ULULIS Premium Black Serum Hair Oil Review:
Is the PDRN Formula Worth It?
The ULULIS Premium Water Conc. Black Serum Hair Oil arrived quietly in Japanese drugstores in early 2026 — no celebrity campaign, no major Western press. What it did have was a formula that looked genuinely different from anything in the standard J-beauty hair oil space: PDRN, exosomes, Tosurea, and 10× concentrated collagen water, all in a lightweight oil that absorbs without residue. Two orders came in through our store before we'd even written a word about it. That was reason enough to look closer.
ULULIS Premium Water Conc. Black Serum Hair Oil 100ml
Japan-domestic formula. Sourced fresh from Matsumotokiyoshi. 95%+ moisture and repair actives.
View on TokyoShelf →What is the ULULIS Black Serum Hair Oil?
ULULIS is a hair care brand by NatureLab — a Japanese cosmetics company known for formulating with high water-soluble ingredient concentrations rather than silicone-heavy bases. Their signature concept is "Water Conc": more than 90% of each formula is composed of moisture and repair actives rather than fillers. The Premium Black Serum is the newest and most advanced line in the range.
Where the standard ULULIS oils focus on daily hydration, the Black Serum line targets structural repair — specifically the kind of damage caused by bleaching, perming, heat styling, and ageing that changes the actual texture and behaviour of hair. The "black" in the name refers to the Black Serum Water Complex at its core: fermented black rice, black soy peptide, and black pearl protein, each chosen for resilience-building properties.
ULULIS Premium Black Serum Hair Oil
Key Ingredients — What PDRN Actually Does
Most hair oils either coat the surface (silicone-based) or add moisture to the outside of the hair shaft (standard oil-based). The Black Serum formula does something different: it includes actives originally developed for aesthetic medicine that work at a deeper structural level.
Texture, Scent & Application
The oil is viscous but not heavy — it has a slightly serum-like quality that spreads easily without slip. On application it feels almost water-like in how quickly it absorbs. There is no residue visible or tactile after blow-drying with 2 pumps on medium-length hair.
| Property | Description | Vs. Standard ULULIS Oil |
|---|---|---|
| Texture | Viscous serum-oil hybrid, absorbs fast | Slightly thicker, more concentrated feel |
| Finish | Silk + subtle gloss — not wet-look | More repair-focused, less pure shine |
| Scent | Black Fleur — dark florals, subtle earthiness | Distinctly different, more sophisticated |
| Scent longevity | Light after drying, not overpowering | Similar longevity |
| Recommended amount | 2 pumps (mid-length), 3+ pumps (long/thick) | Same dosage logic |
| Residue | None if applied correctly | Same — both are non-greasy when dosed right |
Results: What to Expect (and When)
| Timeframe | What You'll Notice | Driven By |
|---|---|---|
| First use | Noticeably softer post-blowdry; ragged ends look smoother | Keratin + collagen water surface action |
| 3–5 days | Frizz stays controlled in humidity; finger-combing becomes easier | Tosurea bonding inside the hair shaft |
| 2–3 weeks | Hair holds moisture better between washes; less static | PDRN cellular hydration; exosome barrier support |
| 4+ weeks | Texture feels rebuilt rather than just coated; less breakage | Cumulative structural repair from Black Serum complex |
The cumulative effect is the key point. Unlike a silicone oil where results plateau immediately, the repair actives in the Black Serum build over time. Users on @cosme and Japanese beauty forums consistently note that the hair feels different — not just better-looking — after sustained use.
Category Ratings
How to Use It Correctly
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Towel-dry first After washing, squeeze out excess water. Hair should be damp — not dripping. Water dilutes the oil and prevents proper absorption.
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Dispense 2–3 pumps into your palm. Add 1 extra pump for long or very thick hair.
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Apply mid-lengths to ends first, then work upward. Avoid the scalp — the oil is formulated for the hair shaft, not the skin surface.
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Comb through with a wide-tooth comb to distribute evenly before heat is applied.
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Blow-dry or air-dry as usual. For air-drying, results may appear slightly different in texture — both methods work well.
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Pro tip: For heavily bleached or very damaged hair, apply, detangle, then wait 2–3 minutes before blow-drying. The extra dwell time allows PDRN and Tosurea to begin absorbing before heat closes the cuticle.
Verdict — Who Should Buy It?
✓ Buy It If
- Hair is bleached, coloured, or permed
- Frizz persists despite regular conditioning
- Hair has changed texture over time
- You want repair, not just surface coating
- Fine to medium hair that can't take heavy silicone
- You've used standard oils and still have dry ends
→ Consider Instead
- Just want daily moisture → Standard ULULIS Aqua line
- Very coarse or thick natural hair → &honey Deep Moist Oil
- Budget-first priority → ULULIS Moist or Kirameki
- Scalp treatment needed → Different product category
The Black Serum Hair Oil earns its premium positioning. PDRN in hair care is still rare — the ingredient costs more to formulate with, which is why it appears in aesthetic treatments and high-end skincare before hair products. The fact that ULULIS has brought it to a ¥3,000-range drugstore product, combined with Tosurea and the 10× keratin and collagen concentration, makes this formula legitimately different from anything else at this price point.
It won't fix catastrophically damaged hair in one use — nothing will. But with consistent use, the structural repair compounds do accumulate, and the difference in how the hair behaves (not just looks) after several weeks is the clearest evidence that something more than surface conditioning is happening.
ULULIS Premium Water Conc. Black Serum Hair Oil 100ml
Japan-domestic formula. Sourced fresh from Matsumotokiyoshi, Tokyo. Ships direct from Japan.
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