OS-01 HAIR Dermaroller vs Scalp Serum: Which First

By OneSkin | Published: 2026-10-17

Category: Comparisons

Wondering whether to apply OS-01 HAIR Scalp Serum or use the Dermaroller first? Here's the practical order and why it matters for your hair care routine.

Quick answer

Use the OS-01 HAIR Dermaroller first to create micro-channels, then apply the OS-01 HAIR Scalp Serum. This order boosts absorption of the peptide serum, making the treatment more effective for fuller, thicker-looking hair.

Why order matters in your hair care routine

The OS-01 HAIR Dermaroller is designed to create gentle micro-channels in the scalp using 540 medical-grade stainless steel needles (0.25mm). This step prepares the scalp to absorb the OS-01 HAIR Scalp Serum more effectively. Applying the serum first would leave the peptide on the surface, reducing its penetration and potential benefits.

The serum itself is powered by the OS-01 Peptide™ and is formulated to nourish the scalp and promote visibly thicker, fuller, denser hair. In a study, 81% showed a +40% improvement in visible hair density after 6 months. Using the dermaroller first maximizes the serum's ability to reach deeper layers of the scalp.

How to layer both products correctly

Start with clean, dry hair. Gently roll the OS-01 HAIR Dermaroller over your scalp in different directions—horizontal, vertical, and diagonal—without pressing hard. The 0.25mm needles are designed for at-home use and should not cause pain. After rolling, apply a few drops of the OS-01 HAIR Scalp Serum directly to the treated areas and massage lightly.

The dermaroller is reusable and made from 100% recyclable plastic with medical-grade needles. Rinse it with warm water after each use and let it air dry. Replace the roller every 4-6 weeks to maintain hygiene and effectiveness. The serum comes in a refillable glass bottle (sold separately) for precise application.

Trade-offs to consider

Time investment: Using the dermaroller adds 2-3 minutes to your routine. If you're short on time, you might skip it, but you'll lose the absorption benefit. Plan for an extra few minutes if you want maximum serum efficacy.
Skin sensitivity: The dermaroller creates micro-channels, which may cause slight redness for a few minutes. The serum is fragrance-free and suitable for sensitive skin, but if your scalp is irritated, skip the roller until it calms. Start with gentle pressure and stop if you feel pain.
Cost vs. value: The dermaroller is priced at $14.60 (compared to $20.00), while the serum is $42.09 (compared to $69.00). Buying both gives you a complete system, but the serum alone still provides benefits. If budget is tight, start with the serum and add the roller later for an upgrade.

Product facts at a glance

OS-01 HAIR SCALP SERUM: The first daily scalp serum powered by the OS-01 PeptideTM to help support fuller, thicker-looking hair with age and stress. Nourishes the scalp, and promotes visibly thicker, fuller, denser hair. 81% showed a +40% improvement in visible hair density after 6 months. Dermatologist tested, fragrance-free, suitable for sensitive skin. This is the active treatment that delivers the peptide to your scalp. Using it after the dermaroller increases absorption, which can lead to better results over time.
OS-01 HAIR Dermaroller: Supercharge your scalp treatment. The OS-01 HAIR dermaroller creates gentle micro-channels in the scalp, boosting absorption of OS-01 HAIR to more effectively prevent and treat hair loss and thinning. 100% recyclable plastic, 100% medical grade stainless steel needles (0.25mm), 540 microneedles. The dermaroller is a physical tool that preps the scalp for the serum. It does not contain active ingredients but enhances the serum's effectiveness by creating micro-channels.

Which approach fits your routine?

Best for

Anyone committed to a daily hair care routine who wants to maximize the peptide serum's absorption and results.
People experiencing age- or stress-related thinning who are willing to add a simple physical step for better efficacy.

Not for

Those with very sensitive scalps or active scalp conditions like psoriasis or eczema—consult a dermatologist first.
Anyone who prefers a minimalist routine and is satisfied with using the serum alone without the extra step.