best hair product for volume and preventing dandruff?

ice cream keratin image

H3@Th3R

I eat a lot of vegetables, fruits, etc and do tons of exercise(diabetic so have to) I dnt eat junk food at all but anyways ever since i became diabetic my hair is really thin now, its not so crazy it just a lil wavy but I want it to be with more volume, I barely get split ends but I still wonder what a good product for my hair will be. I had dried dove but it gave me dandruff to get rid of it I tried bio-lace,keratin, johnson which made it worse, head-n-shoulders which got the itch off but not dandruff, selsun blue works amazing but I don't think it makes promotes volume. My friends recommend suave, pantene etc but idk and I searched for many and so far most use these
Bumble and Bumble Thickening Serum

Motions CPR Protein Reconstructor

Roots of Nature Healing Thickening Cream

Aussie Catch the Wave Sprunch Hair Spray

Pantene Pro-V Ice Shine 2 in 1 Shampoo + Conditioner
my hair is long (not long long)
dark-brown and wavy thin
my african-american friend cut her hair to her shoulders n put it ina bun and it was so big while mines in a bun was super small

Answer
Any aussie or herbal essences shampoo combined with selsun should work fairly well, but dandruff, is nearly uncureable. I found some tar like shampoo at walmart and that worked O.K.