What is the maximum recommended concentration of hyaluronic acid in a serum?
What Concentration of Hyaluronic Acid in a Serum for Optimal Efficacy?
Hyaluronic acid is a star active ingredient in cosmetics, renowned for its hydrating and plumping power. Present in a multitude of serums, it can nevertheless cause confusion when wondering about its ideal concentration. Does it need a high concentration to be effective? Is there a maximum amount not to exceed?
What you need to know about hyaluronic acid concentration
Hyaluronic acid exists in different forms and molecular weights. We distinguish notably:
- High molecular weight hyaluronic acid: remains on the skin's surface and forms a protective hydrating film.
- Low molecular weight hyaluronic acid: penetrates deeper and acts on elasticity, firmness, and fine lines.
The concentration indicated on a serum generally reflects the total percentage of hyaluronic acid used, all forms combined.
The ideal concentration of hyaluronic acid in a serum should not exceed 3%.
Below 0.1%, efficacy remains limited, even if the immediate effect can be pleasant.
Between 0.5% and 1%, a good balance is achieved: the skin is well-hydrated without overload.
Up to 3%, the concentration remains safe and well-tolerated by the majority of skin types.
Beyond 3%, hyaluronic acid can paradoxically have a dehydrating effect, and be more difficult for the skin to absorb, thus reducing its effectiveness.
What to really look for: quality, not just the number
A good hyaluronic acid serum is not measured solely by its concentration. The quality of the formula, the combination of different molecular weights, and integration into a hydrating base play an equally essential role in the overall efficacy of the treatment.
The maximum concentration of hyaluronic acid in a serum is 3%. There is no need to look for overloaded formulas: a balanced formulation, with several molecular weights and a good hydrating base, will always be more beneficial than an overly high, poorly controlled dosage.