Hydrating serum with hyaluronic acid: how to choose the right one for multi-level hydration

Effective skin hydration is about more than delivering an instant smoothing effect. Long-lasting, stable hydration depends on a thoughtfully designed formula that not only helps bind water but also supports its retention within the skin, reduces transepidermal water loss (TEWL), and reinforces the skin barrier.

A hyaluronic acid serum is one of the most popular skincare products for maintaining optimal skin hydration. However, its effectiveness is determined by more than simply the presence of hyaluronic acid or its concentration. Equally important are the number of hyaluronic acid forms used, their molecular weights, the way they work in synergy with other active ingredients, the clinical evidence supporting the formula, and whether the formula has been designed as a comprehensive hydration system.

This is precisely the philosophy behind Aquasphere. Developed in our Laboratory in Poland, this hydrating serum combines three complementary hydration systems that work together to deliver multi-level hydration. The carefully designed formula helps bind water, supports optimal hydration levels, and enhances the comfort of dry, dehydrated, or tight skin.

Why do different forms of hyaluronic acid provide better hydration?

Hyaluronic acid occurs naturally in the body and is one of the key components of the extracellular matrix. It plays an essential role in maintaining optimal skin hydration while also supporting the skin’s firmness and smoothness. Thanks to its exceptional hygroscopic properties, it binds water and helps retain it within the epidermis. However, as we age, the skin’s natural hyaluronic acid levels gradually decline. As a result, the skin may become more prone to dehydration, loss of elasticity, reduced comfort, and a dull appearance, while the first visible signs of ageing, such as fine lines, may become more pronounced.

Simply applying hyaluronic acid to the skin’s surface may provide an immediate soothing and smoothing effect, but this is only temporary. Long-lasting hydration requires more than a single active ingredient. This is why advanced skincare formulas combine multiple forms of hyaluronic acid with different molecular weights. Each serves a distinct purpose: lower molecular weight forms help support hydration, softness, and elasticity, while higher molecular weight forms remain on the skin’s surface, creating a protective layer that helps reduce water loss and reinforce the skin barrier. Together, they enable the formula to deliver long-lasting, multi-level hydration rather than providing only a short-lived effect immediately after application.

Aquasphere – more than a hyaluronic acid serum

This is the principle behind Aquasphere – a multi-level hydrating serum with hyaluronic acid, developed in our Laboratory in Poland.

Rather than relying on a single hydrating ingredient, its formula has been designed as a comprehensive multi-level hydration system that supports water binding, enhances the skin’s natural hydration reserves, and helps maintain long-lasting hydration.

At the heart of the formula is a complex of five forms of hyaluronic acid with different molecular weights, each working at different levels of the skin to provide comprehensive hydration. One of the key ingredients is Sodium Hyaluronate Crosspolymer — a cross-linked form of hyaluronic acid that forms a water-binding micro-network on the skin’s surface and gradually releases moisture over time. This helps support long-lasting hydration while maintaining the skin’s softness, smoothness, and overall comfort.

The formula is further enriched with hyaluronic acid and elastin precursors – biotechnological ingredients derived from fungal biomass that support the skin’s natural synthesis of hyaluronic acid and elastin, while improving hydration, elasticity, and resilience.

Aquasphere is further enhanced by the proprietary Oio Lab Aqua Retention Complex™, a blend of ingredients designed to support the skin’s ability to retain moisture over time. It combines tamarind seed polysaccharides, bioactive marine-derived ingredients, and Damask rose petal essence to help retain water within the skin, reduce moisture loss, and promote long-lasting hydration rather than providing only a temporary effect.

Results confirmed by studies

The effectiveness of the Aquasphere formula has been confirmed through instrumental and consumer studies, demonstrating improvements in skin hydration, elasticity, and overall appearance.

Selected study results:

• +49.5% skin hydration after 7 days of use*

• +56% skin hydration after 28 days of use*

• –13% transepidermal water loss (TEWL) after 7 days of use*

• Up to 16% reduction in wrinkle length and up to 13% reduction in wrinkle depth after 28 days of use*

• 96% of participants reported hydrated and softer-looking skin**

• 88% of participants reported smoother, more elastic-looking skin*

*Instrumental studies – objective assessment of skin parameters using specialised measurement devices.

** Consumer studies – self-assessment conducted by 25 participants (aged 18–60) after 4 weeks of use.

When should you use a hyaluronic acid serum?

A hydrating serum with hyaluronic acid is particularly beneficial when the skin feels tight, rough, uncomfortable, or appears tired and dull. It’s also worth remembering that dehydration is not limited to a specific skin type – it can affect dry, combination, oily, and sensitive skin alike.

When it comes to dehydrated skin, what matters most is not the richness of the product’s texture, but the way its formula has been designed. A well-formulated hydrating serum should not only provide water-binding ingredients but also support the skin’s ability to retain moisture and help reduce transepidermal water loss (TEWL).

How to choose a good hyaluronic acid serum

When choosing a hydrating serum with hyaluronic acid, look beyond the presence of the ingredient itself. Instead, consider the overall architecture of the formula: the number and types of hyaluronic acid, ingredients that support water retention, the formula’s impact on transepidermal water loss (TEWL), its ability to support the skin barrier, and the clinical evidence confirming its effectiveness.

Aquasphere meets all of these criteria. It combines five forms of hyaluronic acid, hyaluronic acid and elastin precursors, and the proprietary Oio Lab Aqua Retention Complex™. Its efficacy has been confirmed through instrumental and application studies.

How to use a hyaluronic acid serum in your daily skincare routine

A well-designed skincare routine plays an important role in the effectiveness of a hydrating serum. Applying products in the right order helps maximise the performance of both the formula and its active ingredients while supporting optimal skin hydration.

Thanks to its lightweight gel texture, Aquasphere fits seamlessly into both morning and evening skincare routines. As hyaluronic acid binds water, the serum is best applied to slightly damp skin to enhance comfort and leave the skin feeling softer, smoother, and more supple.
Apply the serum after your toner or cleansing milk, such as Fulvic Ionic or O-Mega Milk by Oio Lab, which prepare the skin for the next steps of your skincare routine. Gently massage a small amount into the face and neck using upward motions until fully absorbed.

Follow with a product that helps seal in hydration and supports long-lasting moisture retention. Depending on your skin’s needs, this can be a cream, emulsion, or facial oil from Oio Lab. Together, these steps help maintain optimal hydration levels while supporting the skin barrier. Complete your morning routine with Holitint – Oio Lab’s holistic skin tint serum that combines the benefits of skincare with the appearance of naturally radiant, even-looking skin.

Bibliography:

1. M. Bernat, M. Matysek-Nawrocka,W. Cioczek (2016). Active ingredients in anti-aging skincare products.
   https://aestheticcosmetology.com/wp-content/uploads/2019/02/ke2016.6-3.pdf
2. Dawson, L. J., &Stanbury, J. (2022). Benefits of topical hyaluronic acid for skin quality and signs of skin aging. https://www.researchgate.net/publication/374215889_BENEFITS_OF_TOPICAL_HYALURONIC_ACID_FOR_SKIN_QUALITY_AND_SIGNS_OF_SKIN_AGING
3. Hemmings, K. W., &Leary, J. D. (2022). Evaluation of antioxidants’ ability to enhance hyaluronic acid-based topical moisturizers. https://www.researchgate.net/publication/377460505_Evaluation_of_Antioxidants%27_Ability_to_Enhance_Hyaluronic_Acid-Based_Topical_Moisturizers