Let's put this question to the rest.

Disclaimer first : as the title at the start of this forum says - all health advice here is not to be taken as medical advice, so though I am a current practicing medical officer, I am to be just considered as voicing my own "opinion".

Minoxidil is the only proven scientific method for hair growth. It only continues growing as long as you apply it. Once you stop, it will shed slowly.

Treat it as a recurring expense. It's like hypertensive, diabetic, gout, oral contraceptives, hormone replacement tablets - as soon as you stop them, their effects will wane and disappear.

It's like turning off the aircond in your room/car. Pretty soon it is gonna get hot again.