I’ve bought loads of hair treatments over the years for my dry, very fine and not much of it, hair. Best I’d found, by far, with Elasticizer.
And two weeks ago, I started using Olaplex. I bought 0 and 3 and have used them three times now. Fair feels really really soft and healthier. I haven’t used it enough to know whether it does build the bonds back in my hair, but I am impressed so far. Might buy the shampoo and conditioner too.