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K Secret

Collagen Boosting Secret Sun Lotion.

K Secret Collagen Boosting Secret Sun Lotion
Supplements

About this product

A Korean sunscreen lotion with SPF 50+ that combines sun protection with collagen, hyaluronic acid, peptides, niacinamide, and vitamin A for hydration and anti-aging benefits.

Best for

Mature skin
Supplements

The Guru Index verdict

87%

Approved

Approved · 87%
2Reviewers
2Approved
0Mixed
0Skip

What the gurus are saying

Gurus overwhelmingly champion this as a comprehensive one-product solution that functions as sunscreen and skincare routine combined. The standout praise centers on its exceptional hydration from 51% hydrolyzed collagen, plumping effect on fine lines, and new-generation filters requiring less frequent reapplication. A recurring theme is its ability to replace a separate moisturizer, streamlining morning routines. Gurus note it applies invisibly without white cast and suit drier skin types or those targeting early aging signs, with a slightly dewy finish many find flattering rather than heavy.
Synthesized from 2 expert reviews

Key actives & flags

NiacinamideHyaluronic acidFragrance-freeAlcohol-free

Full ingredients

Hydrolyzed Collagen(560,000Ppm), Dibutyl Adipate, Water, Propanediol, Isoamyl p-Methoxycinnamate, Diethylamino Hydroxybenzoyl Hexyl Benzoate, Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine, Terephthalylidene Dicamphor Sulfonic Acid, C12-15 Alkyl Benzoate, Niacinamide, Propylene Glycol Dicaprylate, Polyglyceryl-6 Stearate, Tromethamine, Cetearyl Alcohol, Hydroxyethyl Acrylate/​Sodium Acryloyldimethyl Taurate Copolymer, Potassium Cetyl Phosphate, Hydrogenated Palm Glycerides, Dipropylene Glycol, Hydroxyacetophenone, Polyglyceryl-6 Behenate, Caprylyl Glycol, Sphingomonas Ferment Extract, Adenosine, Sorbitan Isostearate, Hydrolyzed Hyaluronic Acid, Hyaluronic Acid, Hydrolyzed Sodium Hyaluronate, Sodium Hyaluronate Crosspolymer, Sodium Hyaluronate, Potassium Hyaluronate, Hydroxypropyltrimonium Hyaluronate, Dipotassium Glycyrrhizate, Sodium Acetylated Hyaluronate, Hydrolyzed Glycosaminoglycans, 1,2-Hexanediol, Glycerin, Glutathione

Every take, in full

What the gurus are saying.

Every take we've logged from this product's reviews across YouTube. Click any row to watch the moment they said it.

All takes Approved only Skip only Mixed only Hide sponsored
Approved
"This is the K Secret Collagen Boosting Secret Sun Lotion. I mention this all the time. It's still my favorite and it just does everything I want it to do. You've got everything in here to make a comprehensive skincare routine. It's broadspectrum and I think this is great for people that are prone to fine lines and wrinkles and want a sunscreen that won't grab onto them, won't sit in them and make them more noticeable. This plumps everything out. It reduces the appearance of fine lines and wrinkles and it just takes a few years off the skin. It nourishes the skin. It plumps. It hydrates. This has a more natural skin finish, less glow. It's sunscreen and skin care in a bottle."
Top Pick: sunscreen
All 9 takes from Mad About Skin
KOREAN SKINCARE SHOWDOWN - Best and Worst Korean Skincare 2025
"This is the K Secret Collagen Boosting Secret Sun lotion. Advanced technologies, new generation filters, a plethora of skin care benefits. This is sunscreen done right. I love my Korean sunscreens, and one of my personal favorites is this. If you're feeling a little intimidated by Korean skincare, start with the sunscreen and build from there, because I promise you, just one application of a good Korean sunscreen and you will be hooked."
ULTIMATE KOREAN SKINCARE - Next Level K-Skincare
"We've got a great dose of collagen which is going to plump out and hydrate the skin. You've got a great hyaluronic acid complex for the plumping, a wonderful thing. We've also got an amazing blend of different anti-aging peptides, some calming and soothing ingredients, a touch of nice niacinamide, and you've even got a dose of vitamin A which is going to be great for getting that cellular turnover going. This is almost an entire skincare routine in a bottle. For those of us that are looking to streamline and get out of the door in super quick time, cleanse the skin, maybe use your favorite toner, slap this on, you're protected, you haven't compromised in terms of your skincare routine, and you're getting a whole lot more than just sun protection. I don't think I can think of any other Western brand that offers such a comprehensive formulation in a sunscreen as this one."
KOREAN SKINCARE AWARDS 2024 - 5 Korean Skincare Brands You Need (*Not Sponsored*)
"The K-Secret Collagen Boosting Secret Sun Lotion is great if you've got a dryer skin type or first signs of aging and you want something to plump out the skin, nourish, and reduce fine lines and wrinkles. You've got peptides in here, you've got collagen in here, you've got great filters to protect against the sun. Both of these are gamechanging. At the moment, because it's cooler and my skin's a little drier, I tend to be going for this one, the collagen boosting one. In summer I'll switch to the other one for when my skin needs to look a little less dewy and a little bit more matte. Both are amazing."
KOREAN SKINCARE AWARDS 2025 - Very Best Korean Skincare
"This is the K Secret Collagen Boosting Secret Sun Lotion. Unlike a lot of brands which have formulated versions which comply with the outdated US regulations in order to access that market, K Secret said, 'No, we don't want to put garbage product out there. We only want the best.' I applaud that. I think that is fantastic messaging. It's putting the customer first and foremost. This is a 10 out of 10 product. When you buy this, you know you're getting the Korean version because there is only one version of it. It uses new generation filters which are going to be less sensitizing on the skin and give you great broad spectrum protection. You've got collagen, which is going to boost that plumpness in the skin and give you really nice nourishment and hydration. You've got hyaluronic acid, which is going to plump itself out to give that radiance boost to the skin. You've got vitamin A, which is going to help with cell turnover. You've got some calming and soothing ingredients and a touch of niacinamide. That niacinamide is at 2%, which is perfect for everyday use. This is almost like a sunscreen and a skincare routine in a bottle."
TOP 10 KOREAN SUNSCREENS - Korean Skincare Awards 🏆
"This is the K Secret Collagen Boosting Secret Sun Lotion. I mention this all the time. It's still my favorite and it just does everything I want it to do. You've got everything in here to make a comprehensive skincare routine. It's broadspectrum and I think this is great for people that are prone to fine lines and wrinkles and want a sunscreen that won't grab onto them, won't sit in them and make them more noticeable. This plumps everything out. It reduces the appearance of fine lines and wrinkles and it just takes a few years off the skin. It nourishes the skin. It plumps. It hydrates. This has a more natural skin finish, less glow. It's sunscreen and skin care in a bottle."
MAJOR MOISTURIZER MISTAKES - Stop Doing This In Your Skincare Routine
"One of my favorite sunscreens is the K-Secret Collagen Boosting Secret Sun Lotion. This is hydrating enough that if I use this in the morning I definitely don't need a moisturizer. My skin just doesn't need that level of hydration. This works and so you can save yourself a step, save yourself some of your coin, and prevent the skin feeling weighed down."
Top 10 SUNSCREENS 2025 - Best Sunscreens For Anti Aging
"This is basically a sunscreen and a skincare routine in a bottle. So in here you've got your niacinamide, you've got your peptides, your hyaluronic acid, you've got some collagen boosting ingredients, you've got all of that great sun protection in that SPF 50 plus. It's doing it all. If you're somebody that literally wants to wash your skin, throw on one product and walk out the door, this is that product. This does leave a slightly dewy finish on the skin which I think is great if you have a more mature skin. If you're looking for something that'll plump out some of the fine lines and wrinkles, won't catch in any of them, this is a great option. It's beautiful on the skin, absolutely stunning. And I would say it's also nice and hydrating too. So it's kind of like a moisturizer, a skincare routine, a sunscreen. It's an all-in-one. And for me, just an absolute gem."
ADVANCED ANTI-AGING SKINCARE - Best Sunscreen For Winter
"I love K Secret as a brand, great Korean brand, and this uses New Generation filters and the brand actually recommends you only need to reapply once every 8 hours so instead of reapplying every 2 hours which can become burdensome, this once every 8 hours is amazing. It's also packed full of collagen which is one of the best hydrated humectants you're going to find on the market. It's got some peptides in here for some additional skincare benefit and this is hands down one of the most hydrating sunscreens you will ever find. When this goes onto the skin, it's slightly thicker than some other Korean sunscreens which is good because you need that extra hydration, it just kind of locks it in that little bit more effectively. It's fragrance free which is beneficial if you're looking to minimize sensitivity. For the finish on the skin and the added hydration this is like 10 out of 10, Holy Grail territory. This is so hydrating you don't need a moisturizer alongside this unless you have super dry skin, so instead of thinking you've got to get another product for your morning skincare routine, just use this in the place of your moisturizer. Same number of products, same application time, and your skin will love it. It's quite affordable by Korean sunscreen standards, and they released their testing on this so you know exactly what you're getting in terms of performance."
NEXT LEVEL SUNSCREENS - Amazing Anti-Aging Skincare (re-upload)
"This is one of my favorites. The reason this is special and next level is it's actually formulated with 51% hydrolyzed collagen. Collagen is a super large molecule that just grabs on and retains all that moisture, plumps itself out, and in doing so minimizes fine lines and wrinkles and gives you a temporary plumpness and glow up to the skin, and this delivers it in bucket loads. It's also got four different peptides in so it works your peptide and your collagen all in one. The best thing about this I think is that it's got four new generation filters in, so this is much more photostable than some old style sunscreens, meaning you have to reapply less frequently. It's more convenient, just everything about this is amazing. It's also not ridiculously expensive either. Apply this to the skin and it just disappears without a trace. If you've got a deeper, darker, and richer skin tone and you're worried about your sunscreen potentially leaving some ashiness or white cast, don't worry, this won't. It's a chemical sunscreen and those filters will give you true broadspectrum coverage and just that beautiful glow up and plumpness at the same time."
Approved
"I love the way this hydrates my skin. I love the way it gives my skin the protection. You will literally use three products, you will get your vitamin C, you will get your peptides, it is fabulous. Three steps and your morning routine is over. You are glowing to the gods."
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