A data, very important, is if at 4 or 6 years old, we have sebum in our scalp hair.
If yes, then time to start study again at this interesting problem.
Which is your opinion?
I dont want to send this thread off on a tangent about sebum but I will make one comment:
Did you see this study? I would have preferred them using balding mens sebum on some human area other than the scalp rather than animals.
https://sci-hub.tw/10.1001/archderm.1953.01540010005001