4D Hyaluronic Serum | O Cosmedics product image 1

4D Hyaluronic Serum | O Cosmedics

$89.00
$89.00 $99.00
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4D Hyaluronic Serum | O Cosmedics product image 1
  • 4D Hyaluronic Serum | O Cosmedics product image 1
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  • 4D Hyaluronic Serum | O Cosmedics hydration ingredient graphic
  • 4D Hyaluronic Serum | O Cosmedics product image 1
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  • 4D Hyaluronic Serum | O Cosmedics hydration ingredient graphic
4D Hyaluronic Serum | O Cosmedics

O Cosmedics

4D Hyaluronic Serum | O Cosmedics

$89.00
$89.00 $99.00

The cult-favourite hydration serum you know and love has evolved.

Formerly known as 3D Hyaluronic Serum, the new 4D Hyaluronic Serum takes hydration to the next level with an advanced complex of four forms of Hyaluronic Acid working synergistically across multiple layers of the skin.

This lightweight 30ml water-gel serum helps deliver immediate moisture, long-lasting hydration and enhanced barrier support while improving the look of skin smoothness, elasticity and resilience. Skin is left feeling supple, refreshed and deeply hydrated with a radiant, plumper-looking glow.

Why you'll love it

  • Now powered by four forms of Hyaluronic Acid — a sophisticated blend of four Sodium Hyaluronate technologies designed to work in synergy across multiple skin layers.
  • Same multi-layer hydration with extra precision — the upgraded 4D system helps optimise hydration delivery at every level of the skin.
  • Enhanced barrier protection — ultra-high molecular weight Sodium Hyaluronate Crosspolymer creates a protective moisture shield to help reduce transepidermal water loss.
  • Advanced skin surface performance — Sodium Acetylated Hyaluronate adheres more effectively to the skin’s surface for longer-lasting hydration and improved comfort.
  • Deeper hydration technology — ultra-low molecular weight Hydrolyzed Sodium Hyaluronate penetrates deeper to support moisture reserves, visible elasticity and skin bounce.
  • A true formulation upgrade — more than a name change, this next-generation hydration network is designed to deliver more comprehensive hydration and stronger overall skin performance.

Best for

  • Dehydrated, dry or dull skin
  • Barrier-compromised or uncomfortable skin
  • All skin types wanting plumper, smoother-looking hydration support
  • Beginners in active skincare who want to restore and rebalance hydration levels

How to use

  • Apply morning and night
  • Dispense 1 pump onto fingertips
  • Apply to freshly cleansed skin on the face, eye area, neck and décolletage
  • Use after water-like serums and before creams or oils
  • Follow with your hydrator, plus SPF in the morning

Full ingredients

Aqua, Pentylene Glycol, Ethoxydiglycol, Glycerin, Propanediol, Sodium Hyaluronate Crosspolymer, Sodium Hyaluronate, Sodium Acetylated Hyaluronate, Hydrolyzed Sodium Hyaluronate, Ethylhexylglycerin, Heptyl Glucoside, Sodium Benzoate, Potassium Sorbate, Sodium Levulinate, Citric Acid.

O Cosmedics

Everything you need to know before you buy

A lightweight hydration serum that helps skin feel plumper, smoother and more comfortable with multi-level moisture support.

Why you’ll love it

  • Four forms of Hyaluronic Acid for multi-level hydration support
  • Lightweight water-gel texture that layers beautifully under the rest of your routine
  • Helps skin feel plumper, smoother and more comfortable
  • Supports barrier hydration while helping reduce that tight, dry feeling
  • Suitable for daily use when skin needs extra moisture and bounce

Skin concerns

Dryness & dehydration Dullness & lack of glow Tight or uncomfortable skin Barrier stress

Suitable skin type

Dry / dehydrated Normal / combination Sensitive / compromised Most skin types needing extra hydration

Key ingredients

Sodium Hyaluronate Sodium Hyaluronate Crosspolymer Sodium Acetylated Hyaluronate Hydrolyzed Sodium Hyaluronate

Expected results

  • Skin feels more hydrated and comfortable
  • A plumper, smoother-looking finish
  • Better support for glow, softness and bounce
  • More consistent hydration through your routine

How to use

Apply 1 pump to freshly cleansed skin on the face, eye area, neck and décolletage morning and night. Use after water-like serums and before creams or oils. Follow with moisturiser, plus SPF in the morning.

Morning routine

Apply after cleansing and lighter serums, then follow with moisturiser and SPF as your final morning step.

Evening routine

Apply after cleansing and before moisturiser as your hydration step in the evening. Pair it with calming or barrier-supporting products if your skin feels stressed or dry.

Key ingredients explained

This formula includes a broader ingredient list as well as a few hero ingredients worth paying attention to.

  • Sodium Hyaluronate is one of the hero ingredients highlighted in this formula.
  • Sodium Hyaluronate Crosspolymer is one of the hero ingredients highlighted in this formula.
  • Sodium Acetylated Hyaluronate is one of the hero ingredients highlighted in this formula.
  • Hydrolyzed Sodium Hyaluronate is one of the hero ingredients highlighted in this formula.

FAQ

When should I use this product in my routine?

Apply 1 pump to freshly cleansed skin on the face, eye area, neck and décolletage morning and night. Use after water-like serums and before creams or oils. Follow with moisturiser, plus SPF in the morning.

How long does it take to see results?

That depends on your skin, your consistency and what concern you are targeting, but most products work best when used regularly for several weeks rather than judged after a few days.

Can I pair this with other active products?

Usually yes, but layering matters. If you are using actives like retinol, exfoliants or pigment-correcting products, the safest path is to build your routine around your main concern and ask for a personalised recommendation if you are unsure.

Customer reviews

We’re building out more customer feedback here. If you’d like help choosing the right fit, get in touch and we’ll point you in the right direction.

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