Pretty much what Tim said, after struggling for a few years (lost strength and muscle mass) started LCHF at the end of last summer , have my bloods under control and am now getting back up to my old max lifts and am regaining lean muscle mass..
Protein is the key to building muscle tho the amount needed is still constantly argued on forums around the world... I tend to stick to the lower end of the scale @ 1.4g of protein per kg of lean body mass, which works out at 135 gram @ 90kg lean body weight for me..
Lots of low carb protein powders out there, not strictly necessary but are convenient..
MyProtein diet is a good lowish carb choice price wise , I use half a serving to make a post workout smoothie using greek yogurt ,berries, peanut butter etc, works well