Peptides vs Botanicals for Hair Loss.
What Does the Science Say?
Peptides are becoming popular in hair serums. Many products claim they can “signal hair follicles to grow”.
It sounds convincing. But when we look at how most hair loss actually works, the picture becomes clearer.
The most common type of hair thinning is androgenetic hair loss, where follicles become sensitive to DHT (dihydrotestosterone). Over time the follicle gradually shrinks, hair becomes thinner, and the growth phase becomes shorter. This process is called follicle miniaturisation.
Because of this, ingredients that influence hormonal pathways, scalp inflammation, or the follicle environment tend to make more biological sense.
Peptides
Peptides are small chains of amino acids that act as cell messengers.
In laboratory studies they can influence cells around the hair follicle and support the surrounding tissue environment. This is why peptides are widely used in skincare.
However, most peptides used in cosmetic hair products do not directly affect DHT activity, which is one of the main drivers of pattern hair thinning.
Another important factor is delivery.
Many peptide serums are water-based formulations. Water requires preservatives and stabilisers, and peptides can be fragile molecules that degrade when exposed to oxygen, light or unstable formulas.
If a peptide breaks down before reaching the follicle, it loses the signalling structure that gives it its function. While small fragments may still provide minor surface conditioning to the scalp, they no longer influence the biological processes involved in hair thinning.
For this reason, peptides may support the scalp environment to some extent, but they are not currently considered a primary approach to androgen-related hair loss.
Botanicals
Some botanical ingredients have been studied for their ability to interact more closely with pathways involved in hair thinning or scalp health.
Saw palmetto has been studied for its ability to reduce activity of the enzyme involved in DHT production.
Rosemary oil showed improvements in hair count in a clinical study comparing it with 2% minoxidil after six months.
Black caraway (Nigella sativa) has been studied in people with telogen effluvium. In one clinical study, a lotion containing black seed oil improved hair density and reduced scalp inflammation after three months. Its active compound, thymoquinone, is known for anti-inflammatory and antioxidant effects.
Nettle contains plant compounds that may interact with androgen pathways and help calm scalp inflammation around follicles.
Onion extract has demonstrated hair regrowth effects in studies on alopecia areata, an autoimmune form of hair loss.
While research on botanicals continues to evolve, these ingredients often target mechanisms more closely linked to scalp health and hair shedding.
Why the Delivery System Matters?
Hair treatments are not only about what ingredient is used, but also how it is delivered.
Many hair serums are mostly water. Water-based formulas require preservatives and can dilute active ingredients.
Botanical oils behave differently.
Oil-based formulations can remain on the scalp longer and interact more directly with the follicle environment. Plant oils also naturally dissolve many of the active compounds found in botanicals, helping deliver them in a more stable form.
This means the formulation itself can influence how effectively ingredients reach the scalp.
A Simpler Way to Think About It
Peptides may help support the scalp environment.
Botanical ingredients such as rosemary, saw palmetto, nettle and black caraway may help interact with pathways involved in hair thinning and scalp inflammation.
Understanding this difference helps separate ingredient trends from biological mechanisms.
At Ellà Viè, the focus is simple: support the follicle environment with carefully selected botanicals in a waterless formulation designed for scalp health.
Because healthy hair doesn’t start with the strand.
It begins with the scalp.
Thank you for reading xoxo