Does GrowTaller4Idiots actually work, or is it just a scam?

Unfortunately, no it doesn't... I'm sure you may not want to hear this, but the only thing that will work safely and naturally is time. Nothing can force your body to grow taller than your DNA says you will and time is all it takes to make that growth happen.

There are some things that can take away from your potential height (eg. coffee/caffeine, smoking, drugs, etc), so as long as you stay away from those, exercise at least on a semi-regular basis, and have a healthy diet, you should grow as tall as you're supposed to. Besides all that,

 your growing age normally peaks around 20 years old, so since you're younger than that, you've got time to finish growing and any HGH pills (or other "artificial growth" products) can actually be detrimental to your height and/or health.

The only thing that actually would work aside from that would be a risky, expensive, and very painful surgery where they break your leg (no joke) in strategic places, space them apart, then let your body heal. It's most common in China where height has a bigger impact in certain jobs

. Over the course of a year or two, they could add a couple inches or so to your leg... but I don't think it would be worth the pain and price myself.


However, there are insoles that will help to boost your height because they are adding the height, not making you grow taller.
Good luck and I hope I helped!

Source:
Health/nutrition classes and personal research in my role as a Product Specialist for a vitamin company