, and (fl)ower to the people. You can also choose the strength of this scent whether you're after something subtle, or you love getting full-blown whiffs of that fresh floral scent days after your wash.

There's only one way to make a real change in your hair's health, and it won't happen with using the same old harmful products found in drugstore shampoo and conditioner. With Function of Beauty, you can change the look and feel of your hair — safely and 100% personalized for you!

UPDATE: Function Of Beauty is giving Popdust readers 20% off their first order. Click here and start the hair profile quiz!