Saturday Skin Scalp Hair Growth Serum – Overnight Peptide Thinning Treatment, Caffeine & Salicylic Acid

Saturday Skin Scalp Hair Growth Serum is a lightweight overnight scalp treatment formulated with caffeine, a 15-peptide complex, niacinamide, and salicylic acid to help strengthen follicles and support fuller-looking hair.

This leave-on serum is designed to be used nightly on a clean, dry or towel-dried scalp. It combines targeted actives to clarify the scalp, reinforce hair structure, and promote the appearance of denser strands without adding weight or greasiness. The formula is dermatologist-tested and free from parabens, sulfates, synthetic fragrance, and artificial color, making it suitable for a variety of hair types and routines.

How does this serum help improve thinning hair overnight?

The serum works as an overnight support treatment: caffeine energizes the scalp while peptides and growth-supporting ingredients focus on hair elasticity and strength. Salicylic acid gently clarifies, helping follicles breathe and promoting a healthier scalp environment that complements the fortifying actives.

• Caffeine to stimulate the scalp and encourage follicle activity.
• 15-peptide complex including collagen and keratin components for structural support.
• Niacinamide to balance and strengthen the scalp barrier.
• Salicylic acid to exfoliate and reduce build-up that can impede hair health.

What is the application routine and how often should I use it?

Use the serum once daily, ideally at night for overnight absorption. Apply a few drops to a clean, dry or towel-dried scalp, massage gently to distribute, and leave it on—no rinsing required. Consistent nightly use gives the ingredients time to support scalp clarity and hair resilience.

• Shake well before dispensing to mix actives evenly.
• Target sparse areas and massage to boost circulation.
• Leave on overnight; wash hair as usual in the morning if desired.

Will this weigh my hair down or feel greasy?

No — the formula is lightweight, fast-absorbing, and non-greasy, formulated to deliver a cooling sensation without buildup. It’s intended to nourish and hydrate the scalp and strands while remaining virtually undetectable in the morning, suitable for thin to thick hair textures.

• Fast absorption prevents residue on roots.
• Cooling feel to refresh and invigorate the scalp.
• Designed to enhance hair density appearance without heaviness.

What ingredients should I expect and are there any irritants?

The serum blends caffeine, niacinamide, a multi-peptide complex, hop yeast nutrients, and a small amount of salicylic acid for scalp clarity. It is dermatologist-tested and free from parabens, sulfates, synthetic fragrance, and artificial color; however, those sensitive to salicylic acid or active treatments should patch-test first.

• Key actives: caffeine, niacinamide, 15-peptide complex, hop yeast.
• Scalp clarifier: salicylic acid at a formulation level to reduce buildup.
• Free from parabens, sulfates, synthetic fragrance, and artificial color.

Who is this for? This serum is aimed at anyone looking to support the appearance of thicker, healthier hair and a clearer scalp—especially people noticing early thinning, reduced volume, or dry, dull roots. It suits all hair types and those seeking a simple, leave-on overnight step that layers easily with other haircare products and fits into existing evening routines.

Ingredients

WATER/AQUA/EAU, BUTYLENE GLYCOL, NIACINAMIDE, OCTYLDODECETH-16, POLYSORBATE 20, TROMETHAMINE, ACRYLATES/C10-30 ALKYL ACRYLATE CROSSPOLYMER, MENTHOL, SODIUM BENZOATE, SALICYLIC ACID, CAFFEINE, CHLORELLA VULGARIS EXTRACT, GLUCOSE, PANTHENOL, POTASSIUM SORBATE, FRUCTOOLIGOSACCHARIDES, FRUCTOSE, GLYCERIN, 1,2-HEXANEDIOL, MENTHYL PCA, ETHYL MENTHANE CARBOXAMIDE, GLYCINE SOJA (SOYBEAN) SEED EXTRACT, CAPRYLIC/CAPRIC TRIGLYCERIDE, PROPYLHEPTYL CAPRYLATE, HYDROGENATED LECITHIN, PENTYLENE GLYCOL, PROPANEDIOL, COCOGLYCERIDES, PHENYL TRIMETHICONE, CYNANCHUM ATRATUM EXTRACT, OCTANEDIOL, ETHYLHEXYLGLYCERIN, CAPRYLYL GLYCOL, ALTHAEA ROSEA FLOWER EXTRACT, DIPOTASSIUM GLYCYRRHIZATE, SACCHAROMYCES CEREVISIAE EXTRACT, SERINE, GLUTAMIC ACID, ASPARTIC ACID, CERAMIDE NP, CHOLESTEROL, STEARIC ACID, LEUCINE, SH-OLIGOPEPTIDE-1, SH-POLYPEPTIDE-1, SPHINGANINE, PHOSPHATIDYLCHOLINE, ALANINE, LYSINE, ARGININE, TYROSINE, PHENYLALANINE, PROLINE, THREONINE, VALINE, ISOLEUCINE, POLYGLYCERYL-10 LAURATE, HISTIDINE, CYSTEINE, METHIONINE, GLYCINE, ACETYL HEXAPEPTIDE-8, COPPER TRIPEPTIDE-1, PALMITOYL PENTAPEPTIDE-4, TRIPEPTIDE-1, ALANINE/HISTIDINE/LYSINE POLYPEPTIDE COPPER HCL, HEXAPEPTIDE-9, PALMITOYL TRIPEPTIDE-1, SH-OLIGOPEPTIDE-14, SH-OLIGOPEPTIDE-2, SH-POLYPEPTIDE-45, SH-POLYPEPTIDE-7, SH-POLYPEPTIDE-9.