There are so many skincare ingredients out there. Some are obscure and buried in a label’s fine print, while others are trendy buzzwords splashed across every beauty campaign.
But how often do you actually stop and ask what a so-called miracle ingredient really does? It’s easy to get caught up in the marketing, which makes it hard to tell what’s genuinely beneficial and what’s just hype.
Peptides are one of those ingredients that get a lot of attention. Brands, influencers, and beauty gurus are constantly praising them as a must-have for your beauty routine.
And the truth is, they are amazing for both skincare and haircare goals. But if you want to use them effectively and truly understand the products you’re investing in, you need to know what peptides are and how they actually work.
What Are Peptides Used For? Skin, Brows, and Lashes
We love decoding buzzy skincare ingredients. From soothing allantoin and hydrating squalane to calming bisabolol and brightening pearl powder, we’ve broken down what they actually do and how to use them.
Today, we’re doing the same with peptides. Because while the word gets thrown around constantly, most people don’t actually know what peptides are, how they function, or why they’re so powerful for skin, brows, and lashes.
Here’s what you need to know:
What Are Peptides?
Peptides are short chains of amino acids naturally found in the body that help form and support essential proteins like collagen, elastin, and skincare. Think of it this way: amino acids are individual building blocks of proteins. Peptides are small groupings of those units that form proteins.
So, although peptides are naturally occurring, they’re also super beneficial skincare ingredients. They act as signaling molecules, telling cells when to repair, produce collagen, build muscle, reduce inflammation, and more! This makes them essential for skin firmness, hair growth, muscle recovery, and overall cellular health.
What Are the Different Types of Peptides?
There are several different peptides, each responsible for different functions within the skin. Here’s a breakdown of the most common types of peptides used in skincare and how each one works:
Signal/Growth Peptides
These peptides send messages to your skin to produce more collagen, elastin, and keratin. This triggers natural repair and regeneration, which is perfect for anti-aging skincare products and brow/lash serums.
Types of signal/growth peptides include:
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Palmitoyl Pentapeptide-4
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Palmitoyl Tripeptide-1
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Palmitoyl Tetrapeptide-7
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Acetyl Tetrapeptide-5
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Oligopeptide-1 (EGF)
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Myristoyl Pentapeptide-17 (common in lash serums)
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Myristoyl Hexapeptide-16
Signal peptides improve skin firmness, help reduce the appearance of fine lines and wrinkles, and support a smoother texture. Pretty impressive!
Carrier Peptides
Carrier peptides deliver nutrients like copper and manganese deep into the skin. These trace elements help with healing, collagen production, and tissue repair. You’ll find carrier peptides in anti-aging skincare, hair treatments, and post-procedure products.
Types of carrier peptides include:
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Copper Tripeptide-1
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GHK-Cu (Copper Peptide)
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Manganese Tripeptide-1
You’ll typically see the most benefit from these peptides on post-procedure skin or skin with acne scars. Even better, they’re one of the least irritating peptides, so many people tolerate them well!
Enzyme-Inhibitor Peptides
There are actually enzymes in our bodies that break down collagen and elastin, working against our skincare goals. However, enzyme-inhibitor peptides slow the degradation process to maintain firm, plump skin.
Types of enzyme inhibitor peptides include:
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Acetyl Tetrapeptide-11
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Tripeptide-10 Citrulline
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Dipeptide Diaminobutyroyl Benzylamide Diacetate
Enzyme-inhibitor peptides protect existing elastin fibers—especially from damage caused by UV radiation, pollution, and lifestyle factors. So if you’re looking for a preventative anti-aging ingredient? You just found one.
Neurotransmitter Peptides
In the skincare world, these are actually called “Botox-like peptides.” Why? Because they can smooth wrinkles and prevent muscle contraction in the skin—exactly what Botox injections do! They’re one of the best additions to anti-aging products.
Types of neurotransmitter peptides include:
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Acetyl Hexapeptide-8 (Argireline)
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Pentapeptide-18
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Acetyl Octapeptide-3
More specifically, neurotransmitter peptides target dynamic wrinkles—the ones caused by repetitive muscle movements. Think: smiling, frowning, frustration. Similar benefits to Botox without the needle.
Antimicrobial Peptides
This type of peptide can kill bacteria and neutralize toxins on the surface of the skin. You’ll find these in acne treatments, barrier-repair creams, and even medical-grade skincare to keep your skin balanced, clear, and healthy.
Types of antimicrobial peptides include:
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Palmitoyl Tripeptide-8
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Sh-Oligopeptide-1
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Human Oligopeptide-20
Antimicrobial peptides are huge for skin health. By strengthening the skin barrier, people tend to notice improvements in conditions like chronic acne, eczema, and rosacea.
Bioactive Peptides
So far, we’ve only discussed topical peptides. That said, there are bioactive peptides you can take as a supplement. (We love Vital Proteins collagen Peptides.)
These are the inside-out version of beneficial peptides. Often, they’re used to support muscle growth, recovery, and even blood sugar balance. That means it could be good for strength training and weight loss.
Some more advanced peptides can influence hormones like luteinizing hormone. However, those are medical-grade and not the same as your daily collagen scoop.
As always, benefits and potential side effects depend on the specific peptide and its use. Talk to your doctor before starting any new supplements.
Types of bioactive peptides include:
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Hydrolyzed Collagen Peptides
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Collagen Tripeptides
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Casein-Derived Peptides
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Whey-Derived Peptides
How Do Peptides Work Topically?
Our skin and hair go through a constant renewal cycle that keeps us looking youthful and healthy. But, over time, collagen and elastin naturally break down. It could be due to aging, sun exposure, or even pollution.
Obviously, that’s a problem for your beauty goals. And you can’t just add collagen directly to your skin. It’s impossible to absorb that way.
Instead, peptides act as messengers to encourage your skin to produce more collagen and elastin. This can make your skin firmer, smoother, and more resilient. And healthy skin means healthy follicles, which means better hair growth too!
What Do Peptides Do for Skin?
Stimulate Collagen Production
As we’ve discussed, peptides help support and rebuild skin structure. Signal and growth peptides will do this best!
Essentially, they “trick” your skin cells, making them think you have an injury. Peptides rush to the job, producing additional collagen, elastin, and hyaluronic acid.
Strengthen Skin Barrier
Carrier and antimicrobial peptides help maintain the skin barrier in multiple ways. They kill bacteria, prevent moisture loss, and improve resilience.
And remember, they also increase the production of collagen and elastin—two proteins vital for structural integrity. The better your defenses, the better your skin health.
Improve Elasticity and Hydration
That smooth, supple look starts with proper moisture balance and a well-supported skin structure.
Signal and carrier peptides enhance hydration while reinforcing elasticity for a firmer, bouncier appearance.
Ease Inflammation and Redness
Skin that’s red and reactive needs balance. Antimicrobial and signal peptides have anti-inflammatory properties and hydration benefits to calm and soothe irritation.
This isn’t just placebo, either. Peptides can mimic the body’s natural molecules, signaling the cells to calm down. Neurotransmitter peptides in particular can actually help block physical reactions to irritants. It’s powerful stuff!
Support Wound Healing and Repair
Carrier and signal peptides also support wound healing and skin repair by encouraging the body’s natural renewal process.
That makes them especially helpful after procedures like microneedling, chemical peels, laser treatments, or even breakouts that leave the skin compromised and in need of extra support.
Reduce the Appearance of Fine Lines and Wrinkles
The anti-aging benefits of peptides are real. No, they’re not surgery-in-a-bottle, but they can create that lifted, smoother look over time.
As the skin’s structure weakens, wrinkles and expression lines begin to set in. Signal and neurotransmitter peptides help strengthen and support the skin, so those lines look softer and less defined.
Firm and Plump the Skin
When you support collagen and elastin, your skin looks firmer and more lifted. Signal and growth peptides reinforce the structure beneath the surface, creating that subtle, bouncy, well-rested look.
Think less sag, more snap.
Improve Skin Texture and Smoothness
Uneven texture usually comes back to weakened structure and slow turnover. Signal and enzyme inhibitor peptides help maintain collagen integrity.
That way, skin looks smoother, softer, and more refined over time.
Enhance the Effectiveness of Other Skincare Ingredients
Peptides help improve skin function overall, allowing it to respond more effectively to the rest of your routine.
Carrier and signal peptides support repair and resilience, making powerhouse ingredients like retinoids and antioxidants work even better.
How to Use Peptides in Skincare
Brow and Lash Serums
Peptides are great for your skin, but most people don’t realize they’re also powerful for your hair. They support keratin production and follicle health by helping create the ideal environment for stronger, healthier hair growth.
That means with a high-quality product like The Skinny Confidential Brow Peptides, your lashes and brows can grow stronger, thicker, and shinier. Plus, our Brow Peptides double as a sculpting and styling product!
Use them in your morning routine, evening routine, or for a mid-day touch-up. The combination of skin-friendly castor oil and powerful growth peptides nourishes, conditions, and supports fuller-looking brows and lashes while keeping them soft and flexible.
Anti-Aging Serums
There are so many anti-aging benefits to peptides. They help firm skin, smooth texture, improve structure, and defend against environmental stressors. All of that can help reduce the appearance of fine lines and wrinkles!
Apply peptide serums after cleansing but before moisturizer. Most formulas work well in the morning or evening and layer easily with the rest of your routine. With consistent use, they support that naturally lifted, smoother-looking finish.
Eye Creams
The under-eye area is delicate, thin, and usually the first place to show fine lines. Peptides are perfect here because they support collagen without being harsh or irritating. They help firm, smooth, and improve elasticity over time.
That means fewer creases and a more refreshed look. (Here’s more on how to make your eyes look less tired.)
Apply your peptide eye cream after serum and before moisturizer, gently tapping it around the orbital bone with your ring finger. With time, you’ll notice the area looks brighter, tighter, and more awake.
Moisturizers
Peptide-infused moisturizers deliver hydration while supporting long-term skin structure. As your final step, they help lock in active ingredients and keep your skin supported overnight.
Apply in the evening to seal everything in. They can help reinforce the skin barrier, support collagen, and maintain a firmer, smoother appearance by morning!
Peptides deserve a spot in everyone’s beauty routine.
At the end of the day, peptides aren’t just another trendy ingredient stamped across a label. They’re functional, versatile, and genuinely effective when you understand how to use them.
From firmer skin and smoother texture to stronger brows and fuller lashes, peptides work behind the scenes to support your skin’s natural structure and renewal process. They’re not hype. They’re smart science.
So the next time you see “peptides” on a product label, you’ll know exactly what that means and why it matters. And when you build them into your routine consistently, your skin, brows, and lashes will absolutely show it.
Want more high-quality beauty products packed with research-backed ingredients? Browse The Skinny Confidential Shop.
