In sports, “juicing” means using performance-enhancing drugs, most commonly anabolic steroids. When someone says an athlete is “juicing” or “on the juice,” they’re claiming that person is artificially boosting their strength, speed, or recovery through banned substances. The term is informal but widely understood across nearly every sport, from baseball to track and field to bodybuilding.
What Counts as “Juicing”
The substances involved go beyond just steroids, though steroids are the most common association. Juicing can refer to anabolic androgenic steroids (AAS), human growth hormone (HGH), erythropoietin (EPO, which boosts red blood cell production for endurance), and other compounds on the World Anti-Doping Agency’s prohibited list. WADA’s banned category for anabolic agents alone includes dozens of specific chemicals, from well-known names like testosterone and boldenone to designer steroids created specifically to dodge testing.
Other slang terms overlap with “juicing.” You’ll hear “on the roids,” “on gear,” or “doping” used interchangeably depending on the sport and the circle. In baseball, where the term became especially popular during the steroid era of the late 1990s and 2000s, “juiced” became shorthand for any player whose sudden physical transformation raised suspicion.
How These Substances Work
Anabolic steroids are synthetic versions of testosterone. When they enter the body, they bind to receptors on muscle cells and trigger those cells to ramp up protein production. This is the core mechanism: more protein synthesis means faster muscle growth and quicker recovery from training. At the same time, steroids reduce muscle breakdown, so the body builds tissue faster than it loses it. The net effect is that an athlete can train harder, recover quicker, and put on muscle mass that would be difficult or impossible to achieve naturally.
Steroids also activate satellite cells, which are essentially repair cells for muscle tissue. This means not only do muscles grow larger, but damaged fibers get rebuilt more efficiently after intense workouts. For an athlete, this translates to being able to handle training volumes that would leave a natural athlete overtrained and injured.
How Athletes Use Them
Steroids are taken as pills, injected as oil or water-based solutions, or rubbed on as creams. Injection and oral use are the most common routes in sports.
Athletes rarely take a single substance at a steady dose. Instead, they follow structured protocols with their own vocabulary:
- Cycling: Using steroids for a set period (typically 6 to 16 weeks), then going off for a similar length of time before starting again.
- Stacking: Combining multiple substances at once to maximize results, mixing and matching different steroids or pairing them with growth hormone.
- Blasting and cruising: A newer approach where the athlete uses a high dose for 6 to 12 weeks (the “blast”), then drops to a lower maintenance dose (the “cruise”) instead of stopping completely.
The goal of cycling and blasting is partly to manage side effects and partly to try to beat drug tests by timing use around competition schedules.
Physical Health Risks
The performance gains come with serious costs. Long-term use of steroids at the doses athletes typically take can cause irreversible cardiovascular damage, including thickening of the heart muscle, high blood pressure, dangerous changes in cholesterol levels, and increased risk of heart attack. Oral steroids in particular are linked to liver damage, including rare but severe outcomes like liver tumors and spontaneous liver rupture.
One of the most significant effects happens to the body’s own hormone system. When you flood the body with synthetic testosterone, it stops producing its own. After a steroid cycle ends, male users often experience a temporary state of extremely low testosterone, which can cause fatigue, loss of muscle, sexual dysfunction, and depression. In some cases, the body’s natural production never fully recovers, leading to long-term infertility.
Effects Specific to Women
Female athletes face a distinct set of risks. Because women’s bodies naturally produce far less testosterone, introducing synthetic androgens causes masculinizing changes that are often permanent. The most frequently reported effects include facial and body hair growth, male-pattern hair loss, deepening of the voice, menstrual disruption, and clitoral enlargement. Voice changes can occur even at relatively low doses, and research has shown that vocal pitch drops measurably even before the athlete notices it herself. Severe cases have included liver rupture, multi-organ failure, and sudden death.
Mental and Emotional Effects
“Roid rage” is the pop culture term, but the psychological effects are more complex than sudden outbursts of anger. Steroid use is associated with irritability, mood swings, hostility, forgetfulness, and confusion. In studies comparing bodybuilders who use steroids to those who don’t, steroid users score significantly higher on standardized measures of both depression and anxiety. None of the non-users in one study showed clinical depression or anxiety, while multiple steroid users displayed mild to moderate symptoms of both.
The mental health risks don’t end when the drugs stop. Withdrawal from steroids can trigger major depressive episodes, particularly in the first few months after quitting. There’s also a pattern of broader substance misuse: steroid users are more likely to use cannabis, cocaine, and alcohol compared to non-users, compounding the psychological toll.
How Athletes Get Caught
Anti-doping agencies test athletes through urine and blood samples, both during competitions and unannounced at training facilities. Detection windows vary widely depending on the substance. Some injectable steroids leave traces for months, while certain peptide hormones like insulin are only detectable for 6 to 12 hours after injection. This gap between long-acting and short-acting substances is exactly what athletes try to exploit when timing their cycles.
WADA and national agencies continuously update their testing methods. Samples can be stored for up to 10 years and retested as detection technology improves, which is why some athletes lose medals years after competing. The biological passport system also tracks an athlete’s blood values over time, flagging suspicious changes even when no specific substance is detected.
Why the Term Sticks Around
Juicing remains one of the most recognizable slang terms in sports because steroid use has touched virtually every major league and Olympic discipline. From baseball’s home run controversies to cycling’s EPO scandals to track and field’s ongoing suspensions, the word carries an instant connotation of cheating and unfair advantage. When fans or commentators say someone “looks juiced,” they’re making a judgment based on rapid physical changes, sudden performance jumps, or both. Whether that judgment is fair in any given case is a separate question, but the term itself has become a permanent part of how people talk about the intersection of drugs and competition.