What are the natural,none chemical hair products that will straight kinky hair for black women without heat? i?

i came across about 3 of them. i have not tried them. in reading the descriptions, it appears that you would need a flat iron to straighten the hair. i tried to find what is so great about them. it appears that they loosen the tangles and kinks. if you know about the products, please tell me. but most of all, is there a such thing as an all natural hair product that will straighten or make the curls looser without chemicals or heat?What are the natural,none chemical hair products that will straight kinky hair for black women without heat? i?
Yes, it is called Brazilian relaxer, which is actually very healthy for hair. Look it up on Amazon-