I can't imagine shaving your head and regularly treating it with betadine and saline before dermarolling for three months takes less effort than adding a daily protein shake to someone's diet. Dermarolling is also not pain free. So people suffering from hair loss absolutely have higher agency here.
You can’t just add a protein shake to someone’s diet and pretend that’s a meaningful measure. If the goal is to demonstrate that a higher protein diet is meaningful, then you need to pretty strictly track total protein (and probably total calories).
> So people suffering from hair loss absolutely have higher agency here.
That’s valid. Guys suffering hair loss are likely a lot more motivated than guys who opted into a protein study for $100 or whatever.
Most studies are actually done by having people just write down what they eat (or even just take a photo) in an app. This stuff is trivial. Applying a dermaroller and scalp products correctly at home is pretty complicated by comparison.
