Index / K-Secret / Collagen Boosting Secret Sun Lotion SPF 50+
K-Secret

Collagen Boosting Secret Sun Lotion SPF 50+.

K-Secret Collagen Boosting Secret Sun Lotion SPF 50+
Sunscreen

About this product

A hydrating sunscreen lotion formulated with collagen, peptides, hyaluronic acid, and vitamin A, designed to combine UV protection with anti-aging and plumping skincare benefits.

Full ingredients

Guru Score

87%

Yay

Early verdict · Few reviews so far
2Gurus
2Yay
0Mixed
0Nay

What they liked

  • Hydrating enough to skip a separate moisturiser
  • Absorbs without a trace or white cast
  • Plumps fine lines without catching in them

What they flagged

    Nothing. None of the experts who reviewed it raised a problem.

    What the gurus are saying

    This sunscreen hydrates deeply enough that some gurus skip moisturizer entirely afterwards, thanks to its 51% hydrolyzed collagen content and hyaluronic acid complex. Mad About Skin praises it as a complete skincare routine in one bottle, particularly for dry or maturing skin wanting to plump fine lines, and notes it can be switched for a mattifying formula in summer if needed. One sponsored reviewer mentioned the included retinol eye patches contain 0.1% retinol, the gentlest concentration, though they suggest using the product sparingly given its price point.
    Synthesized from 2 expert reviews · most recent take September 2025

    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 Yay takes Nay takes Mixed takes Hide sponsored
    Yay
    "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. You could cleanse the skin, put this on, and you would get great results. 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. If you have a sunscreen that grabs at every fine line and crows feet that you have and you hate that, try this. This does the opposite. It nourishes the skin. It plumps. It hydrates. This has a more natural skin finish, less glow."
    Top Pick: sunscreen
    All 12 takes from Mad About Skin
    KOREAN SKINCARE SHOWDOWN - Best and Worst Korean Skincare 2025
    "One of my personal favorites is this. 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. And like I say, 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."
    Top ANTI AGING KOREAN SKINCARE - Botox Alternatives For Anti Ageing
    "This is the K-Secret Collagen Boosting Secret Sun Lotion. [...] K-Secret is the same brand that did those eye patches I absolutely love them, they're quickly becoming my favorite skincare brand of 2024. [...] I love this because just look at the ingredients. You've got hydrolyzed collagen which is going to plump out the skin, you've got a hyaluronic acid complex with multiple different molecular weights to deeply nourish and hydrate, you've got peptides in here, you've got calming and soothing ingredients, niacinamide to fade hyperpigmentation. It does it all and it's also proven. [...] You're also getting SPF 50 plus with a really good UVA protection too, so this is ticking every box of a sunscreen. [...] When you put this on your skin it instantly hydrates it, instantly plumps it out, it disappears to nothingness so you don't know you're wearing anything. It's like a hug in a sunscreen. Your skin will look so glowy, juicy, plump and fabulous after it."
    ULTIMATE KOREAN SKINCARE - Next Level K-Skincare
    "We've also 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, you've got some calming and soothing ingredients, you've got 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 so for those of us that are looking to streamline, 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. This is what I mean by innovation. I can't think of any other Western brand that offers such a comprehensive formulation in a sunscreen as this one."
    End Of KOREAN SKINCARE ? - After The Korean Sunscreen Scandal
    "This is something truly special if your primary focus is anti-aging. Not only do you get that guaranteed SPF 50 plus, they've released the testing so we know that's exactly what it's delivering, but you also get a range of different ingredients which are going to boost the anti-aging potential of your routine. So in here you've got some hydrolyzed collagen which is going to instantly plump and smooth, you've got a peptide complex which is fantastic for long-term anti-aging, some antioxidants in here, calming and soothing ingredients. And let me tell you, this has the nicest finish on the skin. It's wonderfully hydrating, that collagen really does give some hydration and plumping, but you work this in and it disappears without a trace. It just leaves behind the most perfect finish to the skin. You can put your makeup on top of it and it'll last all day long. This is one of my personal favorites and I'll use this in the cooler winter months where I need a little bit more hydration for my skin. This is a go-to every single time."
    Urgent KOREAN SUNSCREEN WARNING - Know What You Are Buying (Korean SPF)
    "This is one of my favorite sunscreens. This is the K-Secret Collagen Boosting Secret Sun Lotion. If you're buying this from any country of the world outside the US, you will get the new generation filters. You'll get the old style US compliant filters if you're shopping from within the US. This is a brand that's committed to that integrity and transparency."
    KOREAN SKINCARE AWARDS 2024 - 5 Korean Skincare Brands You Need (*Not Sponsored*)
    "If you've got a dryer skin type or first signs of aging you want something to plump out the skin nourish reduce fine lines wrinkles this will do it. 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 gamechanging. At the moment because it's cooler my skin's a little drier, I tend to be going for this one which is the collagen boosting one. In summer I'll switch to the other one, which is why I've got it on hand just for when my skin needs to look a little less dewy and a little bit more matte. This is the one I'll go for. Both 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.' They're putting the consumer first and only coming out with the very best products, and I applaud that. 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. It's got collagen, which is going to boost that plumpness in the skin and give you really nice nourishment and hydration. You've got some 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. You could cleanse the skin, put this on, and you would get great results. 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. If you have a sunscreen that grabs at every fine line and crows feet that you have and you hate that, try this. This does the opposite. It nourishes the skin. It plumps. It hydrates. This has a more natural skin finish, less glow."
    MAJOR MOISTURIZER MISTAKES - Stop Doing This In Your Skincare Routine
    "One of my favorite sunscreens is this K-Secret Collagen Boosting Secret Sun Lotion. This is hydrating enough that if I use this on a 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 the K-Secret Collagen Boosting Secret Sun Lotion. This is basically a sunscreen and a skincare routine in a bottle. 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. So if you're somebody that literally wants to wash your skin, throw on one product and walk out the door, this is that product. Sunscreen and skin care all in one. 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. It is slightly on the dewy side, and a lot of people like that. I think this is a great option for streamlining but maintaining those results."
    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 which is amazing. In winter it's also packed full of collagen which is one of the best hydrating 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, prepare to be shocked because it's slightly thicker than some other Korean sunscreens which is good because you need that extra hydration. It just locks it in that little bit more effectively. But look at that, gone without a trace. You can't feel it on the skin, you have no idea you're wearing it. It's fragrance free which is beneficial if you're looking to minimize sensitivity. For the finish on the skin, for 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 I've got to get another product for my 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 so the reason this is special and next level is this is actually formulated with 51% hydrolyzed collagen. If you've been around on the channel for some time you'll know one of my favorite humectants is collagen, it's 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, give 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. And 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 which I love. Apply this to the skin and it just disappears without a trace. So 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 will. It's a chemical sunscreen and I think those filters will give you true broadspectrum coverage and just that beautiful glow up and plumpness at the same time."
    Yay
    "I love the way this hydrates my skin. I love the way it gives my skin the protection. We are going to be entering fall and winter, this is going to be ideal because 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."
    Sponsored

    What the evidence says.

    Independent of what the gurus think, this is what the published research supports about the main active ingredients here.

    Niacinamide

    Niacinamide has evidence behind it for redness, uneven tone and supporting the skin barrier, and it is usually well tolerated even by skin that reacts to most things.

    Source: DermNet

    Humectants and emollients

    Ingredients like these draw water into the surface layers and slow how fast it leaves. The evidence is for comfort, softness and hydration rather than for changing the structure of the skin.

    Source: DermNet

    Frequently asked.

    What is K-Secret Collagen Boosting Secret Sun Lotion SPF 50+?

    A hydrating sunscreen lotion formulated with collagen, peptides, hyaluronic acid, and vitamin A, designed to combine UV protection with anti-aging and plumping skincare benefits.

    Is K-Secret Collagen Boosting Secret Sun Lotion SPF 50+ worth it?

    Yes. All 2 gurus who reviewed it give it their stamp of approval, for a Guru Score of 87%.

    What is K-Secret Collagen Boosting Secret Sun Lotion SPF 50+'s Guru Score?

    K-Secret Collagen Boosting Secret Sun Lotion SPF 50+ holds a Guru Score of 87%. That is our read on how warmly the experts talk about it, based on the verdicts of 2 expert reviewers we have collected. At least one expert has named it a Top Pick in its category.

    Who is K-Secret Collagen Boosting Secret Sun Lotion SPF 50+ best for?

    K-Secret Collagen Boosting Secret Sun Lotion SPF 50+ is generally suited to mature skin.

    Similar products worth a look.

    Other products the same gurus have weighed in on, plus more from this brand and category.

    Compare side by side →

    Share this score

    Add this badge to your blog or website. It links back to this page and updates itself when the experts change their minds. Free, no sign-up.

    Then paste it into your site's HTML or embed block.

    This week's top beauty news, in your inbox.

    A weekly read of the takes worth catching up on: the raves, the splits, the ones the gurus won't shut up about. Free, no spam, unsubscribe whenever.

    Subscribe to the digest