my friend just had a pretty serious allergic reaction to my chalk GSC Gym Chalk, no idea what triggered it in particular, but i thought that was really weird, especially since he's in the gym quite often. not a big chalk user himself, though.
Nick Goldsmith wrote: whatever is available but would like straight chalk with no additives as I use it for emergency heart burn treatment and I suspect the Petzl or metelious or whatever the stuff that I have is likely not good for me???? seems decent enough and doesn't taste horrible. I do like chunks mixed in with the powder.
Just reading this post, that’s the best protip i’ve ever read, I wish I had thought of that!