Fig. 9.
Disposition of caffeine in the sebum layer when hair follicles are open; (a) t = 5 min; (b) t = 20 min; (c) t = 1 h; (d) t = 10 h.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.