MissLJBeauty

Medik8 has been everywhere recently, especially when it comes to anti-ageing skincare and peptide serum recommendations, and the Medik8 Liquid Peptides Advanced MP serum is probably one of the most talked about products right now.

But I’ve been doing this long enough to know that hype doesn’t always mean results.

At the time I bought this, my skin had definitely started to change. I was noticing more fine lines on my forehead, my skin felt drier than usual, and my complexion just didn’t look as smooth. Makeup wasn’t sitting as well, and those early signs of ageing were becoming harder to ignore.

So I decided to properly test it. I bought it directly from the Medik8 website during a 20% offer, and I’ve been using the Liquid Peptides Advanced MP serum morning and evening for over two months.

This is my full, unsponsored Medik8 Liquid Peptides review. I’ve tested hundreds of skincare products over the years, and I always come back to formulas that actually improve my skin over time rather than just looking good for a few days.

Quick Answer: Is Medik8 Liquid Peptides Worth It?

If you’re short on time, here’s the honest answer.

The Medik8 Liquid Peptides Advanced MP serum is worth it if you’re starting to notice fine lines, wrinkles, loss of firmness or changes in skin texture and want a lightweight anti-ageing serum that actually improves your skin over time.

It won’t replace stronger actives like retinoids for deep-set wrinkles, but it does soften the appearance of fine lines, improve hydration and leave your skin looking smoother, plumper and more refined.

Quick Take

If you’re looking for a peptide serum that actually improves fine lines and skin texture, this is one of the best I’ve used.

It gives instant hydration and a plump, smooth skin feel, but the real results come over time. Fine lines and wrinkles look softer, skin looks firmer, and your overall complexion looks more refined.

It’s lightweight, easy to use in a skincare routine, and suitable for most skin types including dry and combination skin.

Expensive, but genuinely worth it if you’re serious about anti-ageing skincare.

About the Brand

Medik8 is known for results-driven skincare that supports the skin’s natural age-defying process.

They focus on ingredients like peptides, vitamin C and retinoids, building routines that improve the skin over time rather than relying on quick fixes.

What Is Medik8 Liquid Peptides Advanced MP?

The Medik8 Liquid Peptides Advanced MP serum is a multi-peptide anti-ageing serum designed to:

Reduce fine lines and wrinkles

Improve the appearance of expression lines

Support collagen production

Strengthen the skin barrier

Deliver deep hydration

How Long Does Medik8 Liquid Peptides Take to Work?

This is one of the most searched questions, and it’s important to be realistic.

From my experience using the Medik8 Liquid Peptides Advanced MP serum:

Immediately: Skin feels more hydrated and looks slightly plumper thanks to hyaluronic acid

1–2 weeks: Skin starts to feel smoother, and makeup sits better

3–4 weeks: Fine lines begin to look softer, especially expression lines

6–8 weeks: Skin looks more refined overall, with improved texture and firmness

Packaging

The packaging feels very premium.

It’s a heavy glass bottle with a clean, minimal design that fits perfectly with Medik8’s clinical but luxury aesthetic. The pump is controlled and gives the right amount of product, which is important with a serum at this price.

Key Ingredients in Medik8 Liquid Peptides (and Why They Work)

Matrixyl 3000 (Palmitoyl Tripeptide-1 & Palmitoyl Tetrapeptide-7)

Copper Peptides (Copper Palmitoyl Heptapeptide-14)

Carnosine

Hyaluronic Acid

Multi-Peptide Complex

The Medik8 Liquid Peptides Advanced MP serum contains a high-strength multi-peptide complex made up of multiple peptides that work together across multiple skin layers.

Some target collagen, others hydration, and others the appearance of fine lines and wrinkles. This is why it delivers both instant and long-term results.

Peptides are often described as building blocks for the skin. In simple terms, they’re short chains of amino acids that help signal your skin to produce more collagen, which is what keeps skin looking firm, smooth and more youthful.

As we get older, collagen production naturally slows down, which is when you start to notice fine lines, expression lines and changes in skin texture. That’s where a peptide serum like this comes in, it helps support the skin’s natural processes rather than forcing quick results. 

It’s one of those ingredients that doesn’t give dramatic overnight results, but over time it can make a noticeable difference to how your skin looks and feels.

Texture and Scent

The texture is lightweight and smooth, but not watery. It actually reminds me a bit of a silicone-style primer, which I wasn’t expecting from a serum.

When you first apply it, it glides over the skin really easily and spreads without needing much product. I only use one pump for my whole face, and that’s more than enough. It feels silky going on, but not heavy or greasy, and it sinks in quickly without leaving any residue behind.

Once it’s absorbed, my skin feels soft, hydrated and slightly tighter. It’s that kind of finish where your skin just feels a bit more put together, which is why it works so well under makeup. It doesn’t pill, it doesn’t sit on the surface, and it layers really nicely with moisturiser and SPF.

How I Use It

I use one pump for my whole face, and that’s genuinely enough. It spreads really easily, so you don’t feel like you need to go back in with more, which definitely helps justify the price a bit.

I apply it morning and evening after cleansing, but I don’t overcomplicate things with it. I like to keep this step quite simple so I can actually see how it’s performing on my skin, rather than layering too many products on top.

In the morning, I use it before moisturiser and SPF, and it sits really nicely under makeup. It gives that slightly smoother base, which I’ve noticed makes a difference, especially around areas where I have a bit more texture.

In the evening, I use it the same way, but I avoid using it in the same routine as stronger actives. If I’m using a retinoid or anything more intense, I’ll alternate instead. I’ve found that works much better for my skin and avoids any irritation.

It’s one of those products that’s really easy to fit into a routine. It doesn’t feel like an extra step, which makes it much easier to stay consistent with.

This is how it actually fits into my routine day to day.

Morning:
Cleanser → Medik8 Liquid Peptides → Moisturiser → SPF

Evening:
Cleanser → Medik8 Liquid Peptides → Moisturiser

I use it both morning and evening, but I don’t use it in the same routine as tretinoin or stronger exfoliating acids. I’ve found it works best when I alternate rather than layering too many stronger actives at once.

In my routine, I tend to keep things fairly simple around this. I’ll usually pair it with a gentle cleanser, a hydrating moisturiser and SPF in the morning. That seems to give me the best results without irritating my skin.

When Should You Use Medik8 Liquid Peptides?

You can use the Medik8 Liquid Peptides Advanced MP serum both morning and evening, depending on your skincare routine.

In the morning, it works well under moisturiser and SPF, helping to hydrate the skin and create a smoother base for makeup.

How It Compares to Your Existing Skincare Routine

If you already have a solid skincare routine, this fits in quite easily.

For me, it doesn’t replace anything. It sits alongside my existing skincare products and improves how everything works together.

What Doesn’t Work Well with Medik8 Liquid Peptides?

One of the good things about Medik8 Liquid Peptides is that it’s generally easy to use and works well with most skincare products.

That said, I’ve found it works best when I’m mindful about stronger actives. I personally avoid using it in the same routine as tretinoin or stronger exfoliating acids, not because you absolutely can’t, but because I’d rather keep things simple and avoid irritation.

For me, this serum works best when it’s supporting my skin rather than competing with lots of stronger actives in one routine.

What Skin Concerns It Helps With

This is one of those anti-ageing skincare products that targets multiple concerns at once, including fine lines, expression lines and even the early stages of deeper lines, especially around areas like the forehead and around the eyes where they tend to show first.

Fine lines and wrinkles

Expression lines

Dry skin

Uneven texture

Early signs of ageing

Loss of firmness

My Skin Type and Why This Matters

My skin is combination, and it definitely changes depending on what I’m doing and the time of year. I do get dryness, especially after being outside a lot or in colder weather, but I also deal with a bit of congestion around my nose and chin.

Because I’m usually out walking Mylo, riding or just generally not sitting still, I’m not testing skincare in perfect conditions. It needs to actually work in real life, with wind, sweat and long days where my skin would normally start to feel tight or look a bit tired.

My Experience Using Medik8 Liquid Peptides

After looking at the ingredients and what the Medik8 Liquid Peptides Advanced MP serum is designed to do, this is how it actually performed on my skin over time.

My Honest Review (2 Months of Using Medik8 Liquid Peptides)

Week 1

Straight away, my skin felt more hydrated and looked noticeably more plump, especially across my forehead where I tend to see the first signs of fine lines.

The hyaluronic acid gives that instant smoothing effect, and within minutes my skin looked softer and a bit more filled out. Medik8 talks about reducing the look of lines in just 10 minutes, and while I wouldn’t say they disappear, I did notice that my fine lines looked less obvious straight after applying it.

There’s also a slight tightening feeling when it sinks in, which I actually really liked. It makes your skin feel a bit firmer without feeling dry or uncomfortable, which can sometimes happen with products that give that effect.

Weeks 2 to 4

This is where it started to feel like more than just hydration.

The first thing I noticed was my skin texture. It felt smoother to the touch, and more importantly, it looked smoother and a bit more filled out, if that makes sense.

Makeup sat better, especially around my forehead and nose where I can sometimes get a bit of uneven texture. I noticed it most when I was getting ready in natural light rather than a mirror with good lighting, which is usually where I spot fine lines the most.

Then I started paying more attention to my fine lines, particularly on my forehead. They weren’t gone, but they looked softer and less defined, especially in natural light where I normally notice them the most.

I also started to notice a difference around my eyes. The lines there looked a bit softer and less obvious, especially when my skin was well hydrated.

Weeks 5 to 8

One thing I really noticed was how this performed in real life, not just in a mirror. On days where I’d been outside a lot, in wind or colder weather, my skin still felt comfortable by the end of the day. Normally that’s when my skin starts to feel tight or dry, but with this it stayed hydrated.

It also made a difference with makeup. Foundation just sat better, especially around my forehead where fine lines can sometimes catch product. It didn’t completely blur everything, but it definitely made things look smoother and more even.

There were a couple of days where I didn’t use it, and while my skin didn’t suddenly look worse, it just didn’t look quite as smooth or as put together as it does when I use it consistently.

Long Term Results

After using the Medik8 Liquid Peptides Advanced MP serum consistently for a couple of months, the biggest difference for me isn’t just one specific thing, it’s how my skin looks overall.

My skin feels more hydrated day to day, but not in a heavy way. It just feels more comfortable and balanced, especially on days where it would normally feel a bit dry or tight.

Texture-wise, my skin looks smoother and more even, which has made a noticeable difference when I’m wearing makeup. Foundation sits better and doesn’t catch on the areas where I’d usually notice uneven texture.

The biggest change for me has been in my fine lines, particularly on my forehead. They’re still there, but they look softer and less defined, especially in natural light where I’d normally notice them the most. I’ve also seen a difference around my eyes, where expression lines tend to show up first. They look less obvious and a bit smoother overall.

My skin also feels slightly firmer. Not dramatically lifted, but enough that my complexion looks more refined and less tired.

It’s not a dramatic overnight transformation, but it’s one of those products where your skin just gradually looks better the longer you use it, which is exactly what I want from an anti-ageing serum. 

What Surprised Me Most

If I’m being honest, I didn’t want to love this.

It’s expensive and it’s been everywhere, which usually makes me a bit sceptical. I expected it to feel nice, but not do much long term.

What surprised me most is how much I actually like it. It’s not dramatic overnight, but my skin just looks better when I use it. Smoother, more refined, and a bit more even overall.

I started to notice that on days I used it, my skin just looked better, especially around my forehead where I tend to see fine lines first. And when I skipped it, I could actually tell the difference.

Would I Repurchase?

Yes, I would.

My Honest Take

This is definitely a long-term skincare product.

It’s not one of those things you use once and suddenly see a huge difference, but if you use it consistently, it really does improve how your skin looks over time.

For me, it’s been more about how my skin looks overall. Smoother, a bit more refined, and my fine lines are definitely less noticeable than they were.

How It Performs in Real Life (Makeup, Weather and Daily Wear)

This is where the Medik8 Liquid Peptides Advanced MP serum really stands out day to day.

Under makeup, it acts almost like a smoothing base. Foundation sits better, especially around fine lines and texture, and it helps everything look a bit more even without feeling heavy.

On colder or windier days, my skin still feels hydrated by the end of the day, which isn’t always the case with lighter serums. It doesn’t disappear or leave my skin feeling tight.

Who Is Medik8 Liquid Peptides Best For?

The Medik8 Liquid Peptides Advanced MP serum is best for anyone starting to notice early signs of ageing, especially fine lines, wrinkles and changes in skin texture.

It works particularly well for dry and combination skin, as it provides hydration without feeling heavy. It’s also a great option if your skin is becoming slightly more sensitive and you want an anti-ageing serum that supports the skin barrier rather than causing irritation.

Who Is Medik8 Liquid Peptides Not For?

This is something a lot of reviews skip, but it matters.

The Medik8 Liquid Peptides Advanced MP serum might not be for you if:

You’re looking to treat deep wrinkles quickly

You prefer strong actives like retinoids or exfoliating acids

You want a budget-friendly skincare routine

You’re very young and don’t have any visible signs of ageing yet

Medik8 Liquid Peptides vs Other Peptide Serums

If you’re trying to choose between peptide serums, the biggest difference usually comes down to how advanced the formula is and what results you actually want from your skincare.

Some peptide serums focus mainly on hydration and general skin support. Medik8 Liquid Peptides feels more like a treatment serum. It still hydrates the skin, but it also works over time to improve fine lines, skin texture and overall skin quality.

Medik8 Liquid Peptides vs Hyaluronic Acid Serums

Hyaluronic acid serums focus mainly on hydration.

Medik8 Liquid Peptides vs Retinol / Retinoids

Retinoids tend to work faster when it comes to deeper wrinkles, but they can also cause irritation, especially if your skin is sensitive.

Medik8 Liquid Peptides is much gentler. It works by supporting the skin rather than forcing rapid cell turnover, which makes it a good option if your skin is more reactive or if you want something you can use both morning and evening.

Medik8 Liquid Peptides vs The Ordinary Buffet

There are more affordable options like The Ordinary Buffet, but in my experience, they don’t deliver the same level of smoothing and long-term skin improvement.

But the Medik8 Liquid Peptides Advanced MP serum feels more refined overall. It absorbs better, layers more easily, and in my experience gives more noticeable improvements in skin texture, hydration and the appearance of fine lines over time.

What Is the Highest Rated Peptide Serum?

This is something that comes up a lot when you start looking into peptide serums.

There isn’t one single “highest rated” peptide serum because it depends on what you’re looking for, your skin type and how your skin responds to different ingredients.

That said, the Medik8 Liquid Peptides Advanced MP serum is definitely one of the most talked about and highly rated options when it comes to anti-ageing skincare. It combines multiple peptides, including Matrixyl 3000 and copper peptides, which are both well known for supporting collagen production and improving the appearance of fine lines and wrinkles.

Compared to more basic peptide serums, it feels more advanced and more results-driven. There are more affordable options like The Ordinary Buffet, but in my experience, the Medik8 version delivers more noticeable smoothing, hydration and overall skin improvement over time.

Before You Buy Medik8 Liquid Peptides

I always think this is one of the most important sections in any review. Because as good as this is, it’s not for everyone.

Buy This If:

You’re starting to notice fine lines and wrinkles

Your skin feels less smooth or slightly textured

You want an anti-ageing serum without irritation

You prefer lightweight skincare that layers well

Don’t Buy This If:

You’re expecting instant results on deep-set wrinkles

You already use strong actives like retinoids and want dramatic results

You’re on a tight budget and want a basic hydrating serum

Is Medik8 Liquid Peptides Worth It?

This is an expensive anti-ageing serum, there’s no getting away from that.

But after using it properly, I do think it’s worth it.

For me, it’s not one big dramatic change, it’s how my skin looks overall. It’s smoother, a bit more refined, and my fine lines, especially on my forehead, are definitely less noticeable than they were.

You also get that instant plumping effect when you apply it. Medik8 talks about lines in just 10 minutes, and while I wouldn’t say they disappear, my skin does look softer straight after using it.

Where this really stands out is over time. If you use it consistently, it improves your skin in a way that just looks natural, not overdone or irritated.

If you’re looking for a quick fix, this probably isn’t it.

But if you want something that fits easily into your routine and actually improves your skin long term, this is one of the better peptide serums I’ve used.

Skin Type Breakdown

I think this works best if your skin is starting to change rather than if you’re dealing with one specific issue.

For dry skin, it’s great for adding hydration without feeling heavy. It gives that plump, comfortable feeling without needing to rely on thick creams.

For combination skin, which is where I sit, it works really well. It hydrates the drier areas but still feels lightweight enough that it doesn’t overwhelm the rest of your skin or make it feel greasy.

If you have oily skin, the texture is light enough that it shouldn’t feel too much. It absorbs quickly and doesn’t leave that heavy or sticky finish that some anti-ageing serums can.

For more mature skin, I think this works well as part of a routine. It helps with firmness and the appearance of fine lines and wrinkles, but I’d probably use it alongside stronger actives rather than expecting it to do everything on its own.

Pros and Cons

The biggest benefit for me is how it improves my skin overall without causing any irritation. It’s one of those products that just makes your skin look better over time, smoother, more refined and a bit more even, without feeling harsh or overwhelming.

I also really like how lightweight it is. It fits into my routine easily, layers well with other skincare products, and works just as well in the morning under makeup as it does at night.

The downside is definitely the price. It’s not something you pick up without thinking, and I do wish it was a bit more affordable.

Price and Value

I paid £63.20 with a discount for 30ml, so this is definitely not a cheap skincare product. RPR is £79

That said, you only need one pump for your whole face, and it spreads really well, so a bottle does last longer than you might expect. It’s not something you’re getting through quickly, especially if you’re using it consistently morning and evening.

For me, the value comes down to the results over time. It’s not just a basic hydrating serum, it actually improves how my skin looks, especially in terms of texture and fine lines, which makes it feel more like a treatment rather than just another step in my routine.

At full price, this is around £79, and Medik8 estimates you’ll get about 80 uses per bottle. That works out at roughly £0.99 per use. When you look at it like that, it feels more like a treatment step rather than just another serum in your routine.

I still think it’s expensive, and it’s not something I’d recommend if you’re just starting out with skincare.

Final Thoughts

The Medik8 Liquid Peptides Advanced MP serum is one of those products that quietly improves your skin over time.

It’s not dramatic, and it’s not trying to be, but the longer you use it, the more you notice the difference. My skin looks smoother, a bit more refined, and my fine lines, especially on my forehead, are definitely less noticeable than they were. As an anti-ageing peptide serum, it’s one of the more advanced options I’ve used when it comes to improving fine lines, hydration and overall skin quality.

If you’re starting to notice changes in your skin, whether that’s fine lines, texture or just that it doesn’t look as smooth as it used to, this is a really easy product to add into your routine.

FAQs

Can you use Medik8 Liquid Peptides every day?

Yes, you can use Medik8 Liquid Peptides Advanced MP every day, both morning and evening. It’s a gentle peptide serum designed for daily use. I personally use it twice a day, but I avoid using it in the same routine as stronger actives like tretinoin or exfoliating acids to keep my skin balanced.

How long does Medik8 Liquid Peptides take to work?

You’ll notice some immediate hydration and a slightly plumper look straight after applying it, but the real results come with consistent use. For me, my skin felt smoother within a couple of weeks, and I started to notice softer fine lines after around 4 to 6 weeks. It’s definitely more of a long-term skincare product rather than a quick fix.

Does Medik8 Liquid Peptides reduce fine lines and wrinkles?

Yes, Medik8 Liquid Peptides helps reduce the appearance of fine lines and wrinkles over time. It doesn’t remove deep-set wrinkles instantly, but it softens how they look, especially expression lines on the forehead and around the eyes, while improving overall skin texture and hydration.

Does Medik8 Liquid Peptides feel sticky or greasy?

No, it’s actually very lightweight. It has a smooth, almost primer-like texture that absorbs quickly into the skin. It doesn’t leave a greasy or sticky finish, which is why it works so well under moisturiser, SPF and makeup.

Can you use Medik8 Liquid Peptides with vitamin C?

Yes, Medik8 Liquid Peptides works well with vitamin C. I tend to use vitamin C in the morning and layer Medik8 Liquid Peptides underneath moisturiser and SPF. Vitamin C helps with brightness, while peptides support hydration and the appearance of fine lines.

Is Medik8 Liquid Peptides good for combination skin?

Yes, it works really well for combination skin. It hydrates the drier areas without feeling heavy, but it’s still lightweight enough that it doesn’t make the rest of your skin feel greasy. That’s one of the reasons I’ve found it so easy to use consistently.

Is Medik8 Liquid Peptides overhyped?

I expected it to be, if I’m honest. But after using it consistently, I do think it lives up to the hype. It’s not an overnight miracle, but it’s one of those products that makes your skin look better over time, which is why so many people keep repurchasing it.

Does Medik8 Liquid Peptides help with lines around the eyes?

Yes, it can help soften the appearance of lines around the eyes, especially when they’re caused by dehydration or early expression lines. It won’t remove deeper lines completely, but with consistent use, it can make them look less defined and the skin look smoother overall.

Can you use Medik8 Liquid Peptides with tretinoin?

You can use Medik8 Liquid Peptides with tretinoin, but I wouldn’t recommend using them in the same routine. I personally alternate between the two to avoid irritation and get the best results from both products.

Is Medik8 Liquid Peptides worth the price?

It is an expensive serum, but if you’re consistent with it, it does deliver results. For me, the value comes from how it improves overall skin quality over time, smoother texture, better hydration and softer fine lines, rather than one instant dramatic change.

Author Bio

Laura Martin is the founder of MissLJBeauty.com, an award-winning UK beauty and lifestyle blog. She is a qualified makeup artist and skincare specialist, with over 15 years of experience testing skincare in real-life conditions. She shares honest, experience-led reviews focused on what actually works, not just what looks good online.