| Product page | View product→ | View product→ | View product→ | View product→ |
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| Category | Scalp tonic | Scalp ampoule | Scalp serum | Scalp treatment |
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| Routine role | Treatment | Treatment | Treatment | Treatment |
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| Best for | oily or uncomfortable-feeling scalp conversations; a spray-on leave-on rather than a wash | leave-on scalp ampoule users who want a brush applicator; caffeine/menthol scalp conversations | readers comparing brush scalp ampoules with PDRN letters; centella + caffeine scalp leave-ons | buildup-prone or oily-feeling scalp conversations; a rinse-off pre-shampoo treatment rather than a leave-on serum |
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| Skin types | Not listed | Not listed | Not listed | Not listed |
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| Concerns | Not listed | Not listed | Not listed | Not listed |
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| Texture | Watery | Serum | Serum | Watery |
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| Key ingredients | BHA, Alcohol Denat., tea tree essential oil, tea tree extract, salicylic acid (BHA), peppermint oil, eucalyptus leaf oil, caffeine | Alcohol Denat., caffeine, menthol, Sodium DNA, biotin, peptides, tea tree leaf extract, brush applicator | Centella, Niacinamide, Ceramides, Alcohol Denat., silica, caffeine, Sodium DNA, peptides, brush applicator | tea tree extract, black willow bark (natural BHA), salicylic acid (BHA), hyaluronic acid, precision nozzle |
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| Beginner friendly | Better after a simple core routine | Better after a simple core routine | Better after a simple core routine | Better after a simple core routine |
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| Fragrance | Not confirmed in our available product information. | Not confirmed in our available product information. | Not confirmed in our available product information. | Not confirmed in our available product information. |
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| Essential oils | Listed | Not listed on the INCI used for this record | Not listed on the INCI used for this record | Not confirmed in our available product information. |
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| Drying alcohol | Listed | Listed | Listed | Not confirmed in our available product information. |
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| Labeled SPF | Not listed | Not listed | Not listed | Not listed |
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| Editorial notes | Not beginner-friendly as a first scalp active. Not part of a short face routine. | Not a medical hair-loss treatment. Confirm applicator type on the unit you buy. | Not beginner scalp care. Not a face reedle shot. See /ingredients/pdrn for letter limits. | Not beginner-friendly as a first scalp active, and not part of a short face routine. Not a dandruff, psoriasis, or hair-loss treatment. |
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