VITAMINS hair cosmetics Keratin Hair Serum with Biotin, Castor Oil & Collagen - Anti-Frizz Heat Protectant & Leave-In Shine Treatment for Dry, Damaged, Color-Treated Hair - 4.25 fl oz (125mL)

I’ve been genuinely impressed with this Keratin Serum. The formula feels lightweight and absorbs quickly without leaving my hair greasy or heavy, which is a huge plus. After using it consistently, my hair looks noticeably smoother, shinier, and much more manageable. It really helps tame frizz while adding softness and a healthy-looking finish. I also appreciate the ingredient blend — keratin, biotin, castor oil, and collagen — which makes it feel like a nourishing treatment rather than just a styling product. Another big benefit is that it’s alcohol-free, sulfate-free, and paraben-free, making it gentle enough for regular use. If you struggle with dry, dull, or damaged hair, this serum is definitely worth trying

I have very thick hair and it was getting dry as I age. It was also looking frizzy. I have been using this and my hair is so much softer. Although it doesn’t make the phrase go away completely, it definitely tames it. Would buy again.

Bought this for my wife she has only used it for a few weeks. Not only does this product smell amazing she alsoo said her hair feels and looks better than it has in years.

I liked this product better than expected. My hair is pretty straight, fine texture but frizzy. A little bit goes a long way but also did not leave my hair feeling greasy. I brushed my hair first (tried both damp hair and dry hair with same result), then added a pump of product to my hands and rubbed together then used my fingers to brush through my hair. I love the way this stuff smells! Hard to tell in pics: 1st pic - no product, 2nd - one side, 3rd - both sides, and back - you can see where I got the product on better one side than the other but it left my hair feeling soft, less frizzy and nice enough I didn’t do anything else to it. No straightening or anything. It also isn’t very heavy where my hair still had a little bit of a wave in it. I gave four stars because it’s a little difficult to distribute evenly but I highly recommend!

I have used this Brand for a few years. It doe not disappoint. I pair this with the Keratin Hair shampoo I have fine hair and this works wonders on it.

This is 3rd time purchase. Love the scent. Give a nice clean smell to hair. It leaves hair smooth. Does not feel greasy. Everyone comment how my hair smells good, when they give me a hug.

The best way to put it is I wash my hair everyday because I work in manufacturing, so it gets really humid and hot and I’m around a lot of chemicals, materials that have a type of dust in them, this product I use on the mids and ends, I’ve noticed my hair isn’t as frizzy or looks dehydrated and broken, it’s much softer. The downside of the size of the bottle, I wish it was a little bigger.

This is my 2nd time ordering it. It will smooth out frizzy hair make it soft and beautiful . You only need a little , buy this before its gone .