Minoxidil works by improving blood flow to the area in which it’s applied. Apply it to your scalp and it can potentially improve the supply of blood and nutrients to hair follicles, improving hair density and increasing the rate of growth.
As such, there’s no reason minoxidil shouldn’t work for a receding hairline. The hair follicles in your hairline aren’t significantly different from the others on your scalp or crown, meaning that you should still experience the benefits of minoxidil when you apply it to your hairline.
There are also countless anecdotal cases of people with receding hairlines improving growth and increasing thickness by using minoxidil.
However, right now there isn’t any detailed scientific research on the effects of minoxidil on the hairline. As such, it’s best to view minoxidil as something with potential benefits, instead of as a guaranteed way to regrow your hairline.
It’s also worth considering minoxidil in combination with a DHT blocker like finasteride. Studies show that minoxidil and finasteride can have a synergistic effect in preventing hair loss, making the two medications a popular combo for protecting your hairline and scalp from baldness.