If you read my first peptide post, you already know my secret: I love peptides. Seriously, love them. So when someone asks me whether peptides are worth adding to a routine after 40, I answer before they finish the question. Yes. And I can give you five good reasons.
The short answer: Peptides are short chains of amino acids that act as messengers, signaling skin to behave the way it did more readily when we were younger. After 40, skin makes less collagen and elastin and renews itself more slowly. Peptides speak directly to that biology. They can take on many different jobs, they work well alongside other actives, and they are generally gentle on skin. Each reason is worth a closer look.
1. Why do peptides work so well for skin over 40?
Peptides support the processes that slow down as skin matures. After 40, collagen and elastin production declines, cell turnover takes longer, and the barrier tends to run drier. Your skin still knows how to do its job, and it responds beautifully to clear instructions.
Peptides are built from the same amino acids that make up collagen and elastin, and they are small enough to work into the outer layers of skin. Once there, they act as tiny messengers, supporting the pathways that increase collagen and elastin. The peptides we use are biomimetic, meaning they mirror peptides your skin already makes, so your skin recognizes them and responds. That's why peptides for aging skin have earned such a central place in skincare over 40.
2. How can one type of ingredient do so many different things?
Each peptide carries its own specific message, so different peptides can target different signs of aging. This is what makes them so interesting to a chemist. The same family of molecules gives us insulin and GLP-1 therapies in medicine, and in skincare it can firm, smooth, even tone and soften expression lines, depending on the sequence.
That's why I built the Pentapeptide Matrix™ around five peptides rather than one. One signals skin to firm and lift. One targets the signals behind sagging. A growth factor peptide encourages fresh, healthy cells for a more even tone. One sends calming signals that help skin relax and lift along the jawline. The fifth softens the muscle signals behind expression lines. In ingredient-level studies, the peptides in our matrix showed a 28% increase in forehead lifting and a 31% reduction in wrinkle volume. Those figures come from published and supplier research on the individual peptides.
3. Can you use peptides with retinol and your other actives?
Yes. Peptides layer easily with most of the ingredients you probably already love. Retinol, niacinamide, hyaluronic acid and antioxidants can all share a routine with peptides. I'm a big believer in prescription retinol after 40, and peptides make a wonderful partner to it.
Pairing also helps peptides perform. In our formulas, the matrix is supported by niacinamide to keep the barrier healthy so peptides can absorb and do their work, ATP for cellular energy, and botanical flavonoids that shield against oxidative stress. Good chemistry is about the company an ingredient keeps.
4. Are peptides gentle enough for everyday use?
Peptides are generally well tolerated, so most women can use them morning and night. They don't depend on irritation to deliver results, which means you skip the redness and peeling phase that comes with some stronger actives. That matters after 40, when skin tends to be drier and more reactive than it used to be. As with anything new, a patch test is always a smart first step.
5. Is the science behind peptides really proven?
Yes. Peptides are among the most studied molecules in both medicine and skincare, and the field keeps moving forward. Peptides have been used in medicine for decades, and peptide skincare is backed by years of published research on how specific sequences affect firmness, wrinkles and tone. That is a long record of evidence, and it is still growing.
The advancing part is what thrills me as a chemist. Through peptide synthesis, we build peptides amino acid by amino acid, which makes them more stable, more targeted and more consistent than anything extracted from nature. Each new generation of sequences is more precise than the last. When I say Sherak is biotechnology-based skincare, this is exactly what I mean: we choose ingredients with real evidence behind them and follow the science as it advances.
What's the best skincare routine for your 40s?
A strong routine after 40 has three jobs: cleanse without stripping, treat with peptides, and protect the barrier. Add a daily broad-spectrum SPF in the morning and, if you use one, your retinol at night.
That thinking is the foundation of the Sherak System, our three-step routine created for women over 40. The Free Radical Neutralizing Oil cleanses with a blend of 14 antioxidant plant and vitamin oils, leaving skin soft rather than stripped. The Reactivation Serum and Barrier Shield Moisturizer both carry the Pentapeptide Matrix™, so peptides are working on your skin morning and night. To me, luxury skincare means every step earns its place on your vanity, and every one of these does.
And I'd love to hear from you. Some of my favorite conversations happen when women compare notes on what's working for their skin, so come join us on Instagram @sherakskin and tell me how peptides fit into your routine.
Five reasons, one conclusion: skin over 40 deserves to be well formulated.
Warmly,
Jen
Frequently Asked Questions
What do peptides do for aging skin?
Peptides act as messengers that support the pathways that increase collagen and elastin, helping skin look firmer, smoother and more even as natural production slows with age.
Can you use peptides and retinol together?
Yes. Peptides and retinol work well together, and the combination is a strong foundation for skincare over 40.
Are peptides good for sensitive skin?
Peptides are generally well tolerated and don't rely on irritation to work, which makes them a good fit for drier or more reactive skin. Patch test any new product first.
What's the difference between peptides and collagen?
Collagen is a large protein. Peptides are short chains of amino acids, small enough to work into the outer layers of skin and signal it to support its own collagen pathways.
How long do peptides take to show results?
Peptides work gradually- and no skincare works miracles overnight. Many ingredient studies measure results at four weeks and beyond, so consistent morning and evening use matters most.