This invention relates to the food industry and, in particular, to a technology of making an extract of a biologically active additive intended for wide application, and may be used as a biologically active food additive in pharmacology and the food industry. According to this invention, a method of making an extract of a biologically active additive consists in that second and third sort young reindeer antlers with their pelage for a length of 10-12 cm from the ends are taken, cleaned from dirt and washed with an alcohol solution, dried at 10-12.degree. C. until their humidity is app. 30% (for 35 hours), the obtained raw material is ground down to a fraction of 3.7-4.69 microns, then the obtained powder is extracted with 50% ethyl alcohol at 17-25.degree. C. for 15-27 hours under periodic mixing of the solution, after settling the precipitate is removed and once again extracted in a new solution of 50% ethyl alcohol at the same conditions, this process being repeated at least three times for the purpose of obtaining a first, second and third semi-finished extract according to the extraction stages, then the obtained semi-finished extracts are mixed together, ethanol and acetic acid are added for the purpose of obtaining 50% strength and pH=4.3-5.1, then the semi-finished extract is held at T=-49.degree. C. (or 47-51.degree. C.) for 8 hours, then it is filtered at 0-5.degree. C. for obtaining the finished product in the form of an extract of a biologically active additive.