saj, I'm sure it's fine.

If you are wanting to see what it does, save some hair, from your brush, or from the beard (or try an inconspicuous spot), and mix a tiny bit of powder with some hot water, and do a "test strand". A tiny spot, to see what it does. It's often what we do before we commit to doing our entire heads (remember your head or beard is not a lab, so try it out first).

Good luck; it looks promising, from what I can tell.