If you’ve ever sipped on a collagen latte or popped a peptide-packed supplement hoping for better hair days, you’re not alone. Collagen, long praised for its skin-smoothing, glow-boosting benefits, is now emerging as a legit player in the hair health game too. But what does the science actually say about collagen and hair growth? Turns out — quite a lot.
Collagen 101: The Building Block of Healthy Hair
Collagen supplements are made of short chains of amino acids (called peptides) that your body absorbs and uses to build vital proteins like collagen, elastin, and keratin — the holy trinity for strong skin, nails, and yes, hair. Amino acids, especially ones like proline and hydroxyproline, play a direct role in producing keratin, the main protein in your hair strands.
So… Does Collagen Really Help Hair Grow?
Yes — and we now know more about why. A recent ex vivo study published in the Journal of Functional Foods dove into how collagen peptides affect human hair follicles. Researchers treated human scalp follicles with marine collagen, bovine collagen, and a placebo. The results? Both collagen types improved hair follicle strength, reduced hair shedding, and enhanced scalp health.
Here’s what makes this research especially exciting:
Marine collagen was found to prolong the hair’s anagen phase (aka the active growth phase).
Bovine collagen promoted hair follicle regeneration, which is key in reducing thinning and encouraging new growth.
Both types worked, but they used different biological pathways, likely due to differences in amino acid content and hydroxylation levels.
Why Amino Acids Matter
Not all protein is created equal. The type and structure of amino acids in a collagen supplement affects how it works in your body. That’s why hydroxyproline, proline, and other hair-supportive amino acids are critical. If your diet is lacking in these, a collagen supplement can help bridge the gap — especially if you’re not consistently consuming enough animal-based or marine protein sources.
The Bottom Line: Should You Add Collagen to Your Routine?
If hair loss, thinning, or scalp health are on your radar, collagen supplements could be a smart addition to your routine. Research shows they support follicle regeneration, prolong growth cycles, and improve scalp conditions — all of which lead to fuller, thicker, healthier hair over time.
While marine and bovine collagens both offer benefits, choosing the right one depends on your lifestyle and dietary preferences. Whichever route you choose, consistency is key — like with any supplement, give it at least 8–12 weeks to notice visible results.
In short? Collagen isn’t just for your skin anymore — it might be your hair’s new best friend.
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