 And that's where every person's different. I think getting a baseline number. So if you do annual blood work, that's a really, really great opportunity to jump in and say, hey, can you also check my vitamin D? We do it in the office too. It's a blood spot. I started doing it in the office because I saw how much they were charging me for a vitamin D and realized that I could probably do it cheaper. And I can in the office. We just hand you over the vitamin D. You take it home. It's a quick, easy finger prick.