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The evidence for peptide injections improving muscle mass and function is limited and varies significantly by peptide type
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Within experimental models, it is commonly investigated for peptide-mediated signalling dynamics and molecular interaction mechanisms
revealed that Leydig cells have demonstrated the presence of phosphodiesterase type 5 (PDE5), indicating that PDE5 inhibitors (PDE5-Is) might play a role in enhancing testosterone secretion and steroidogenic pathways [111]
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