Wikipedia
Actovegin is a highly filtered extract obtained from calf blood which enhances aerobic oxidation in mammals. This improves absorption of glucose and oxygen uptake in tissue, which may enhance physical performance and stamina.
Actovegin made headlines from 2009 to 2011 when Canadian sports doctor Anthony Galea was charged with illegally providing professional athletes with a number of performance-enhancing drugs, including Actovegin. As revealed by later testimony by riders, it was also regularly used by Lance Armstrong and the members of his U.S. Postal Service Pro Cycling Team on the 2000 Tour de France to enhance their performance. Recent study has proven that Actovegin does not improve human peak performance. Actovegin can be useful to treat muscle injuries.