Saturday Skin Scalp Strengthening Peptide Overnight Serum, 2.7 fl oz — 15‑Peptide with Caffeine & Niacinamide

Saturday Skin Scalp Hair Strengthening Peptide Overnight Serum is a lightweight leave-on treatment that works overnight to support scalp vitality and visibly strengthen hair for fuller-looking strands.

This overnight serum blends caffeine, a multi-peptide complex, niacinamide and salicylic acid into a non-greasy formula designed to refresh the scalp while fortifying hair from the roots. Formulated for daily nighttime use, it absorbs quickly and aims to improve the appearance of thinning or dry hair without heavy residue. Dermatologist-tested and free from parabens, sulfates, synthetic fragrances and artificial colors, it fits a clean-beauty routine and is compatible with most hair types.

How does this serum support a healthier scalp while you sleep?

The formula is designed for leave-on overnight action: caffeine and hop yeast help energize and nourish the scalp, while salicylic acid gently clarifies to maintain a balanced environment. Niacinamide works to reinforce the scalp barrier, helping reduce the feeling of dryness or imbalance. Together these ingredients focus on scalp clarity and comfort so hair can appear more vibrant over time.

• Caffeine and hop yeast provide nutrient support and a revitalizing effect.
• Salicylic acid helps exfoliate and clear product buildup for a cleaner scalp.
• Niacinamide strengthens the scalp’s natural barrier and balances moisture.

What makes the peptide complex important for hair strength?

Saturday Skin’s treatment contains a 15-peptide blend, including collagen and keratin components, formulated to improve hair elasticity and reinforce strand structure. Peptides are short amino acid chains that can help support the hair’s protein matrix, promoting a stronger feel and reduced breakage from styling or brushing. Regular nightly use aims to make hair look fuller and more resilient.

• 15-peptide complex targets hair elasticity and structural integrity.
• Collagen and keratin components help reinforce the hair fiber.
• Consistent use may reduce visible fragility and improve strand appearance.

How do I use this serum for best results?

Apply to a clean, dry or towel-dried scalp once a day, preferably at night. Shake the bottle, dispense a few drops onto the scalp, then gently massage to distribute the formula—no rinsing required. The lightweight texture absorbs quickly so it won’t weigh hair down or interfere with evening routines.

• Use on clean, dry or towel-dried scalp once daily, ideally overnight.
• Shake well, apply a few drops, and massage in; leave on—do not rinse.
• Works with all hair types and pairs with other styling or treatment products.

Is the formula safe and suitable for sensitive scalps?

The serum is dermatologist-tested and formulated without parabens, sulfates, synthetic fragrance and artificial color, aiming to be gentle while effective. It includes salicylic acid for mild exfoliation, so those with very reactive scalps should patch-test first. If irritation occurs, discontinue use and consult a professional.

• Dermatologist-tested and free from common irritants like sulfates and parabens.
• Contains salicylic acid—beneficial for cleansing but patch testing advised for sensitive skin.
• Designed to be lightweight and non-greasy for everyday use.

Who is this for: This overnight peptide serum is aimed at people noticing thinning, dryness, or fragility in their hair who want a lightweight, leave-on treatment to support scalp health and improve visible hair strength. It is suited to anyone seeking a clean, easy-to-use nightly routine—whether you have fine, medium or coarse strands—and works well alongside other haircare steps. If you have a medically diagnosed scalp condition, consult a dermatologist before adding new active treatments.

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.