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**Initial Signs** typically appear 48-72 hours after injection. Users will initially experience an increase in energy-an 8%-10% increase in resting energy metabolism, accompanied by an approximately 15% increase in endurance during training-a direct response to the rapid influx of free testosterone into the bloodstream. However, changes in muscle mass are not noticeable during this period, and approximately 60% of the weight gain is actually temporary water and sodium retention.https://www.fiercerawsource.com/steroid-finished/steroid-finished-oils/stromusc-brand-100mg-ml-testosterone.html
**Substantial Changes** occur in weeks 2-4. With an injection frequency of three times per week (a total of 100-150mg), protein synthesis efficiency increases by 25%, and measurable increases in size (approximately 0.5-1cm) begin to appear in areas like the pectoral and deltoid muscles. A 2024 study in Clinical Endocrinology showed that strength gains are even more significant during this phase: the average maximum squat weight increases by 6-8kg, and the reaction speed of young men (25-35 years old) is 30% faster than that of middle-aged and elderly men.
**Individual differences** are key to breaking the "time standard answer." Those with a body fat percentage below 15% experience a one- to two-week reduction in the onset of effect due to increased hormone receptor sensitivity. Those with insulin resistance may experience delayed muscle growth until the sixth week, even with the same dose. Injection site also influences pacing-injection into the quadriceps is absorbed 12% faster than into the buttocks, bringing peak efficacy one day earlier.
Experts emphasize that "the advantage of testosterone propionate lies in 'controllability,' not 'speed.'" Its short-acting nature allows users to quickly adjust their response by adjusting the dosage. Blindly pursuing "one-week results" can lead to endocrine disruption. Usually after 6-8 weeks of standardized use, 70% of users can achieve stable muscle growth and physical fitness improvement, which is the result of a dynamic balance between hormones and the body.
