Something not often discussed is the depth at which one forces the needles down the scalp. It's an often left out information by those getting results. The amount of needles, the amount of passes and the amount of Minoxidil one applies is also valuable to know.
Success has been held by some through needling just once a week with a 1.5mm dermaroller but also by dermarolling with a 1.5mm dermaroller everyday. When needling once a week with a 1.5mm dermaroller it's more common that the needling is done heavily, with more passes and at a greater depth which draws blood. When needling everyday, regardless of needle length, focus is most commonly layed on just reddenning the skin.
There's plenty of evidence already that applying Minoxidil straight after needling is more effective. Minoxidil is put to more use with this method because of the increased absorption. However, more Minoxidil means more side effects such as an even greater amount of body hair being grown and lowered blood pressure. High doses of Minoxidil are easily held with oral pills and has the potential to promote extreme hair growth all over the body but might at the same time result dangerous.