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For example, transdermal microneedles loaded with allopurinol bypass hepatic metabolism, reducing first-pass effects and enabling sustained release (Wang et al., 2025)

Both Type I collagen (structural support) and Type III collagen (flexibility and early-stage repair) went up

Insulin binds to the insulin receptor and activates the PI3K/Akt pathway, which plays a key role in promoting spermatogenesis and the metabolism of testicular cells [158, 159]

(ed.), 2010

Both are worth knowing before you read anything else on the subject

Fifthly, the self-renewal of NCs occurs infrequently and is not unlimited, aspects that oppose the stem/progenitor cell function [58]