Canola oil does have a decent smoke point, but I'd never recommend it over ghee on LCHF, because ghee has a higher smoke point, better taste, fairly interesting nutritional properties, and more saturated fat.

Agreed on the supplements; I've been taking the ones I've been taking to hedge my bets, but I wouldn't advise anyone else to take any without a specific purpose (unless they really wanted to of their own accord).