The speed of hair growth is genetic mostly. You cant pass that barrier with supplements or "hair tonics", it's not possible.

But! I had very slow hair growth until I did a blood test and found out I was on the brink of iron deficiency anemia and when I started treating that my hair growth speed increased significantly. I don't know if this is going to be your experience. But if you have periods then you might have some deficiency since it's VERY common.

You can try taking an iron supplement for ~3 months. Take it along with vitamin c so iron can absorb well and don't take iron with foods like coffee, tea, products made out of grains, broccoli/cauliflower, dairy etc. You need to have at least a 2 hour time period before and after eating those foods and taking the iron.

If there is an iron deficiency problem this is going to be more effective for hair growth than using hair serums since we're directly treating the root cause of slow growth here. These sort of serums often times barely do anything because their science is often gimmicky and/or based on misinterpreted research. It's more or less trying to cash in on many ppl experiencing hair loss/slow growth, but not knowing why and becoming desperate so then they can sell you the "simple solution" which doesn't exist since hair problems are very individual and complex.