So, this is really hard for me to answer:80% of the time, I'm a B2The rest I'm between a B4 and a B5.My calves twitch every day, but the rest of my body doesn't always twitch, it's much more random. My tongue seems to twitch once or twice, maybe once a week, so I struggle putting myself in the B5 category. Of course, there have been times where it's twitched much more than that, but it's rare. And, I notice it's usually related to how hard I'm clenching my teeth/jaw (TMJ).Not sure if this helps, Matt. Go ahead and put me in B5, if it means that you've twitched there - ever.Mitra