Hyaluronic acid (often shortened to HA) is a substance naturally produced by the body and found in high concentrations in the skin, joints, and connective tissues. Its primary role is hydration — it attracts and holds onto water, helping tissues stay plump, cushioned, and resilient.
One molecule of hyaluronic acid can bind up to 1,000 times its weight in water, which is why it’s so beloved in skincare.
How it benefits the skin
In topical skincare, hyaluronic acid works as a humectant, meaning it draws moisture into the skin rather than adding oil.
Benefits include:
Deep hydration without heaviness
Improved skin plumpness and softness
Reduced appearance of fine lines caused by dehydration
Support for the skin barrier and elasticity
A smooth, dewy finish that layers well under oils and creams
It’s suitable for all skin types, including oily and acne-prone skin, because it hydrates without clogging pores.
Different molecular weights (important detail)
Not all hyaluronic acid behaves the same:
High molecular weight HA sits on the surface, providing immediate hydration and a smoothing effect
Low molecular weight HA penetrates more deeply, supporting longer-term hydration and elasticity
Many well-formulated products use multiple molecular weights for both instant and lasting benefits.