What does it mean natural? That is produced by nature? So then has to be better? Snake poison is produced by nature...
If it is a vasodilator like minoxidil what are you looking for is because it contains molecules that act minoxidil. Probably because they have similar or close chemical...
Is difficult to set such causality. But I think that is clear that micronedelling causes wounding repair, which is carried out through a lot of cellular mechanisms which involve molecular pathways (WNT, etc.) which are in somehow related to tumours. However, we don't even understand clearly how...