Yes it's legal in most places as it's from the stems not the bud kind of like hemp flower is legal.
I have taken it but it's £54 for a bottle that last 7 days if I take it as I'm meant to and unfortunately I do not have that amount of money
Are you in the UK if so check out the 'love CBD' website they are great and will take a full medical history either online or over the phone they even posted mine out next day delivery for free as it was Xmas and I had forgot to order it.