I have 2a/b gray/white/leftover auburn hair, and it is the most porous hair ever. I have read hundreds of articles, tried dozens of products, own dozens of products... and it's been really hard figuring out why nothing works well. I have Keranique, Kenra, Living Proof, and Nexxus products. I use marula and jojoba oils for internal hydration and external sealing. I have castor/caffeine scalp oil. I have Hair Maxx products. I take saw palmetto and hydrolized collagen... ...and even with braiding, sealing, scalp massages, satin pillowcases, and air drying instead of heat drying, by the third day after washing my hair, it starts to look like straw. I have three pairs of high-quality shears, using one pair while the other is being sharpened, to trim split ends biweekly while I watch TV. All of this has led to my being able to have hair past my shoulder blades, but at what cost? After more reading, I bought this Olaplex 3 product, and I cannot believe the difference in the texture and moisture retention of my hair. I mean it. My hair has never felt like this. Its ... smooth. I dampen my hair, apply three teaspoons of the product, one after the other, as it absorbs, and then I put a grocery store produce bag on my head. Then I go about my day. A few hours later, I shower, rinsing the Olaplex 3 out, and then sparingly shampoo, condition, and post poo with Keranique and Living Proof products, finishing with the smallest amount of jojoba oil to seal. Then I wrap. The next day, my hair feels like it's not my hair. The softness isn't from product: it's from a hair shaft that has been sealed off and slides against the other hair. Every time I use this product, the result is better. I cannot stress enough that this product is a godsend for high porosity hair. As to price, one $30 bottle lasts me seven to nine washings, and my hair is 24 inches long (but thin). I have taken pictures of my hair now and will update in six months. It is worth the cost.