Help for frizzy hair

I have long hair that only has a color to cover gray. My hair is wavy and gets frizzy, even after I blow-dry over a round brush.

Could anyone suggest some products that would help de-frizz?

Should I use a deep conditioner that will help improve the condition of my hair?

Thanks for any suggestions!

Thanks, Sirenity!! I'll check that out.

I just bought some Phyto Defrisant and used it for the first time this week. I've read some great reviews of it for straightening and de-frizzing. It's supposed to improve your hair's condition the longer you use it.

As I say, I've only used it once but it seemed to work pretty well. My hair is definitely less frizzy, though I still have a little (I hope that'll improve with use), and it's not at all heavy on the hair. I have pretty long hair and I used a quarter-size dollop and it didn't weigh my hair down or make it sticky or stiff. It's day 3 and my hair is still about the same as the first day I styled it.

So far, this is the best product I've tried, but I'll check out the L'anza.

Thank you!

I think Hairboutique.com sells the phyto products