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Updated: May 6, 2025
It may be a substance called spermin, but whatever the substance is, the physiologists agree that the testes form some substance which is absorbed by the blood and lymph, is carried to the brain and spinal cord and there produces these profound effects indicated above. So we have discovered the source of the stallion's strength and beauty. What is true of the horse is true of man.
Spermin was first discovered in the sperm by Schreiner in 1878; it has also been found in the thyroid, ovaries and various other glands. "Observations Upon the Acquirement of Secondary Sexual Characters, Indicating the Formation of an Internal Secretion by the Testicles," Proceedings Royal Society, vol. lxxiii, p. 49.
Many investigators in various countries have found that testicular extracts, and more especially the spermin as studied by Poehl, and by him regarded as a positive katalysator or accelerator of metabolic processes, exert a real influence in giving tone to the heart and other muscles, and in improving the metabolism of the tissues even when all influences of mental suggestion have been excluded.
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