Rationale #1 The Serum

Rationale The Serum No. 1 anti-aging face serum in dark glass bottle with black cap and gold label

Rationale The Serum number 1 lightweight white cream texture drop on light grey background

Rationale The Serum key ingredients Niacinamide Skin Soothing Actives and Intercellular Lipids for barrier repair and hydration

Rationale The Serum number 1 in 30ml and 15ml sizes with open dropper applicator on warm peach background

Rationale #1 The Serum

$125.00; $125.00
Unit price: per

1.0 fl. oz.

Product variants

or 4 interest-free payments of $31.25 with

Vendor: Rationale

Rationale #1 The Serum

$125.00

Size: 1.0 fl. oz. 1.0 fl. oz.

Product variants

PRODUCT OVERVIEW
FEATURES
HOW TO USE
INGREDIENTS
KEY INGREDIENTS
SHIPPING & RETURNS

PRODUCT OVERVIEW

A barrier-strengthening serum powered by Vitamin B Complex to visibly calm redness, support hydration, and restore skin resilience.

RATIONALE #1 The Serum is a lightweight daily treatment serum formulated to strengthen the skin barrier, calm visible redness, and deeply hydrate combination and sensitive skin types. Powered by a proprietary Vitamin B Complex, soothing actives, and skin-identical lipids, this nourishing formula helps improve skin resilience while promoting a smoother, more balanced, and healthier-looking complexion. Designed for daily morning use, it layers effortlessly beneath moisturizers and SPF.

Key Benefits

Helps visibly reduce redness
Strengthens the skin barrier
Deeply hydrates and replenishes
Supports healthier-looking, more resilient skin
Helps improve overall skin balance
Lightweight, fast-absorbing texture
Ideal for sensitive and combination skin types

FEATURES

Paraben-Free

Phthalate-Free

Sulfate-Free

HOW TO USE

Dispense 2–3 drops into palm.

Smooth gently over face, neck, décolletage and backs of hands.

INGREDIENTS

Rosa Damascena (Rose) Flower Water, Niacinamide, Glycerin, Pentylene Glycol, Aloe Barbadensis (Aloe Vera) Leaf Juice, Aqua (Water), Methylpropanediol, Coco-Caprylate/Caprate, Glyceryl Stearate Citrate, Cetearyl Alcohol, Caprylyl Glycol, Olive Oil Decyl Esters, Xanthan Gum, PEG-40 Hydrogenated Castor Oil, Trideceth-9, Hydrogenated Lecithin, Cetyl Alcohol, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Phenylpropanol, Santalum Spicatum (Sandalwood) Seed Oil, Citrus Aurantium Dulcis (Orange) Oil, Disodium EDTA, Glyceryl Caprylate, Squalene, Propylene Glycol, Butylene Glycol, Citrus Aurantium Bergamia (Bergamot) Fruit Oil, Citrus Grandis (Grapefruit) Peel Oil, Citrus Limon (Lemon) Peel Oil, Litsea Cubeba Fruit Oil, Citrus Aurantium Bergamia (Bergamot) Leaf Oil, Juniperus Mexicana Oil, Pelargonium Graveolens Oil, Citrus Aurantium Amara (Bitter Orange) Flower Oil, Eugenia Caryophyllus (Clove) Leaf Oil, Sodium Hyaluronate, Ascorbyl Glucoside, Collagen Amino Acids, Polysorbate 60, Sorbitan Isostearate, Citric Acid, Ceteareth-25, Potassium Sorbate, Magnesium Aspartate, Zinc Gluconate, Brachychiton Acerifolius Flower Extract, Sodium Benzoate, Leuconostoc/Radish Root Ferment Filtrate, Leuconostoc/Radish Root Ferment Lysate Filtrate, Phospholipids, Adenosine Triphosphate, Glycosphingolipids, Behenic Acid, Ceramide NP, Cholesterol, Copper Gluconate, Ethylhexylglycerin, Phenoxyethanol, Ceramide NS, Glycine, Tocopherol, Serine, Glutamic Acid, Ceramide AP, Ceramide EOP, Ceramide EOS, Banksia Serrata Flower Extract, Citrus Australasica Fruit Extract, Davidsonia Pruriens Fruit Extract, Hibiscus Sabdariffa Flower Extract, Melaleuca Alternifolia (Tea Tree) Leaf Extract, Santalum Acuminatum Fruit Extract, Tasmannia Lanceolata Fruit Extract, Telopea Speciosissima Flower/Leaf Extract, Terminalia Ferdinandiana Fruit Extract, Aspartic Acid, Leucine, Acetyl Octapeptide-3, Caprooyl Phytosphingosine, Caprooyl Sphingosine, Alanine, Lysine, Arginine, Tyrosine, Phenylalanine, Proline, Threonine, Valine, Isoleucine

KEY INGREDIENTS

The Primary Complex
A proprietary B-Group Vitamin Complex strengthens barrier function.

The Secondary Complex
A unique profile of Skin Soothing Actives delivers a calmer looking complexion.

The Delivery System
Water-based system that carries active ingredients into the skin.