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Obagi Nu-Cil BioStim Scalp SerumBuy it
✱ Best Overall

Obagi Nu-Cil BioStim Scalp Serum

9.6/10Verdict Lab Score · Buy it
#1 of 10 in Best hair growth serums in 2026 ↗
Best forOverall thinning and reduced density
DrawbackAt around $125, considerably more expensive than most cosmetic hair serums.
Key ingredientsPeptides, biotin, amino acids
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✱ The verdict

Why it scores
9.6 out of 10

Obagi Nu-Cil BioStim takes the top spot for pairing a sophisticated scalp-focused formula with unusually strong brand-provided clinical testing.

Its BioStim Complex contains biotin, amino acids, biotinoyl tripeptide-1, B vitamins and phytoactives designed to support scalp health and stronger-looking hair.

Obagi reports a 97% reduction in dry fallen hair and a 74% increase in scalp hydration after 24 weeks in 2025 testing. These results are brand-sponsored and individual outcomes vary.

Why we ranked it #1
↗Advanced peptide-based scalp formula
↗Includes biotinoyl tripeptide-1
↗Strong focus on scalp health
↗24-week clinical testing
↗Supports density, hydration and less breakage
↗Lightweight leave-in format

How it compares
hair growth serums

Full ranking ↗
RankProductBest forKey ingredientsScore
01Obagi Nu-Cil BioStim Scalp SerumBest OverallPeptides, biotin, amino acids9.6
02Briogeo Destined for Density MegaStrength+ Peptide Density SerumDensityCopper peptides, caffeine, niacinamide9.5
03VEGAMOUR GRO Hair SerumEarly ThinningPeptides, caffeine, red clover9.3
04The Ordinary Multi-Peptide Serum for Hair DensityBest ValuePeptides, caffeine, Procapil, Redensyl9.2
05Nutrafol Hair SerumFine HairAshwagandha technology, pea sprouts9.0
06Act+Acre Stem Cell Scalp SerumScalp HealthPlant stem-cell complex8.9
07Kérastase Genesis Serum FortifiantBreakageStrengthening complex8.8
08KeraFactor Scalp Stimulating SolutionPremium TechnologyGrowth factors, peptides8.7
09Mielle Rosemary Mint Scalp & Hair Strengthening OilBudget BotanicalRosemary, peppermint, oils8.5
10Briogeo Scalp Revival Charcoal + Tea Tree Scalp TreatmentSensitive ScalpCharcoal, tea tree, aloe8.3

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