Research and experience suggest a first course of testosterone, with good training and food, can add several kilograms of lean mass and noticeable strength. Some early weight is water, and keeping the gains afterwards depends on recovery, training and diet.
- In a classic study, men on testosterone who lifted gained about 6 kg of fat-free mass in 10 weeks.
- Much of what is kept depends on training and eating after stopping.
- Social media physiques usually reflect years of training, genetics and often far more than a first course.
Expectations shape decisions. People who expect too much tend to add compounds and raise doses to chase a result that was never realistic. This guide uses research and honest experience to set expectations for a first experience with testosterone.
What the research shows
The best-known study is by Bhasin and colleagues, published in the New England Journal of Medicine in 1996. Healthy men were split into four groups for 10 weeks: placebo without exercise, testosterone without exercise, placebo with weight training, and testosterone with weight training. The testosterone dose was 600 mg a week, well above replacement.
| Group | Fat-free mass change | Bench press change |
|---|---|---|
| Placebo, no exercise | About 0 kg | About 0 kg |
| Testosterone, no exercise | About +3 kg | About +9 kg |
| Placebo, weight training | About +2 kg | About +10 kg |
| Testosterone, weight training | About +6 kg | About +22 kg |
Two lessons stand out. Testosterone works even without training, and it works far better with it. The participants were experienced lifters eating a controlled diet with adequate protein.
What happens week by week
- First two to three weeks: long esters are still building up. Little visible change; some people notice better mood, libido and recovery.
- Weeks four to eight: strength rises, weight increases, muscles look fuller. Some of this is water and glycogen.
- Later weeks: steady gains if training and food stay consistent; the pace usually slows.
- After stopping: water and some glycogen leave; strength may dip, especially during the low-testosterone period before natural production recovers.
What you keep
Muscle built while using testosterone can largely be kept if training continues and calories and protein stay adequate. Water weight is not kept. The period after stopping is where many people lose the most, because low testosterone, fatigue and low motivation cut training quality. Planning recovery, with medical help if needed, matters as much as the course itself. See our Nolvadex guide and preserving muscle.
Why social media misleads
- Many physiques shown online reflect a decade of training, favourable genetics, low body fat and lighting.
- Some use far more compounds and higher amounts than they disclose.
- Photos are often taken at a peak, pumped and dehydrated.
Comparing your first course with those images leads to frustration and riskier choices.
The factors that matter most
- Training: progressive overload on compound lifts.
- Protein and calories: about 1.6–2.2 g of protein per kilogram a day, with a modest surplus to gain.
- Sleep: seven to nine hours.
- Training age: people with a few years of serious training tend to see the clearest results; complete beginners can grow without any compounds.
- Consistency across the whole course and afterwards.
Side effects are part of the results
Results also include changes you did not want: lower HDL, higher hematocrit, acne, possible breast tenderness, suppressed natural testosterone and sperm production. Bloodwork before, during and after shows the full picture. See our bloodwork guide.
How to measure progress properly
Daily weight swings of one to two kilograms are normal from water, salt and food in the gut, so single readings mislead. A better system:
- Weigh every morning after the bathroom and track the weekly average.
- Measure your waist at the navel weekly; if weight rises and the waist barely changes, most of the gain is lean.
- Log the weights and reps on three or four main lifts.
- Take photos every two weeks in the same light, time and pose.
- Get bloodwork to confirm your testosterone levels are where you expect.
Together these show real change far more clearly than the mirror.
Common mistakes
- Judging progress daily rather than by weekly averages, photos and lifts
- Adding compounds or raising amounts when early weeks feel slow (long esters need time)
- Eating in a large surplus and gaining mostly fat
- Stopping training during the low period after the course
- Skipping bloodwork
For planning, see a first testosterone course and the conservative approach.
Frequently asked questions
How much muscle can you gain on a first cycle?
Research and experience suggest several kilograms of lean mass with good training and diet, though some early weight is water.
Do you lose gains after stopping?
Water weight is lost. Muscle can largely be kept with continued training, enough protein and a well-managed recovery period.
When do results start?
With long esters, most people notice changes from about the fourth week, once blood levels have built up.
Photo: Scott Webb, StockSnap (public domain).
General information, not medical advice. Anabolic steroids are Schedule IV controlled substances in Canada.
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