Hyaluronic Acid
A large, moisture-binding molecule (a glycosaminoglycan) found naturally in skin that draws and holds water, helping skin stay hydrated and plump.
Hyaluronic acid (HA) is a glycosaminoglycan — a long chain of sugar-like units (a polysaccharide) your body produces naturally. It's found naturally in your skin, connective tissue, and eyes. In skincare, it belongs to the humectant class of moisturising ingredients, meaning its primary job is attracting and binding water rather than creating an oily barrier on the surface.
HA works by holding many times its own weight in water (a figure often cited as up to 1,000 times), drawing moisture from the environment and deeper skin layers into the upper layers of the epidermis. Formulations typically use it at concentrations between 0.1% and 2%, and you'll often see multiple molecular weights in a single product. Higher-weight HA sits closer to the skin's surface and helps reduce moisture loss, while lower-weight HA can penetrate further to support hydration from within. It's commonly found in serums, essences, and lightweight gel moisturisers, and it layers well under heavier creams and oils.
If your skin feels tight, rough, or looks a bit flat and tired, HA is a gentle starting point worth understanding. It pairs beautifully with ingredients like niacinamide, ceramides, and vitamin C. For best results, apply it to slightly damp skin and follow with a moisturiser or occlusive layer to seal that hydration in. This step matters because in very dry or low-humidity environments (common across much of Australia), HA without an occlusive on top can actually draw water out of your skin instead of into it.
Honest limits: HA is a hydration support, not a structural repair ingredient. It won't rebuild collagen, reverse sun damage, or replace sunscreen. While it's well tolerated by most skin types, very low molecular weight HA can occasionally trigger sensitivity in reactive skin, so patch testing is a kind habit when you're starting out. If persistent dryness or irritation doesn't improve with consistent hydration, it's worth speaking with a skincare professional to understand what else might be going on.
HA works by holding many times its own weight in water (a figure often cited as up to 1,000 times), drawing moisture from the environment and deeper skin layers into the upper layers of the epidermis. Formulations typically use it at concentrations between 0.1% and 2%, and you'll often see multiple molecular weights in a single product. Higher-weight HA sits closer to the skin's surface and helps reduce moisture loss, while lower-weight HA can penetrate further to support hydration from within. It's commonly found in serums, essences, and lightweight gel moisturisers, and it layers well under heavier creams and oils.
If your skin feels tight, rough, or looks a bit flat and tired, HA is a gentle starting point worth understanding. It pairs beautifully with ingredients like niacinamide, ceramides, and vitamin C. For best results, apply it to slightly damp skin and follow with a moisturiser or occlusive layer to seal that hydration in. This step matters because in very dry or low-humidity environments (common across much of Australia), HA without an occlusive on top can actually draw water out of your skin instead of into it.
Honest limits: HA is a hydration support, not a structural repair ingredient. It won't rebuild collagen, reverse sun damage, or replace sunscreen. While it's well tolerated by most skin types, very low molecular weight HA can occasionally trigger sensitivity in reactive skin, so patch testing is a kind habit when you're starting out. If persistent dryness or irritation doesn't improve with consistent hydration, it's worth speaking with a skincare professional to understand what else might be going on.
