Get blood work. Maybe your joints have other issues or maybe it is Low E, but no sense guessing if you don't have to. Maybe even try running no AI and see how it goes, depending on your history.
And yes, it will be fine to break open the capsule and divide the powder in two roughly equal sized piles. BTW, do not pull a Tony Montana and snort them, that would likely be no fun.

Anyhow, you can put one back in the capsule and take one with the raw powder or any combination. The raw powder may taste like the dogs dinner though, so be aware of that.