Hair Growth Remedies

I am currently taken biotin supplements (pills) to help increase my hair growth. But I have started noticing that in a lot of shampoos, conditioners, and other beauty products that claim to increase hair growth, biotin is a major ingredient. So I wanted to know if i could use liquid biotin supplements directly on my scalp to possibly increase hair growth. Thanks!

I lost the hair on the top of my hair due to radiation and I was wondering if there are any special treatments I can do to promote the hair growth.
Should I wash my hair more or less? Right now I have some dry scalp so I use an all natural itching/dandruff shampoo that has been helping. Also, I wash my head twice a week and use a soft bristle brush to remove the dead skin and stimulate blood flow to my scalp.
Any recommendations?