Ingredient Glossary · Cosmetic Active
Lactic Acid
2-Hydroxypropanoic acid · دودھ کا تیزاب
The alpha-hydroxy acid that exfoliates, hydrates, and brightens in a single molecule — a component of the skin\'s own Natural Moisturising Factor. Doodh ka Tezaab — nikhar ka raaz, qudrat ka tohfa.
50-21-5
CAS Number
Max 10%
pH ≥3.5
Annex III
EU AHA Group
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At a Glance
Quick Reference
IUPAC Name
2-Hydroxypropanoic acid
CAS / INCI
50-21-5 / LACTIC ACID
Formula / MW
C₃H₆O₃ / 90.08 g/mol
Physical Form
Clear to pale yellow hygroscopic liquid (88% in water)
pH (1% Solution)
2.4–2.8 (strongly acidic; adjust in formulation)
Density
1.18–1.21 g/mL at 20°C (88% grade)
pKa
3.86 (controls exfoliation vs humectant mode)
Halal Status
Conditional — plant fermentation = Halal
Mechanism
Desmolytic exfoliation + NMF replenishment + fibroblast stimulation (triple mechanism)
Key Functions
AHA exfoliant, keratolytic, humectant, pH adjuster, NMF constituent, brightening agent
Regulatory Status
EU: Annex III AHA group (≤2.5% pH≥5 / ≤10% pH≥3.5) · FDA: GRAS · DRAP: No restriction
Origin / Production
Bacterial fermentation of plant sugars (corn/beet glucose via Lactobacillus); 88% cosmetic grade
Urdu / Pakistan Name
Doodh ka Tezaab (دودھ کا تیزاب) · Nikhar Tezaab (نکھار تیزاب)
Shelf Life
24–36 months sealed at <25°C; 18–24 months opened
Introduction
The Exfoliant That Hydrates
Lactic acid (INCI: LACTIC ACID; CAS 50-21-5) is one of the most scientifically validated and commercially versatile cosmetic actives available to formulators. As both a powerful alpha-hydroxy acid exfoliant and a key component of the skin\'s own Natural Moisturising Factor (NMF), it occupies a unique position among cosmetic ingredients: simultaneously removing dead surface cells while hydrating and conditioning the skin below. This dual action — exfoliating and moisturising in a single molecule — makes lactic acid irreplaceable in modern skin care formulation.
For Pakistani formulators, lactic acid addresses the nation\'s most commercially important skin concerns: hyperpigmentation (goray rang / nikhar), post-acne marks, roughness and uneven texture, and the desire for a brighter, more luminous complexion. Its relatively large molecular size compared to glycolic acid grants it a gentler penetration profile, making it the preferred AHA for sensitive or darker skin tones — a property of enormous relevance for Pakistan\'s largely Fitzpatrick III–VI consumer base.
Produced commercially through microbial fermentation of plant-derived sugars (primarily glucose from corn or beet) by Lactobacillus species, cosmetic-grade lactic acid is typically supplied at 88% concentration in water. The L-isomer is the biologically active form found both in human skin and in commercial cosmetic-grade material. Its mechanisms include desmosome weakening, NMF replenishment, and at higher concentrations, fibroblast stimulation for collagen synthesis.
Bio Shop™ Pakistan — Sourcing Note
Bio Shop™ stocks cosmetic-grade lactic acid (88% w/w) from established international manufacturers with traceable plant-fermentation supply chains. CoA documentation with assay percentage, heavy metals panel, and microbial limits available upon request. Available at bioshop.pk.
Chemical Identity
Molecular Profile
IUPAC Name2-Hydroxypropanoic acid
Common SynonymsL-Lactic acid, DL-Lactic acid, Milk Acid, Sarcolactic acid
CAS Number50-21-5 (racemic DL); 79-33-4 (L-lactic acid)
EINECS200-018-0
INCILACTIC ACID
CosIng FunctionHumectant, Skin conditioning, pH regulator
Molecular FormulaC₃H₆O₃
Molecular Weight90.08 g/mol
Structural ClassAlpha-hydroxy acid (AHA) — carboxylic acid with alpha-hydroxyl
Functional GroupHydroxyl (–OH) at alpha position + Carboxyl (–COOH) — pKa 3.86
Log P−0.72 (highly hydrophilic)
Synthesis RouteHomofermentative bacterial fermentation (Lactobacillus) of plant-derived glucose → calcium lactate → acidification → purification
Urdu NameDoodh ka Tezaab (دودھ کا تیزاب) · Nikhar Tezaab (نکھار تیزاب)
Grade Profiles
Quality Tiers
Pharmaceutical
USP/EP Grade
Japan · Europe (Corbion)
Purity (HPLC)
≥99%
L-Lactic Acid (anhydrous)
Gold standard for clinical-strength peels and medical applications. USP/EP pharmacopoeia compliance with stringent heavy metal limits.
Cosmetic
Cosmetic Grade 88%
China · Europe (fermentation)
Assay
88%
Lactic Acid in Water
Bio Shop™ standard. Most versatile — suitable for serums, toners, peels, body care, pH adjustment. CoA with HPLC, heavy metals, microbials.
Food
Food Grade 80–90%
China (bulk fermentation)
Assay Range
80–90%
DL-Lactic Acid
Lower purity, suitable for pH adjustment and non-active cosmetic applications. More affordable but may lack the L-isomer specificity needed for NMF claims.
Warning
Adulterated / Diluted
Grey market · Pakistan local
Actual Content
<80%
Diluted with glycerol, PG, or acetic acid
1% solution pH above 3.5 = diluted. Vinegar smell = acetic acid extender. Density below 1.18 g/mL. Reject — request CoA from Bio Shop™.
Concentration Behaviour
Use Levels & Dosing
pH Adjuster0.05–0.5%
Functional pH correction with trace NMF benefit. Used in virtually every water-based formula. No significant exfoliation at these levels.
Gentle Daily Exfoliant0.5–2.5%
Gentle-to-moderate exfoliation with meaningful NMF humectancy. Visible brightening over 4–8 weeks. Ideal for daily-use serums, toners, moisturisers.
Active AHA Serum2.5–5%
Clear exfoliation; measurable TEWL reduction; brightening in 4–6 weeks. Requires pH 3.5–4.5 and SPF advisory. Experienced users or professional guidance.
Strong Consumer Peel5–10%
Strong keratolytic. Rapid cell turnover, collagen stimulation begins. Texture improvement in 2–4 weeks. Body lotions, foot creams, AHA washes.
Professional Peel10–30%
Professional salon peel — NOT for unsupervised consumer use. Significant dermal penetration. Collagen remodelling. Timed application only.
Clinical Peel>30%
Dermatologist or clinical aesthetician use only. Deep dermal penetration, significant irritation risk. Beyond cosmetic category entirely.
Functional Performance
Triple Mechanism
Mechanism 1 · Exfoliation
Desmolytic Action
The free acid form of lactic acid (non-ionised, predominant below pKa 3.86) penetrates between corneocytes and weakens the ionic bonds of corneodesmosomes — the protein bridges anchoring dead skin cells together. This controlled desquamation removes melanin-containing surface cells, improving texture, brightness, and radiance. First documented by Van Scott and Yu (1974) and confirmed in extensive clinical research. pH is the control parameter: pH 3–4.5 = active exfoliation; pH 5+ = minimal exfoliation.
Mechanism 2 · Hydration
NMF Replenishment
L-lactic acid is a primary component of the skin\'s Natural Moisturising Factor — the hygroscopic complex within corneocytes that attracts and binds water. At pH 5–6.5, lactic acid (as lactate) is incorporated into this NMF pool, increasing the water-binding capacity of the stratum corneum and reducing transepidermal water loss (TEWL). Clinical measurements confirm 20–40% TEWL reduction within 2–4 weeks. This dual exfoliation-and-hydration function is lactic acid\'s defining commercial advantage.
Mechanism 3 · Anti-Ageing
Fibroblast Stimulation
At higher concentrations (>5%), lactic acid signals dermal fibroblasts to produce collagen types I and III, and glycosaminoglycans (hyaluronic acid precursors). This anti-ageing remodelling goes beyond surface exfoliation to restructure the dermal matrix. Clinical evidence (Stiller et al., 1996) documents significant improvement in photodamaged skin with 8% L-lactic acid cream over 22 weeks. Requires controlled application and professional guidance at these concentrations.
AHA Exfoliant
NMF Component
Keratolytic
pH Adjuster
Humectant
Brightening
Desmosome Disruptor
Collagen Stimulant
Skin-Identical
Barrier Support
Formulation Lab
Three Formulas
Nikhar-e-Dahi Serum · نکھار دہی سیرم
Desi-Inspired Brightening AHA Serum — Leave-on · 100g batch
Distilled Water73.00g
Organic Rose Water5.00g
Propanediol3.00g
Lactic Acid 88%2.30g
Sodium Lactate2.00g
Alpha Arbutin Powder1.00g
Phenoxyethanol0.90g
Xanthan Gum0.30g
Allantoin0.20g
Ethylhexylglycerin0.20g
EDTA 2NA0.10g
Method
Disperse xanthan gum in water with high-shear mixing (20 min). Dissolve niacinamide, arbutin, allantoin, EDTA, sodium lactate, propanediol in warm water (40°C). Combine phases, mix until uniform. Cool to room temperature. Add lactic acid 88% and panthenol. Measure pH — target 4.3–4.7. Adjust with citric acid (to lower) or 5% NaOH (to raise). Add phenoxyethanol + ethylhexylglycerin at <40°C. Package in amber glass dropper bottle. Label: Use sunscreen daily. Shelf life: 18–24 months.
AHA Perfecting Toner · اے ایچ اے ٹونر
Daily Exfoliant + Brightening Toner — Leave-on · 100g batch
Distilled Water81.40g
Lactic Acid 88%3.50g
Propanediol3.00g
Witch Hazel Liquid3.00g
Sodium PCA1.00g
Glycolic Acid0.60g
Zinc PCA0.50g
Germall Plus Liquid0.50g
Allantoin0.10g
EDTA 2NA0.10g
Method
Dissolve all water-phase ingredients (niacinamide, propanediol, sodium PCA, zinc PCA, allantoin, EDTA) in distilled water at room temperature (20 min). Add acids (lactic acid 88% + glycolic acid) directly, mix well. Measure pH. Adjust to 3.8–4.2 with 5% NaOH dropwise. Add Germall Plus and witch hazel. Filter through 0.45µm (optional) for clarity. Fill into PET or glass toner bottles. Label: Use SPF 30+ daily. Apply with cotton pad. Shelf life: 18–24 months.
Scalp Purifying Shampoo · اسکالپ شیمپو
AHA Scalp Exfoliant Shampoo — Wash-off · 100g batch
Shampoo Base (SLES)75.00g
Distilled Water8.30g
Coco Betaine Liquid5.00g
Zinc Pyrithione2.00g
Lactic Acid 88%1.20g
Fragrance (Tea Tree / Peppermint)1.00g
NaCl (Viscosity)1.00g
Rosemary Extract1.00g
Germall Plus Liquid0.50g
Method
Warm Shampoo Base to 40°C. Add coco betaine, mix gently (avoid excessive aeration). Disperse PQ-10 and zinc pyrithione in a small amount of warm water (40°C), blend into main batch. Add panthenol, rosemary extract, and aloe vera at ≤40°C. Add lactic acid dropwise, measure pH — target 4.8–5.2. Add NaCl gradually to desired viscosity (2,000–4,000 mPa·s). Add Germall Plus and fragrance at ≤40°C. Final pH check. Position as weekly scalp purifying shampoo. Shelf life: 24 months.
Synergy Partners
Ingredient Pairings
Brightening Synergists
AHA Partners
Hydration & NMF
Formulation Essentials
Comparisons
How It Compares
Glycolic Acid
Hydroxyacetic acid — MW 76.05 g/mol (smallest AHA)
Penetration
Fastest AHA — smallest molecule reaches deeper faster
Exfoliation
Strongest; superior for anti-ageing and photodamage
Use With LA
Excellent AHA duo at 1:2–1:4 ratio (GA:LA) for balanced peels
Pakistan Market
Higher irritation → PIH risk on dark skin. LA preferred for Fitzpatrick III–VI
Glycolic Acid is the stronger exfoliant but more irritating. Lactic Acid is gentler, hydrating, and safer for South Asian skin. Use together for balanced dual-AHA formulas.
Mandelic Acid
2-Hydroxy-2-phenylacetic acid — MW 152.15 g/mol (largest AHA)
Penetration
Slowest AHA — aromatic ring creates steric bulk
Gentleness
Gentlest AHA; ideal for acne-prone pigmented skin
Use With LA
Can combine for sensitive skin peels; different penetration depths
Pakistan Market
Less evidence base than LA; niche position for very sensitive skin
Mandelic is gentler but less proven. Lactic Acid offers the best balance of efficacy, evidence, and tolerability for mainstream Pakistani formulation.
Salicylic Acid
2-Hydroxybenzoic acid — BHA (lipid-soluble)
Solubility
Oil-soluble (BHA) — penetrates sebum-filled pores directly
Best For
Acne, comedones, oily pores. Superior for congested oily skin
Use With LA
Complementary: AHA (surface) + BHA (pore). Use alternately or in wash-off products
Pakistan Market
Very popular for acne. LA better for brightening; SA better for acne control
Different mechanism entirely — SA is oil-soluble, LA is water-soluble. SA for pore clearing, LA for exfoliation + hydration. Best used in alternation for acne-prone hyperpigmented skin.
Sodium Lactate
Sodium salt of lactic acid — pH ~7
Mechanism
Pure NMF humectant — NO exfoliation at neutral pH
Relationship
Same molecule, different form. Lactic acid at pH 5+ → sodium lactate in situ
Use With LA
Create tunable buffer system: more lactate = more hydration, more acid = more exfoliation
Pakistan Market
Complementary ingredient. Use both in same formula for optimised NMF system
Sodium Lactate is lactic acid\'s own salt — the hydrating partner without exfoliation. Combine LA + Sodium Lactate for a tunable exfoliation/hydration system that mirrors the skin\'s own NMF.
Safety & Regulatory
Compliance Profile
Professional formulator reference only. Always consult the current EU Cosmetics Regulation (EC) No 1223/2009, SCCS opinions, FDA guidelines, and the ingredient\'s SDS before commercial formulation. This document does not constitute regulatory or safety advice.
EU Cosmetics Regulation
Lactic acid falls under the AHA group in EU Reg. (EC) No 1223/2009 Annex III. SCCNFP precautionary guidance: ≤2.5% at pH ≥5 for consumer leave-on products. CIR Expert Panel and market practice support up to 10% at pH ≥3.5 with UV advisory labelling. Not prohibited (not in Annex II). Products must include SPF advisory above 0.5% AHA concentration.
FDA Status (USA)
Generally Recognised As Safe (GRAS) for food use under 21 CFR. Cosmetic guidance: up to 10% glycolic/lactic acids at pH ≥3.5 with Sunburn Alert advisory. Above 10% or pH <3.5 may be classified as drug rather than cosmetic. Non-sensitising at cosmetic levels per CIR Expert Panel (1998).
Pakistan DRAP
No specific restriction on lactic acid in cosmetic products under DRAP Cosmetics Rules 2005. Pakistani formulators have flexibility but are advised to follow EU/CIR safety parameters as best professional practice. Products at ≤10% pH ≥3.5 with SPF advisory are appropriate for domestic market.
Halal Status — Conditional
Lactic acid produced by bacterial fermentation (Lactobacillus species) of plant-derived sugars (corn glucose, beet sucrose, cassava starch) is fully halal — no pork-derived enzymes, no haram-source ethanol, no animal slaughter products in the process. Major halal bodies (JAKIM, IFANCA, HFA, Pakistan Halal Authority) confirm plant-fermentation origin as halal. Dairy-derived lactose feedstock requires separate halal verification. Bio Shop™ sources from plant-fermentation manufacturers with traceability documentation.
UV Sensitivity Advisory
AHAs including lactic acid temporarily increase UV sensitivity by removing protective stratum corneum layers. All AHA products must include SPF advisory: "Use broad-spectrum sunscreen daily when using this product." This is a skin response, not ingredient phototoxicity — lactic acid itself is not photosensitive or phototoxic.
Environmental & Biodegradability
Lactic acid is a naturally occurring organic acid produced by all living organisms during anaerobic metabolism. Readily biodegradable. No bioaccumulation concern. No aquatic toxicity at any relevant concentration. Environmentally benign — one of the most eco-friendly cosmetic actives available.
Storage Guidelines
Handling & Storage
Temperature
Below 25°C sealed; stable to 40°C short-term. Remains liquid at all Pakistan temperatures (freezing point far below 0°C).
Container Type
HDPE or glass containers. Avoid reactive metals (iron, aluminium) — lactic acid is corrosive to carbon steel. Use stainless steel or plastic for bulk.
Light Exposure
Not photosensitive but UV may promote minor colour development over time. Store in amber glass or opaque HDPE away from direct sunlight.
Shelf Life
36–48 months sealed from manufacture. 18–24 months once opened. Keep tightly sealed to prevent concentration change from water evaporation.
Measuring Technique
Wear gloves and eye protection — 88% grade is strongly acidic (pH ~0.6 undiluted). Use glass or stainless steel measures. Precision: ±0.1g for active formulations.
Pre-use Handling
88% grade is ready to use — add to water phase at ≤45°C. Never add to hot phase (>60°C) as it causes foaming in surfactant systems. Mix well, measure pH immediately.
Lahore Storage
Stable across all Lahore seasonal temperatures. Summer heat (45°C+): store in inner room or air-conditioned area. Never leave in vehicles. The 88% grade may concentrate slightly if left open in extreme heat — always keep tightly sealed between uses.
Karachi Storage
Coastal humidity does not affect sealed lactic acid — primary concern is temperature. Cool, shaded indoor room away from direct sunlight. Avoid sea-breeze windows (metal lids may rust). Use plastic-capped HDPE containers for long-term storage.
Adulteration Check: 1% aqueous solution pH should be 2.4–2.8 — above 3.5 indicates dilution. Density should be 1.18–1.21 g/mL at 20°C. Vinegar smell indicates acetic acid adulterant. Material thinner than expected = water dilution. Always request CoA with assay % from Bio Shop™.
Frequently Asked Questions
Expert Answers
Is lactic acid halal? What is its exact origin?
Lactic acid\'s halal status depends on the fermentation feedstock. Commercial cosmetic-grade lactic acid is produced by bacterial fermentation (using Lactobacillus species) of plant-derived carbohydrates — predominantly corn-derived dextrose, sugar beet sucrose, or cassava starch hydrolysate. When produced from these plant sources, lactic acid is fully halal: no pork-derived enzymes, no alcohol from haram sources, no animal slaughter products at any stage of the process. Major Islamic certification bodies (JAKIM, IFANCA, HFA, Pakistan Halal Authority) confirm plant-fermentation origin as halal. If the feedstock is dairy-derived lactose, the halal status depends on the halal certification of the dairy supply. Bio Shop™ Pakistan sources from manufacturers using plant-based feedstocks with documentation available upon request.
How do I verify purity of lactic acid when buying in Pakistan?
Three practical quality checks: (1) pH test — dissolve 1g in 99g distilled water, measure with calibrated meter. Genuine 88% lactic acid gives pH 2.4–2.8; above 3.5 indicates dilution or adulteration. (2) Density check — genuine 88% grade has density 1.18–1.21 g/mL at 20°C. Weigh 100mL in a graduated cylinder. (3) Odour test — genuine lactic acid has a mild, characteristic sour-milky odour; a vinegar or sharp chemical smell indicates acetic acid adulterant. For formal verification, request a Certificate of Analysis with assay confirmed by HPLC or titration. Purchase from Bio Shop™ for verified cosmetic-grade material with CoA documentation.
How should I store lactic acid in Pakistan — Karachi and Lahore specifics?
Lactic acid 88% is chemically stable across Pakistan\'s climate when stored properly. For Karachi (coastal, humid): the sealed container prevents moisture absorption, so humidity is not the issue — temperature is. Store in a cool, shaded indoor room away from direct sunlight and sea-breeze windows. Use plastic-capped HDPE containers (metal lids may rust in coastal air). For Lahore (extreme seasonal heat): lactic acid remains liquid at all Lahore temperatures. In summer (45°C+), keep in an inner room or air-conditioned storage area. Never leave in vehicles. Always keep tightly sealed between uses to prevent water evaporation from the 88% grade. Shelf life sealed: 36–48 months at <25°C.
What is the correct use level? Can I use more for stronger results?
For daily-use consumer formulas: 0.5–1.5% at pH 4.5–5 provides safe, gentle exfoliation with NMF humectancy. For targeted treatments: 2–5% at pH 3.5–4.5 delivers meaningful brightening and texture improvement. Up to 10% is acceptable for consumer AHA peels (with SPF advisory and timed application). For foot creams: 10–20% is appropriate for thick keratinised foot skin. The EU SCCNFP precautionary recommendation is ≤2.5% at pH ≥5 for leave-on; the CIR/FDA support up to 10% at pH ≥3.5. Going above 10% in leave-on face products without professional oversight is not recommended — irritation, PIH, and UV sensitivity risk increases significantly. Remember: 88% grade = 88g active acid per 100g material — adjust calculations accordingly.
Is lactic acid safe for South Asian / brown skin types?
Lactic acid is among the safest and most appropriate AHAs for South Asian (Fitzpatrick III–VI) skin. Its larger molecular size compared to glycolic acid means slower, more controlled penetration and lower irritation risk — critical because irritation in darker skin tones frequently triggers post-inflammatory hyperpigmentation (PIH), the very concern the exfoliant is meant to address. Safety rules for Pakistani skin: (1) start at 0.5–1%, build gradually over 4–8 weeks; (2) maintain moisturisation alongside exfoliation; (3) always use SPF 30+ during use; (4) patch test 24 hours before full application; (5) avoid combining with retinol initially until tolerance is established. Properly formulated, lactic acid is not only safe but actively beneficial for hyperpigmented South Asian skin.
Can I combine lactic acid with niacinamide?
Yes — lactic acid and niacinamide are a highly effective and generally safe combination, representing the most commercially validated brightening duo for South Asian skin. Niacinamide is stable at pH 4–7, and lactic acid at pH 4.5–5 is within compatibility range. The combination provides complementary mechanisms: AHA exfoliation accelerates removal of pigmented cells, while niacinamide inhibits melanosome transfer to keratinocytes. The concern about niacin flushing occurs mainly at very low pH (<3.5) during manufacturing, not in stable finished products at pH 4.5–5. Caution: those with rosacea should use gentle pH (4.8–5.2) and low LA concentration (≤1%) with niacinamide.
Does lactic acid help with Pakistan-specific skin concerns — fairness, acne marks, oiliness?
Fairness/brightening (nikhar): Yes — clinically validated for improving skin luminosity by accelerating shedding of melanin-containing corneocytes. The ethical, safe alternative to hydroquinone. Acne marks (PIH): Yes — one of the most effective consumer-available ingredients for post-acne dark marks; requires 4–8 weeks of daily use. Best combined with niacinamide. Oiliness: Moderately effective for texture and pore appearance; combine with zinc PCA or niacinamide for direct sebum reduction. Foot dryness: Excellent at 10–15% for cracked heels and callused feet — a major unmet need in Pakistan. Scalp build-up: Effective scalp exfoliant at 1–2% in shampoo, removing product build-up from heavy hair oiling.
Which product format suits Pakistani consumers best for lactic acid?
For brightening (most common purchase driver): leave-on toner or serum (30–60mL) at 1.5–3% lactic acid + niacinamide, pH 4–4.8. The toner format — water-thin, applied with cotton pad — is ideal for Pakistan\'s hot, humid climate where heavier textures feel uncomfortable. For foot care: thick cream (10–15% LA) in 100–200g tube — a massively underserved category. For body exfoliation: lotion format (5–8% LA) applied after shower. For scalp health: pre-shampoo essence or clarifying shampoo using Shampoo Base. The face serum/toner is the highest-margin, highest-repeat-purchase category. Price positioning: PKR 500–900 per 30–60mL is within the aspirational-accessible range for Lahore and Karachi urban consumers.
Full Reference Document
Dive Deeper — Read the Complete Guide
The complete Lactic Acid technical dossier covers advanced formulation strategies, detailed skin science mechanisms with clinical study references, concentration–effect relationships by skin type, regulatory comparison across EU/FDA/DRAP, and comprehensive market analysis for Pakistani cosmetic entrepreneurs.
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