A thymus-gland preparation according to the invention contains polypeptides with a molecular mass of 600-6,000 Dalton and has the following composition, per cent by mass: polypeptides with an isoelectric point of 3.5-6.7 80-90 polypeptides with an isoelectric point of 7-9 and a molecular mass of 2,000- 4,000 Dt 20-10. A method for the production of the thymus-gland preparation according to the present invention comprises homogenation of thymus tissue, extraction of the resulting homogenizate with a 1-10% aqueous solution of acetic acid in the presence of zinc chloride for at least 24 hours, separation of the resulting extract into a precipitate and a supernatant liquid which is treated with an organic solvent, followed by isolation of the desired product.
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