
Can a peptide reverse age-related immune decline? Thymalin and Thymogen are often discussed together, but one is a complex calf-thymus extract and the other is the defined dipeptide Glu-Trp. John Garrett explains thymic involution, T-cell biology, proposed mechanisms, the Russian clinical history, limitations of the human evidence, safety, and U.S. regulatory status. The science is interesting. The "immune rejuvenation" and life-extension claims remain unproven. Educational only. Not medical advice.
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