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He frames it as triggering collagen production, repairing tissue, and helping regrow thinning hair (source)

Disease activity appears to correlate with the level of this marker

Metabolic improvements: Blood pressure, waist circumference, lipid profiles, and HbA1c all improved alongside weight reduction

Y. Wanget al., Thymosin 4 released from functionalized self-assembling peptide activates epicardium and enhances repair of infarcted myocardium, Ivyspring International Publisher, 2021. doi: 10.7150/thno.52309

Thus, GH exerts some of its effects by binding to receptors on target cells, where it activates the MAPK/ERK pathway