The Ordinary Lactic Acid 5% Exfoliating Serum with Hyaluronic Acid 2% — 1 fl oz, Gentle Hydrating AHA

The Ordinary Lactic Acid 5% + Hyaluronic Acid 2% is a water-based, mild AHA serum that gently exfoliates to smooth texture and brighten skin while supporting hydration and reducing irritation.

Powered by a 5% concentration of lactic acid paired with 2% hyaluronic acid and Tasmanian Pepperberry extract, this lightweight serum is designed to refine surface texture without overstripping. Its formulation balances acidity around pH 3.8 for effective, controlled exfoliation suitable for those with dry or sensitive skin seeking gradual improvement in tone and smoothness.

How will this serum change my skin’s texture?

Lactic acid is an alpha hydroxy acid that loosens bonds between dead skin cells on the surface, encouraging natural renewal. With a moderate 5% strength, it reduces roughness and reveals a softer, more even-looking complexion over consistent use.

• Targets surface dead skin cells to reduce flakiness and unevenness
• Promotes a smoother feel without aggressive peeling
• Visible improvements typically appear with regular nightly use

Can I use this serum if I have sensitive or dry skin?

This formula was created with sensitivity in mind: the 5% lactic acid is on the gentler side of AHAs and the serum includes hyaluronic acid for moisture and Tasmanian Pepperberry to help calm irritation. Because it’s water-based and lower strength, many with dry or reactive skin can use it while minimizing discomfort.

• Hyaluronic acid adds hydration to counteract dryness
• Tasmanian Pepperberry extract helps reduce potential redness
• Recommended to patch test and introduce one or two nights per week first

How should I add this product to my routine safely?

Apply once daily in the evening after cleansing and before heavier treatments or moisturizers. Start slowly—every other night or a few times a week—and always follow with broad-spectrum sunscreen during daytime to protect newly exposed skin.

• Use in evening; allow skin to acclimate gradually
• Combine with hydrating serums or a gentle moisturizer
• Always wear sunscreen the following day to prevent sun sensitivity

What makes the formulation effective at this pH and concentration?

The product’s pH is approximately 3.8, which aligns closely with lactic acid’s pKa to provide an optimal balance of acidic and salt forms for controlled exfoliation. At 5% strength, you get measurable resurfacing action without high irritation risk common to stronger acids.

• pH near lactic acid pKa ensures efficient acid availability
• Lower concentration reduces the chance of excessive peeling
• Water-based delivery keeps the serum lightweight and layerable

Who is this for? If you have dry, combination, or sensitive skin and want gentle yet consistent exfoliation to smooth texture, brighten your complexion, and retain hydration, this serum is an appropriate option. It’s suited for users who prefer conservative acid strengths, those transitioning into chemical exfoliants, or anyone looking to add a hydrating AHA step to a nightly skincare routine. Avoid use if you are using strong retinoids or other potent actives without professional guidance; always patch test and use sun protection daily.

Ingredients

Aqua (Water), Lactic Acid, Glycerin, Pentylene Glycol, Propanediol, Sodium Hyaluronate Crosspolymer, Tasmannia Lanceolata Fruit/Leaf Extract, Acacia Senegal Gum, Xanthan Gum, Isoceteth-20, Trisodium Ethylenediamine Disuccinate, Sodium Hydroxide, Ethylhexylglycerin, 1,2-Hexanediol, Caprylyl Glycol.