YouTuber Jamie Raines, a 22-year-old student, was turning 18 when he first started with testosterone, the hormone taken by transgender men. It is used to make their body, voice and entire appearance more masculine.

Testosterone is a hormone that is produced in the testicles and is fundamental to the advancement of male development and manly attributes. Aside from being a key part in the production of bulk, manly muscles, and solid, strong bones, it adds up to sex drive as well. Testosterone production tops during youthfulness and early adulthood.

Jamie thought of taking a selfie every day to document his transition.

Please click “KEEP READING” to see how much he’s changed.