Are straightening gels and conditioners safe for damaged hair?

I've been looking for a new way to do my thick, curly hair without damaging it. I saw several products at the store today, but it was quite overwhelming trying to pick something. My questions:

Do straightening gels work without heating appliances?

Do straightening conditioners/gels work very well?

Will the chemicals in the straighteners damage my hair?

What I'm particularly worried about is damaging my hair. One product I saw was by Sexyhair, a relaxing conditioner. Any suggestions of products that work? While I'm getting used to it curly now, I'm just looking for an occasional change. I am really clueless about hair products, etc. so I really appreciate the help!

Are straightening gels and conditioners safe for damaged hair?

No, These Products Will Not Damage Your Hair. In Fact, They May Help Improve It's Condition. They're Basically Just A Type Of Styling Gel Or Creme.

Are straightening gels and conditioners safe for damaged hair?

nope.

it'll make it worst cos it's all chemical..

Are straightening gels and conditioners safe for damaged hair?

for sure..

ive observed my cousin who uses gel everyday..

and u know what? he started to bald..