Knowledge Content
#### 1. Positive regulation of muscle and metabolism
1. **Precise muscle growth and line shaping**: By activating the mTOR signaling pathway, it promotes the efficiency of myosin synthesis by 30%-40%, while inhibiting the decomposition of muscle by the ubiquitin proteasome system - this makes the muscle retention rate during fat loss 50% higher than the natural state. Its unique anti-aldosterone effect reduces water and sodium retention, and can make muscle contours sharper in 7-10 days, becoming the core driver of "thin lines" in competitive preparation.
2. **Indirect promotion of fat metabolism**: Although it does not directly burn fat, it accelerates the utilization of glycogen reserves by increasing the basal metabolic rate (about 5%-8%) and enhancing insulin sensitivity, indirectly assisting the fat loss process under calorie deficit.
#### 2. Potential damage to endocrine and organs
1. **Deep inhibition of hormone axis**: The negative feedback effect on the hypothalamus-pituitary-gonadal axis (HPG axis) is significant. After using 50 mg/day for 2 weeks, endogenous testosterone secretion in men decreased by 60%-70%, which may cause loss of libido and reduced sperm production; for women, due to interference with the ovarian axis, the risk of amenorrhea and hirsutism increases (the incidence is about 15%).
2. **Liver and cardiovascular burden**: The 17α-alkylated structure requires liver metabolism. Long-term use (>8 weeks) will cause ALT/AST to increase by 70%, and a few will develop cholestatic jaundice; at the same time, HDL ("good cholesterol") is reduced by 20%-30%, increasing the risk of arteriosclerosis.
#### 3. Differentiation of gender differences
Men are more susceptible to endocrine suppression, while women are more sensitive to androgens, and masculine characteristics (such as prominent Adam's apple and thicker voice) are more prominent than organ damage. Short-term low doses (<50 mg/day for men and <10 mg/day for women) can balance benefits and risks to a certain extent, but "side-effect-free use" does not exist - its effects on the body are always accompanied by cumulative doses, and some damage (such as hypogonadism) may be irreversible.
