结论：根据此设有对照组的双盲试验研究结果表明，复合左旋肉碱能提高精子的活动度，尤其是对治疗前基数较低的病人更为有效。

• Conclusion( s): Combined treatment with L-carnitine and L-acetyl-carnitine in a controlled study of efficacy was effective in increasing sperm motility, especially in groups with lower baseline levels.