Sam Chalmers, son of former Scotland and Lions fly-half Craig, has been banned from rugby for two years for doping.
The 19-year-old Melrose back apologised after admitting to using a pill called Pro-SD.
Chalmers, still a student, tested positive for methandienone and stanozolol while representing the Scotland U20 squad before the Test with Ireland in May, which serves as a warm-up to the Junior World Cup.
The pair of substances are both listed as anabolic androgenic steroids in the list of prohibited substances by the World Anti-Doping Authority.
"First of all I would like to apologise to my club Melrose RFC, my team-mates, the Scottish Rugby Union, my friends and my family," Chalmers said in a statement to the Daily Record.
"I am disappointed in myself and have to take personal responsibility for this incident which has ultimately led me to being banned from the game I have grown up with and love so much.
"I have been stupid, naive and impressionable and would urge other young players not to give in to the constant pressure to be bigger in the manner that I did over a two-week period in April last season.
"After my experience I would certainly encourage young players to seek out the correct advice from the right places before taking any kind of supplement or product.
"I hope over time I can be forgiven for my mistake and I can come back to compete in the game I love so much."