What is the safe age for young people to use supplements? ADVERTISEMENT 2.55K viewsOctober 21, 2011 0 Gus0 October 21, 2011 0 Comments 12 Answers ActiveVotedNewestOldest 0 Scott0 Posted 0 Comments I believe 16 is an appropriate age for protein. Short of that, I don’t think anyone under 18 should use anything else except a good multi. Scott You are viewing 1 out of 12 answers, click here to view all answers. Register or Login