When choosing a hyaluronic acid serum, the percentage displayed on the bottle inevitably catches your eye. 0.1%, 0.2%, 1%... which concentration should you choose? And above all, does a higher concentration necessarily mean better results?
The answer is more nuanced. Dosage is a factor to consider, but it is not enough on its own to judge the effectiveness of a skincare product. In other words, do not necessarily choose your serum based on the percentage displayed on the bottle. For daily use, the form of the hyaluronic acid, the other associated active ingredients, and the product's texture must also be taken into account.
What does hyaluronic acid do for your skin?
Hyaluronic acid is primarily recognized for its moisturizing properties. Naturally present in the skin, it plays an essential role in the skin's ability to retain water. When used in skincare, it helps maintain supple, comfortable, and plumper-looking skin.
By bringing water to the surface of the skin, it helps improve its hydration level, as well as its appearance: the skin appears smoother and fresher, and fine lines related to dehydration may become less visible. It also contributes to preserving cutaneous suppleness and elasticity.
Hyaluronic acid is particularly interesting in serums and creams when the skin lacks comfort or shows signs of dehydration. It helps maintain water in the superficial layers of the skin, which contributes to preserving its suppleness and comfort and making fine lines related to dehydration less visible.
However, its value is not limited to its percentage in the formula: its form and molecular weight also influence its behavior on the skin.
Which hyaluronic acid concentration should you choose?
There is no universal concentration that can determine the effectiveness of a skincare product on its own. Cosmetic formulations can use different concentrations of hyaluronic acid, but the percentage should always be interpreted in light of the form used, its molecular weight, and the overall formulation.
As a benchmark, clinical studies have shown benefits for hydration with formulations containing 0.1% hyaluronic acid.
This figure is therefore not a universal threshold for effectiveness: it simply illustrates that a relatively low concentration can already be used in a formulation that provides hydration benefits.
Why does molecular weight matter so much?
When choosing a hyaluronic acid skincare product, molecular weight can be almost as important as concentration. It is the molecular weight that influences how the active ingredient behaves on the skin and, therefore, the type of action sought.
Hyaluronic acid exists in different forms, with molecules of different sizes. High molecular weight forms remain primarily on the skin's surface. They help retain water there and form a moisturizing film, which helps preserve cutaneous comfort and suppleness.
Lower molecular weight forms can penetrate further into the superficial layers of the skin than high molecular weight forms. Their behavior and effects can therefore differ according to their size and the formulation in which they are used. They allow for different actions on hydration and can contribute to a plumper effect. A study conducted on human skin at the University of Reims Champagne-Ardenne showed differences in penetration depending on the molecular weight of the hyaluronic acid: 20 to 300 kDa forms penetrated the stratum corneum more than 1,000 to 1,400 kDa forms.
Some formulations combine several molecular weights in order to combine different actions and act in a complementary way on skin hydration. Two serums showing a similar concentration of hyaluronic acid can have different properties depending on the forms used.
The right approach is therefore to consider the concentration as one factor among others, rather than as the sole indicator of performance.
How to choose the right serum for your skin?
Rather than systematically looking for the highest concentration, look at the entire formulation:
- the type of hyaluronic acid used and its molecular weight,
- the other active ingredients associated with it, according to your skin's needs,
- the texture and comfort of application, which are particularly important for daily use,
- the formulation as a whole, rather than just the displayed percentage.
If your skin is dehydrated, favor a formula designed to strengthen comfort and hydration. If you are also looking for action on firmness or signs of aging, combining hyaluronic acid with other active ingredients can be interesting.
At Pier Augé, hyaluronic acid is notably present in several skincare products, including the SCULPT A serum, where it is combined with PDRN and other active ingredients.
What is the daily dosage of hyaluronic acid?
The concept of "daily hyaluronic acid dosage" might suggest that there is a precise amount that should not be exceeded. For a cosmetic product applied to the skin, however, there is no universal daily dosage to respect.
The quantity to use depends on the product, its formulation, and the application recommendations. It is therefore not necessary to calculate the exact amount of hyaluronic acid used each day.
The essential thing is to apply the product according to the usage instructions and integrate it into a routine adapted to your skin's needs.
Is a high concentration necessarily more effective?
Not necessarily.
A high concentration may seem more attractive on the label, but it cannot predict the effectiveness of a skincare product on its own.
The concentration cannot be dissociated from the form of hyaluronic acid and the formulation in which it is used. Experimental work shows that molecular weight and concentration can change the physical properties of a formulation.
Molecular weight, the form of the hyaluronic acid, the other active ingredients, and the quality of the formulation also count. A less concentrated product can be perfectly suited to your skin, while a more concentrated formula will not necessarily perform better.
The right approach is therefore to look at the formula as a whole, rather than automatically choosing the product with the highest percentage.
FAQ
What percentage of hyaluronic acid is effective?
There is no universal percentage above which hyaluronic acid becomes effective. Studies have shown benefits for hydration with formulations containing 0.1% hyaluronic acid, but the result also depends on the form of the hyaluronic acid, its molecular weight, and the overall formulation.
Can pregnant women use hyaluronic acid?
The hyaluronic acid used in cosmetic skincare is generally safe for use during pregnancy. If in doubt, especially when the product contains several active ingredients, it is best to check the composition of the product or seek advice from a healthcare professional.
Which hyaluronic acid penetrates deepest?
Lower molecular weight forms of hyaluronic acid can reach deeper layers of the epidermis than high molecular weight forms. Deeper, however, does not necessarily mean more effective: high molecular weight forms are particularly beneficial on the surface of the skin, where they help maintain hydration.