Lactic Acid Peel
The gentlest AHA — exfoliates whilst hydrating. Ideal for sensitive skin, mild pigmentation, and first-time peel patients.
AHA (Alpha Hydroxy Acid) · Water-Soluble · Derived from Milk
What Is a Lactic Acid Peel?
Lactic acid is an alpha hydroxy acid (AHA) naturally derived from milk — and it is also a component of your skin's own natural moisturising factor (NMF). This dual identity is what makes lactic acid uniquely gentle: it exfoliates the stratum corneum whilst simultaneously attracting and retaining moisture within the skin.
With a larger molecular weight than glycolic acid (90.08 g/mol vs 76.05 g/mol), lactic acid penetrates more slowly and superficially. This is an advantage for sensitive, dry, rosacea-prone, or reactive skin types — providing meaningful exfoliation without the aggressive penetration that can trigger irritation, redness, or post-inflammatory hyperpigmentation.
Lactic acid also inhibits tyrosinase, the key enzyme in melanin production, making it effective for mild-to-moderate pigmentation concerns. At CosmeDocs, we use lactic acid as both a standalone peel for sensitive patients and as a component of our multi-acid Peel to Reveal cocktail.
Supporting Ingredients
Azelaic Acid
An anti-inflammatory dicarboxylic acid that reduces redness, inhibits melanin production, and targets rosacea symptoms. Ideal alongside lactic acid for patients with sensitive, pigmentation-prone skin.
Mandelic Acid
A large-molecule AHA from almonds that provides gentle, even exfoliation. Combined with lactic acid, it creates a dual-AHA peel safe for Fitzpatrick IV–VI skin types.
Hyaluronic Acid
Applied post-peel to amplify lactic acid's natural hydrating effect. Draws moisture into the skin, reducing tightness and accelerating barrier recovery.
Retinol (Vitamin A)
Used in pre-peel protocols to gently accelerate cell turnover. At lower concentrations, it primes sensitive skin without over-stimulation.
Antioxidants (Vitamin C, Glutathione, Kojic Acid)
Post-peel application to protect against UV-induced free radical damage, enhance brightening, and support the depigmenting action of lactic acid.
Pyruvic Acid
A keto acid sometimes blended with lactic acid for patients needing slightly deeper exfoliation without the intensity of glycolic acid. Pyruvic acid converts to lactic acid on the skin, providing a controlled two-phase peel.
Am I Suitable?
Ideal For
- • Sensitive or reactive skin
- • Dry, dehydrated complexion
- • Mild hyperpigmentation
- • First-time peel patients
- • Rosacea-prone skin (at low concentrations)
- • Uneven skin tone
May Not Be Suitable
- • Milk protein allergy (rare but relevant)
- • Active flaring eczema or dermatitis
- • Pregnancy or breastfeeding
- • Recent isotretinoin use
- • Sunburned or compromised skin barrier
- • Active infections on treatment area
Frequently Asked Questions
Other Peel Types
At a Glance
Duration
20–45 minutes
Course
3–6 sessions
Recovery
1–7 days peeling
Types
Light, medium, deep
Treatment Pricing
Includes skin assessment
Natasha W.
"After three chemical peels my pigmentation has faded dramatically. My skin is the clearest it's been in years. Worth every session."
More real experiencesLactic Acid Peel London — Clinical Guide
Lactic acid (2-hydroxypropanoic acid, C₃H₆O₃) is a naturally occurring alpha hydroxy acid first isolated from sour milk by Swedish chemist Carl Wilhelm Scheele in 1780. It is also an endogenous component of the skin's natural moisturising factor (NMF), contributing to the stratum corneum's hydration and barrier function.
The mechanism of action involves disruption of corneodesmosomes — the protein bridges between corneocytes — at the skin surface. Unlike glycolic acid, which penetrates rapidly and deeply due to its smaller molecular weight, lactic acid's larger molecular size (90.08 g/mol) creates a more gradual, superficial exfoliation with inherently lower irritation potential.
Lactic acid simultaneously functions as a humectant, attracting water molecules from the dermis and the environment into the epidermal layers. This dual exfoliant-humectant action makes it particularly valuable for patients presenting with dry, dehydrated skin alongside textural concerns — a common clinical scenario in mature or hormonally-affected skin.
At CosmeDocs, lactic acid peels are enhanced with azelaic acid for its anti-inflammatory and depigmenting synergy, mandelic acid for broad-spectrum gentle exfoliation, and post-peel antioxidant protocols (glutathione, ascorbic acid) for oxidative protection. The Peel to Reveal cocktail incorporates lactic acid alongside glycolic, salicylic, and TCA acids for patients requiring comprehensive multi-concern treatment. Bold, natural, always your way.