Peptides in Haircare Explained: Molecular Weight and Scalp Penetration
Peptide serums promise thicker, healthier hair, but can these ingredients actually reach your hair follicles? This episode breaks down the science of molecular weight and scalp penetration to reveal why most peptide haircare products can't deliver on their claims. Dr. Elena Voss explains the crucial difference between peptides that might influence hair growth and those that simply coat the surface. If you've ever wondered whether that expensive peptide serum is worth it, this is your reality check.
Key Takeaways
- Most peptides are too big to penetrate your scalp. Think of your skin like a security gate that only lets small packages through. Scientists call this the 500-Dalton rule, and many popular peptides are simply too large to pass through without special delivery systems that most products don't include.
- Your hair shaft is dead and can't respond to peptides. The visible part of your hair is made of dead protein, like your fingernails. It has no living cells to receive peptide signals, so any peptide applied to hair strands can only coat the surface temporarily rather than repair it from within.
- Copper peptides are one of the few that might actually work. GHK-Cu is small enough to potentially reach hair follicles, and some studies show it can extend the growth phase of hair. It's like a delivery truck that's actually small enough to fit through the gate.
- How a peptide is packaged matters as much as the peptide itself. Wrapping peptides in tiny fat bubbles called liposomes can help them penetrate deeper, but most haircare brands don't reveal whether they use this technology or just mix peptides into regular formulas.
- There's a big difference between scalp peptides and hair-coating peptides. Scalp-targeted peptides aim to influence living follicle cells and potentially affect hair growth. Hair-shaft peptides are basically fancy conditioners that smooth the surface temporarily. Brands often blur this line in their marketing.
Show Links
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Ordinary Multi-Peptide Serum for Hair Density
Skin Actives Copper Peptide Serum
Hask Keratin Protein Smoothing Shampoo
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