7% Ectoin Booster.

"Paula's Choice 7% Ectoin Booster may help your skin to defend against environmental aggressors, which ultimately do compromise barrier integrity. It's particularly suitable for people who have very sensitive, redness-prone skin or skin where the barrier is impaired, but also good for general moisturizing purposes. [...] My all-time favorite ectoin product is Paula's Choice Ectoin Booster, which contains a whopping 7%. [...] The [Paula's Choice] product is significantly richer and much more emollient, much more occlusive in comparison to other ectoin products I've tried."

"Ectoin is an extremely light antioxidant and skin hydrator. It's a trendy ingredient, but I have to admit, I am finding it to be a great ingredient in moisturizing products, and it may help in defending against oxidative stress that contributes to some of the visible signs of skin aging. This far and away was my all-time favorite ectoin product. But oh my goodness, was it ever painful to buy this because it is so expensive at baseline. It's one of the most expensive products that I have bought, used, and wanted to rebuy over and over again and keep recommending, but it's like, dang, that price point is rough. So, look out for Paula's Choice sales. It's usually pretty good. [...] I would definitely [...] get it during the sale for sure."

"I finished a bottle of Paula's Choice Ectoin Booster serum. This is so good. It's very rich, very nourishing, very thick, very deeply hydrating. I even tried dragging this one out and not allowing myself to use it as many days because I wanted it to last. And I made it last a little bit longer this time around, but I went through it very quickly. This is one that I hate to say it, I probably at some point will repurchase again."

"I was able to layer this on over a layer of the Paula's Choice Ectoin Booster Serum, which if you've tried that product, you know it has more of an emollient finish. And I was able to layer this on over a layer of that without getting any peeling whatsoever."

"Ectoin is something that microorganisms make to help them survive in extreme conditions like really high salt, heat, ultraviolet radiation. When applied to our skin, it acts as a humectant and is also an antioxidant. [...] It's a lot more lightweight than the [Paula's Choice] one. It's more watery, but it is pretty emollient. [...] It is just not as rich as the [Paula's Choice] one. It doesn't have that glycerin in it and I'm thinking maybe that contributes to some of the richness of the [Paula's Choice]. I do think it can aid in dry skin, mature skin, where you have somewhat of a delay, a slowing down of epidermal maturation leading to a buildup of dry, rough skin texture coupled with a decline in water retaining abilities of the stratum corneum and a thinning of the stratum corneum. The thing I like about this serum is that it also has urea, which is one of my favorite humectants because it is part of skin's natural moisturizing factors. It's typically pretty well tolerated and depending on the overall formulation, may even help to gently exfoliate the skin. [...] I love the price point and I've continued to use it. I don't love it as much as the [Paula's Choice]."

"Leaves the skin very hydrated, glowy, soft, smooth. It's really not like I can't say anything bad about this other than oh my gosh, it is so painful to buy this little bottle."

"This sunscreen layers pretty well under makeup. [...] I did not encounter any issues with makeup products peeling up over the sunscreen, and it did not peel up over products, namely the Paula's Choice Ectoin serum, which yes, I have repurchased that. [...] If a product doesn't peel over that, it's probably not going to peel over whatever you're using. So I love it in that regard. It's very easy to work with and does not conflict with other products. [...] It achieves not only the makeup primer effect, but it's offering you broadspectrum sun protection."

"As far as ectoine standpoint, the Paula's Choice one is good. I would have ranked it very highly, [...] but I still would outrank Paula's Choice on this one. It's [...] better. I see more of a noticeable change with that product, and it's just a richer, nicer, more emollient texture, too."

"This is very emollient, very hydrating. You'll notice that many of the moisturizing serums, the milky toners that I gravitate to, they often have this slippery, hydrating, soothing texture. And I think that is a big factor in what led me to love this so much. Plus, it has the ectoin in there. So you're getting the benefits of that ingredient along with glycerin, which is hydrating. It's just so expensive. I don't know why it costs that much, honestly. Hopefully I can get it again on sale."

"This is the [Paula's Choice] 7% ectoine booster. Um, it's got a really nice kind of a milky texture to it."

"This one I would say is a great one for soothing skin if your skin is irritated from something. It's got a really nice milky texture to it. Ectoine in this is wonderful. You could use this on its own, you could mix it in with a serum or a moisturizer. It's really great for soothing skin because ectoin is just such a great magical ingredient for everything. It's great for soothing skin, it's great for antioxidants, it's great for protection. We've got 7% ectoin in here, and then we've also got some additional ingredients. We've got jojoba seed oil, great hydrant ingredient, and then also vitamin E. Really wonderful product. I like to apply it just when my skin is super dry in my evening routine. I'll just apply it just on its own, but you can certainly mix it with something if you want."

"It's really kind of almost like two layers. Deep hydration within the skin and then that skin softening moisture, that kiss just on top of the skin. And it's not really that heavy. While it's not as lightweight as a very truly watery serum or even a gellike consistency, this is on the medium light side as far as how it sits on the skin. Has an amazing absorbency as well. I fell in love with this over this past fall and winter season where my combination skin can go incredibly dry and dehydrated. Where I live in the upper Midwest, it starts to get very cold, the wind is very harsh, gets snowy and icy, and the dry air inside from all the heating wears down on my skin. My skin barrier felt weak and dehydration was going up. I honestly didn't even use it like a booster. I just subbed it in for my serum product. It was just one easy product that really showed the difference, that really gave me that long lasting hydration and relief from the dehydration. It really helped my skincare to last longer and to stand up to the elements and get my skin through this season."

"This one came in right at the end of 2025, but it really saved this season. We got like 10 inches of snow at the end of November, and it became winter overnight where I live. My skin overnight was like, 'Hello, you need to hydrate me. You need to moisturize me. You need to nourish me.' And I reached for the Paula's Choice Ectoin 7% Booster. My skin which was feeling inflamed, dehydrated, tight, a little itchy, very dry from that overnight winter was instantly feeling calmed, soothed. The inflammation, the redness that was starting to come through, especially around my chin, was instantly relieved. My skin, which was starting to feel dry and tight by four or five o'clock in the evening, all of a sudden was lasting throughout the day. I could get to my nighttime routine and my skin was comfortable and not dehydrated and tight. Ectoin is an ingredient that provides long-lasting hydration to the skin. It doesn't just hydrate the skin on contact and that feels nice, but ectoin actually creates this network of"

"Ectoin is fantastic for dehydrated skin. This product is good for dehydrated skin. My skin is dehydrated. And I love this product. [...] It's getting cold and that definitely means drier environment inside, cold, windy, harsh weather outside. My skin is feeling dehydrated for sure, but also dried out as well. And so this is the time of year where my combo skin, especially the T-zone, starts to go really dry. And the irritation from the dehydration can really settle in if it's not balanced out properly. [...] I'm actually waking up with a lot less of that because I've been working this into my skincare routine. [...] 7% ectoine, which I've been obsessed with ectoin for over two years now, and it's really had a moment this year."

"This is the Paula's Choice 7% Ectoin Booster. And this has been a savior for me in November and now in December. It has definitely been fighting the winter induced dehydration. It got real cold and real snowy real quick here and my skin all of a sudden overnight was really starting to feel it. And so this is amazing because ectoin, you know, it provides some long-lasting moisture in my skin and it really helps to fight that dehydrated feeling. And I like this milky texture too because just that kiss of extra moisture really suits my skin."

"This is Paula's Choice 7% Ectoin Booster. Love this stuff. [...] This is amazing for long lasting hydration. If you are suffering with dehydration, ectoin is an amazing humectant ingredient. It doesn't just make your skin feel hydrated on application. It actually creates a network of hydration within the skin that creates longer lasting hydration throughout hours and hours and hours, like even [...] 24 hours, 36 hours. The studies on ectoin for long lasting hydration are incredibly compelling. It's great for your skin barrier, but it's also very protective for your skin, too. It actually is a potent antioxidant and helps to protect from pollution. [...] There's pollution everywhere, and all of these things in our environment can actually create a lot of damaging inflammation in our skin. That's what speeds up the aging process. [...] So ectoin is protective, very hydrating and particularly special [...] for dehydrated skin. I love it. It's got a milky texture, but it actually thins out and sinks into the skin really quickly."