Glycolic Acid

✦ Most effective alpha hydroxy acid for chemical exfoliation due to its smallest molecular size among AHAs
✦ Accelerates cell turnover to visibly reduce dark spots, acne scars, and uneven skin tone
✦ Stimulates collagen production at appropriate concentrations for anti-aging benefits
✦ Water-soluble and easy to formulate into serums, toners, peels, and cream-based products
✦ Effective across a wide concentration range from gentle daily-use toners to professional-strength peels
✦ Derived from sugarcane, making it a naturally sourced cosmetic active
✦ Clinically studied ingredient with decades of proven performance in dermatological and cosmetic applications

Glycolic Acid is an alpha hydroxy acid naturally found in sugarcane juice. It has been used in cosmetic and dermatological applications since the early 1990s when researchers established AHAs as safe and effective chemical exfoliants. Today it remains the gold-standard AHA in professional skincare formulations worldwide.

What makes Glycolic Acid uniquely effective is its molecular weight of just 76.05 g/mol, the smallest of any AHA. This allows it to penetrate the stratum corneum more efficiently than lactic, mandelic, or tartaric acid. Once absorbed, it disrupts ionic bonds between corneocytes, promoting desquamation and revealing newer skin cells. At concentrations above 10%, it also reaches the dermal layer where it stimulates glycosaminoglycan and collagen synthesis.

Rabibazaar supplies cosmetic-grade Glycolic Acid suitable for DIY skincare formulators, professional aestheticians, cosmetic brand developers, and home crafters.

INCI Name : Glycolic Acid
Chemical Name : 2-Hydroxyacetic Acid
CAS Number : 79-14-1
Molecular Formula : C2H4O3
Appearance : White crystalline powder (solid) or clear colorless liquid (70% solution)
Odor : Odorless
pH (1% solution) : 2.0 to 3.0
Solubility : Freely soluble in water, ethanol, and methanol
Specific Gravity : 1.27 (70% aqueous solution)
Flash Point : Not Applicable (aqueous solutions)
HLB Value : Not Applicable
Recommended Use Level : 2% to 10% (leave-on products); up to 30% (professional peels)
Type : Alpha Hydroxy Acid / Chemical Exfoliant
Shelf Life : 24 months when stored properly

Skincare (Serums, Toners, Peels) ★★★★★
Glycolic Acid is most effective in water-based skincare products where its exfoliating action is fully utilized. Use at 5% to 8% in daily serums with a buffered pH of 3.5 to 4.0 for safe at-home exfoliation.

Haircare (Scalp Treatments, Clarifying Rinses) ★★★☆☆
Glycolic Acid can clarify the scalp by removing product buildup and dead skin flakes. Limit to 2% to 4% in rinse-off scalp treatments and always follow with a conditioner.

Soap Making (Cold Process, Melt and Pour) ★★☆☆☆
AHAs are not well-suited to soap making as the high pH of saponification neutralizes the acid entirely. If desired for marketing value, add to melt-and-pour bases at very low levels knowing efficacy will be minimal.

Body Care (Body Lotions, Exfoliating Treatments) ★★★★☆
Glycolic Acid works well in body lotions targeting rough skin on elbows, knees, and heels. Use at 5% to 10% in body lotions formulated at pH 3.8 to 4.2.

Professional Aesthetic Treatments (Chemical Peels) ★★★★★
At 20% to 30% concentration and pH below 3.0, Glycolic Acid functions as a professional-grade chemical peel. These concentrations require precise neutralization protocols and should only be used by trained formulators or aestheticians.

In my formulation work, I always treat Glycolic Acid as a pH-dependent active rather than a concentration-dependent one. A 10% Glycolic Acid serum at pH 4.5 will be far gentler than a 5% serum at pH 2.5 because the proportion of free acid available for penetration drops dramatically as pH rises. This means your pH adjustment strategy determines the product's efficacy more than the percentage on the label. I always formulate my daily-use Glycolic products between pH 3.5 and 4.0 to balance effectiveness with tolerability.

ADVANCED TIP: To create a buffered Glycolic Acid serum that is effective yet gentle, dissolve Glycolic Acid at 8% into your water phase, then partially neutralize with sodium hydroxide (10% solution) until pH reaches 3.8. This converts roughly 40% of the free acid into sodium glycolate, which still provides mild exfoliation while significantly reducing irritation. The partially neutralized system also improves long-term stability.

Normal Skin : ★★★★★ — Tolerates Glycolic Acid well and benefits from improved radiance and texture.
Dry Skin : ★★★★☆ — Enhances cell turnover and improves moisturizer absorption, but may increase dryness if overused.
Oily Skin : ★★★★★ — Excellent for unclogging pores and reducing sebum-related dullness.
Combination : ★★★★☆ — Works well on the oily T-zone but apply cautiously on drier cheek areas.
Sensitive Skin : ★★☆☆☆ — High irritation risk; use only at low concentrations with proper buffering or choose mandelic acid instead.
Mature Skin : ★★★★★ — Collagen-stimulating properties make it ideal for fine lines, age spots, and overall renewal.
Acne-Prone : ★★★★☆ — Promotes desquamation that helps prevent pore blockage, but may cause initial purging.

CONCEPT 1: Daily Glow Exfoliating Serum
Usage Level : 7%
Key Ingredients: Niacinamide, Hyaluronic Acid, Aloe Vera Extract
Result : A lightweight water-based serum that gently exfoliates daily while hydrating and brightening the complexion.

CONCEPT 2: Overnight Renewal Cream
Usage Level : 5%
Key Ingredients: Shea Butter, Squalane, Allantoin, Cetearyl Alcohol
Result : A rich night cream that accelerates cell turnover while the skin repairs overnight, reducing fine lines and dark spots.

CONCEPT 3: Professional Brightening Peel
Usage Level : 25%
Key Ingredients: Lactic Acid (5%), Witch Hazel Distillate, Glycerin
Result : A professional-strength bi-weekly peel that dramatically improves hyperpigmentation and skin texture in controlled application sessions.

INCI Declared : Yes — required in all cosmetic products
EU Cosmetics Reg : Permitted — Annex III restricts to 4% in ready-to-use products for consumers; higher concentrations for professional use only
Rinse-Off Limit : 4% for consumer products (EU); up to 30% for professional use
Leave-On Limit : 4% for consumer products (EU); final product pH must not be below 3.5
Allergen Alert : No — not a classified allergen, but irritation and sensitization possible at high concentrations
Skin Safety : Safe at recommended levels when pH is properly controlled; patch test advised for sensitive individuals
Eye Area Use : Avoid — causes significant irritation to the periorbital area and mucous membranes
Ingestion : Not for internal use
Pregnancy Use : Consult physician — high concentration peels are generally avoided during pregnancy
Child Safety : Avoid for children under 12; use only diluted and under supervision for teens
Ventilation : Recommended when handling powder form to avoid inhalation of fine particles
Storage : Cool dry place away from direct sunlight; keep tightly sealed
Container : HDPE or glass; avoid reactive metals such as aluminum

⚠️ Glycolic Acid at any concentration requires careful pH control. Products with pH below 3.5 significantly increase the risk of irritation, chemical burns, and post-inflammatory hyperpigmentation, especially on darker skin tones. Always include usage instructions and sunscreen advisory on product labels, as AHAs increase photosensitivity.

Working pH Range : 2.0 to 4.5 (most effective between 3.0 and 4.0)
Heat Stability : Stable up to 80°C; can be added to hot or cold phase
Freeze-Thaw Stable : Yes
Emulsion Type : Not applicable — water-soluble active, dissolves in aqueous phase
Emulsification Phase: Water phase
Compatible With : Hyaluronic Acid, Niacinamide (at proper pH), Allantoin, Glycerin, most aqueous humectants
Incompatible With : Strong bases (neutralize the acid), Retinol at very low pH (mutual degradation risk), soap-based systems, highly alkaline preservatives
Oxidation Risk : Low — Glycolic Acid is chemically stable and not prone to oxidation
Discoloration Risk : None — does not cause discoloration in formulations
Formulation Notes : Always add Glycolic Acid to the water phase and adjust pH after all ingredients are incorporated. When combining with Niacinamide, ensure final pH is above 3.5 to prevent niacinamide from converting to niacin, which causes flushing.

Q: What percentage of Glycolic Acid should a beginner use in DIY skincare?
A: Start with 5% in a toner or serum formulated at pH 3.8 to 4.0. This provides noticeable exfoliation with minimal irritation risk. Increase concentration gradually after your skin builds tolerance over several weeks.

Q: Does Glycolic Acid make the skin more sensitive to sun?
A: Yes, all AHAs including Glycolic Acid increase photosensitivity by thinning the outermost layer of dead skin cells. Always include a broad-spectrum sunscreen recommendation on any product containing Glycolic Acid, and advise users to apply it in the evening routine.

Q: Can I combine Glycolic Acid with Vitamin C in the same product?
A: It is possible but not recommended for beginners. Both are low-pH actives and combining them increases irritation potential significantly. Professional formulators may layer them in separate products, using Vitamin C in the morning and Glycolic Acid in the evening.

Q: What is the difference between Glycolic Acid powder and the 70% liquid solution?
A: The powder form is pure Glycolic Acid and requires careful weighing and dissolution in water. The 70% solution is pre-dissolved and easier to handle for most formulators. Both achieve the same results, but the solution simplifies pH adjustment and reduces handling risks.

Q: How does Glycolic Acid compare to Lactic Acid for exfoliation?
A: Glycolic Acid has a smaller molecular weight, so it penetrates deeper and exfoliates more aggressively than Lactic Acid. Lactic Acid is gentler, more hydrating, and better suited for sensitive or dry skin. For maximum exfoliation and anti-aging results, Glycolic Acid is the superior choice; for mild brightening with less irritation, Lactic Acid is preferred.

Product evaluation

Review the specifications, supplied grade, intended use and compatibility of Glycolic Acid before ordering for production. Test a small quantity in the actual application and document the result before scaling.

Quality control

Inspect the received batch for expected appearance, odor, texture, packaging condition and labeling. Keep supplier and batch records, use accurate measurements, and retain a reference sample when the material is used commercially.

Storage and responsible use

Store tightly closed in a clean, cool and dry location away from direct sunlight. Follow the current supplier instructions and all safety, labeling and regulatory requirements that apply to the intended finished product.