My boys sister jacked up her hairline fukking with microbraids and used this.
Far as I could tell, it only made her hair jet black.
Hair was dark as all hell and was a great look, but I don't think it did much for her hairline.
She claims it did and used it for months, and her hair has began filling in at those spots so I just took her word.
All evidence is anecdotal and nothing is concrete, but you can find the stuff cheap.
I think if your hair loss is due to genetics you may be SOL.
Perhaps if the hair loss was due to you damaging your hairline yourself, it could possibly work.
I never heard anyone claiming success with this stuff that didn't use it daily and for months, though by then, your hairline could have restored itself barring the issue wasn't genetic.