NADH showing more consistent results than NMN/NR for energy and cognition - what gives?

Hey everyone, I've been looking into NAD+ boosters lately to try and get more energy and mental clarity. There's so much hype around NMN and NR, but the studies seem really mixed. I came across some older research on NADH that actually looks more promising. The results for fatigue and brain function are way more consistent. Someone mentioned CD38 breaking down NMN/NR before it can get into cells. Maybe that's why the results are all over the place? NADH is already in the right form, so it might work better. I'm wondering if we're just focusing on NMN/NR because they're easier to produce. NADH used to have stability issues, but there might be better formulations now. Has anyone seen studies directly comparing these? It's hard to tell what works best when they all measure different things. Really hoping to find something that gives me a reliable boost. Let me know if you've had good results with any of these!