Hyaluronic Acid Skincare Products

Hyaluronic Acid

Deeply hydrate and plump with Hyaluronic Acid—binding moisture to the skin for enhanced suppleness, elasticity, and long-lasting hydration.

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The Radiance Booster Serum

$176.00

Suited to

["All skin"]

#1 The Hydragel

$244.00

Frequently Asked Questions

What is Hyaluronic Acid?

Hyaluronic Acid is a humectant naturally found within the skin and connective tissues. It has a remarkable capacity to attract and hold up to one thousand times its weight in water, making it one of the most effective hydrating actives in skincare. Within RATIONALE formulations, it works to plump, hydrate, and visibly smooth the complexion across both AM and PM rituals.

What does Hyaluronic Acid do for skin?

Hyaluronic Acid attracts and binds water within the skin, providing immediate and sustained hydration. It works to plump the look of fine lines, refine the appearance of texture, and restore a luminous, well-hydrated complexion. Multi-molecular weight Hyaluronic Acid in our formulations delivers hydration at varying depths within the skin for comprehensive results.

Which RATIONALE formulations contain Hyaluronic Acid?

Hyaluronic Acid features across multiple formulations, with particular concentration in The Radiance Booster Serum, and also features in #1 The Strengthening Serum, #1 The Strengthening Hydragel, #4 The Nourishing Eye Crème, Beautiful Skin Superfluid and our Beautiful Balms. Our Skin Questionnaire can guide your selection based on hydration needs.

Is Hyaluronic Acid suitable for all skin types?

Yes. Hyaluronic Acid is universally well tolerated and suitable for all skin types, including sensitive, oily, dry, and combination skin. As a Skin Identical molecule, it integrates seamlessly into the skin's natural hydration system without compromising barrier function. It is especially beneficial for skin experiencing dehydration, climate change, travel, or hormonal transition.

Can I use Hyaluronic Acid with retinol or Vitamin C?

Yes. Hyaluronic Acid layers effectively with all RATIONALE actives, including Vitamin C (AM ritual) and retinol (PM ritual). It is often used to support hydration and comfort when introducing more active formulations. Apply Hyaluronic Acid-rich formulations after cleansing and before treatment serums.

When should I apply Hyaluronic Acid?

Hyaluronic Acid is suitable for both AM and PM use. For optimal hydration, apply to slightly damp skin after cleansing, then layer with treatment serums and finish with a crème, hydragel, or gelcrème to help lock hydration in. Daily use supports cumulative improvement in skin hydration and the appearance of plumpness.

What is the difference between hydration and moisturisation?

Hydration refers to the skin's water content and is supported by humectants such as Hyaluronic Acid. Moisturisation refers to lipid replenishment, supported by Ceramides, Lipids, and crème formulations. Healthy skin requires both: humectants to draw water in, and lipids to seal hydration within the barrier.

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Hyaluronic Acid

Deeply hydrate and plump with Hyaluronic Acid—binding moisture to the skin for enhanced suppleness, elasticity, and long-lasting hydration.