Not generally in casual conversation, and certainly not in a medicine-adjacent/overlapping subject matter where it creates substantial confusion as to a person'

Not generally in casual conversation, and certainly not in a medicine-adjacent/overlapping subject matter where it creates substantial confusion as to a person's authoritative clinical capacities. This is an ongoing game played by "doctors" of chiropractic misleading the American public to perceive them as equivalent to M.D. Doctors. It's a cheap way to gain clout, but an M.D. is a professional doctorate, a PhD is not, the distinction matters here. Beware of non-M.D.'s insisting on a Dr. prefix, or folks citing these people as such especially when it serves to bolster their medicine/health/nutrition claims. It at least suggests a desperation for authority. Huberman's at best prefixed as Professor here IMO. Even that's being generous since he's an associate professor according to his wikipedia page.