The traditional hair growth solutions have commonly been referred to as the big 3. These are the most well known ingredients which grow hair.
Developed in the 90's, minoxidil is an anti-hypertensive agent which grows hair by improving blood flow to your scalp, which increases nutrients that your hair receives.
Finasteride is a highly effective DHT blocker. In clinical studies, it blocks up to 80% of DHT that reaches your scalp.
Ketoconazole is an anti-fungal agent which has been shown to improve hair shaft width and also improve the amount of hairs in the growth phase.
It is important to recognize that even if you use the big 3, there is more you can do to improve your hair growth†. Check out the Spark 6.