Last Updated on April 18, 2025 by Giorgia Guazzarotti
Ugh. Stretch marks. No matter what I do, they never seem to go away. I’ve learned to accept them as part of my body. I don’t hesitate to wear a bikini anymore. Let the world see them, I just want to have some fun.
But I’d be lying if I said I’m not hoping for someone to come up with a cure for stretch marks that really works.
Helix BioMedix Inc did just that. This company made a peptide called Heptapeptide-7 that promises to rid you of stretch marks. Is it too good to be true? Let’s see what the science says:
What’s Heptapeptide-7?
First, quick refresher: peptides are tiny chains of amino acids. Basically little messengers your skin uses to communicate. They tell your skin to produce more collagen, hold onto moisture, or start healing when there’s damage. Some are naturally made by your body, others are cooked up in labs to mimic those same signals and give your skin a bit of a nudge.
Hexapeptide-7 is a synthetic peptide made up of seven aminoacids, including asparagine, glycine, arginine, and isoleucine. It’s specifically designed to mimic the “natural sequences found as part of the body’s own defense and repair system.“
In other words, if you can recreate the mechanism the body uses to repair itself, you can fix stretch marks, right?
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What Actually Are Stretch Marks?
Before we throw more science at this, let’s quickly talk about what we’re even dealing with here. Stretch marks, aka striae, happen when your skin stretches or shrinks too fast. Think pregnancy, puberty, weight gain, muscle growth. Basically, anything that makes your skin go, “Wait, we’re doing what now?”
That sudden stretch messes with the collagen and elastin (the two proteins that keep your skin smooth and snappy). Once they break or tear, your skin tries to heal… and that healing process leaves behind these scar-like lines. At first they’re red or purple (that’s inflammation), and then they fade into silvery-white stripes.
And just to be clear: no lotion, oil, or serum can magically erase them overnight. Anyone telling you otherwise is selling snake oil with a side of false hope.
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How Do Peptides Work On Skin Anyway?
This part’s pretty cool. Peptides are like little messengers that tell your skin what to do. Some peptides tell your skin to produce more collagen. Others tell it to stay hydrated. Some even tell it to calm down when it’s freaking out from inflammation.
With Heptapeptide-7, the goal is to mimic the signals that tell your skin, “Hey, it’s time to repair the damage and make some fresh collagen.” Collagen is what gives your skin structure and bounce, so more collagen = potentially fewer stretch marks.
But again, the keyword here is potentially. Remember that most studies praising peptides come from the manufacturers…. Just because a peptide helps with collagen doesn’t automatically mean it’ll erase your tiger stripes.
Related: The Truth About Peptides In Skincare: Do They Really Work?
What Does Heptapeptide-7 Do?
Helix BioMedix Inc swear Heptapeptide-7 is a godsend for mature skin. A 2010 study Helix BioMedix Inc did on 32 50-something women found that Heptapeptide-7 stimulated keratinocyte proliferation and migration and induced collagen synthesis. This reduced wrinkles on the forehead and improved the texture of the skin. How?
Keratinocytes are the predominant type of cell on the surface of your skin. Their job is to create a protective barrier against heat, bacteria, water loss, UV rays and other enemies of the skin.
Keranocytes play a role in wound healing, too. When skin is hurt, they travel to the wounded area and fill in the gaps. In then same way, they can fill in fine lines and wrinkles, making them look smaller. But this effect is only temporary.
Boosting collagen, on the other hand, prevents new wrinkles and sagginess. Plus, it’s supposed to reduce stretch marks as well. But, I couldn’t find any independent studies claiming Heptatapeptide-7 reduces stretch marks. Only Apothederm, a company owned by Helix BioMedix, makes this claim.
Me thinks I’ll be waiting for an independent source to confirm this before I invest in this peptide.
Are There Any Side Effects?
For your skin, not your wallet. We already saw this stuff may not work…
Peptides are generally considered safe in skincare. Your body naturally uses them, so when a topical peptide like Heptapeptide-7 shows up, your skin’s like, “Cool, we know what to do with this.”
That said, with any ingredient there’s always the potential for irritation. Heck, some people are allergic to water, know what I mean? It’s extremely rare to experience side effects like redness, stinging, or a mild rash, just not impossible.
So if you’re trying Heptapeptide-7 for the first time, patch test it like a cautious skincare nerd. Inner arm, 24 hours, thank me later.
Who Should (and Shouldn’t) Use It?
If you’ve got mature skin, dry skin, or your stretch marks are still in the early pink/purple stages, Heptapeptide-7 might be worth a shot. The idea is to catch your skin while it’s still in “repair mode” and nudge it in the right direction with extra collagen support.
On the flip side, if your stretch marks are older (aka white and fully settled), no peptide on this planet is going to erase them overnight. You’d probably get more dramatic results from something like microneedling or fractional laser, which work way deeper in the skin.
Also worth mentioning: if you’re pregnant or breastfeeding, always double-check with a derm. Peptides aren’t a big red flag like retinoids, but there’s still not a ton of safety data for pregnant folks specifically using Heptapeptide-7.
Related: Microneedling: Does It Help Or Hurt Skin?
The Bottom Line
Heptapeptide-7 is a new promising ingredient that could help in the fight against wrinkles and stretch marks. That’s what the manufacturer says anyway. I’m waiting for independent studies to confirm this before slathering it all over my stretch marks.