I wonder if it's considered a form of cannibalism to use the bones as a part of their diet. I've read enough of your stories to know that centaur aliens need a higher mineral diet because of their constant growing and shedding of antler bone. However could/would they be used for anything other than simply carving it into various objects or grinding it into powders for what I assume could be bone-white dyes and possible fertilizers. Many animals will do similar practices, like how some species will eat any placenta from the afterbirth of a pregnancy, but would bones ever be considered as a mineral supplement and have it be considered a normal thing?

It's not considered cannibalism any more than eating your own scabs is. Grinding shed antlers as a dietary supplement isn't uncommon but many cultures treat it as starvation food-- i.e., if you can't get enough magnesium from anywhere else, you're probably in a famine. Eating shed velvet also isn't that uncommon, but some folks might consider it "gross," like picking your nose. There are also a bunch of cultures that make artifacts and keepsakes out of antlers and velvet, which can dissuade eating them.

that makes sense but it felt like an interesting question to ask, especially after I saw that the most common way for a Centaur in space to find magnesium was magnesium chalk you'd see in workout gear when doing grip strength.

aahh the shape of centaur heads is so lovely and instantly recognizable... you've done such a great job designing and developing these guys