This is to help existing hair and has nothing to do with male pattern baldness, save for keeping your scalp healthier. I used to use Pantene,brands from costco, etc. I also used to not wash everyday, sometimes 3/4 days(even though I was oily type) ,and can feel dandruff build up and used to get it chronically. I have since decided to wash my hair with shampoo when it feels dirty and wash my hair with conditioner on days it does not. I don't skip days washing my hair much anymore. I no longer get dandruff(although I did use Regenpure DR) for 6 months.
My hair was thick but used to be dry/frizzy. Even though I remember my hair was thick and sleek since young, like most Asians, my hair got thinner and frizzier. I had good/bad days, but have since found out, you want to prevent damage of the cuticle as the hair is growing. Your texture(thick/thin, wavy/straight is all genetic), but what you don't want to do, is damage the cuticle while it's growing out.
I've noticed better quality hair, less frizz, since I have done these things below, besides, taking fish oil, iron, zinc,vitamin d supplements.
1. Use non harsh shampoo. I use Giovanni shampoo/conditioner and prefer their newer line. The bottle is different.
Here is one version of their newer line:
https://www.amazon.com/Giovanni-Repair-Shampoo-Blackberry-Coconut/dp/B00RY22O10/ref=sr_1_8_s_it?s=beauty&ie=UTF8&qid=1533042980&sr=1-8&keywords=giovanni+shampoo&th=1
2. I've read up about pro/con of air dry/blow dry. What I've always noticed is when I blow dry my hair, it's less frizzy as opposed to letting it air dry. I used cool setting so it doesn't damage the hair. Ever since, even when I let it air dry, my hair is less frizzy. Seems to work for me as it seals the cuticle.
However, ever since I started using HSI PROFESSIONAL Argan Oil Heat Protector my hair has been less frizzy and seems healthier (oils help lubricate). I'd recommend this product.
This is just my experience and works for me. Others may have different experience and opinions.