i just checked out their website and there's no physical address for this brand, only a 800 number. i also checked out mars botanical and they only have a po box.
This is Mars, like the Mars candy company - it's a division of THAT Mars. So in other words legit. I've researched this product and the website in the past.
On another note, I had trouble with the code at first. I had to enter the code in the coupon code box and then press enter on the keyboard before it would take it. Hopefully this works out - thanks op!