Normally taken orally but some non-EU or US countries produce injectable versions. Its ability to increase muscle mass, harden the body and increase stamina has made it one of the go-to steroid choices for many a user – and it’s the one they use on racehorses to make them go faster. But many users report acne flare-ups and dry joints, and while it’s easy on the hairline, it’s hard on the liver. Warning signs of liver problems include abdominal pain, light-coloured stools, dark-coloured urine, unusual fatigue, nausea and yellowing of the skin or eyes. Brand names include Winstrol.