Skin and hair improvements after 4 months

Not the reason I started, but a welcome surprise. Around month 3 my wife pointed out my skin looked better, and I do think it's a little firmer and more hydrated looking. My hair feels a bit thicker too, though that's harder to judge.

I know GH plays a role in collagen and skin, so it's plausible rather than just placebo. Anyone else notice changes here? Trying to figure out what's real versus wishful thinking.