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Glycolic Acid
ORY® product lines:
☑ Skincare
☑ Haircare (scalp exfoliants, clarifying and smoothing treatments)
☒ Handmade Soap (neutralized by lye)
☑ Cosmetics (limited: exfoliating primers, acid pads, body makeup prep)
Glycolic acid is the smallest alpha-hydroxy acid (AHA), originally derived from sugarcane and today produced synthetically to cosmetic purity. Its tiny molecule penetrates the stratum corneum quickly, where it loosens the bonds between dead cells to reveal smoother, brighter skin. Clinical and histological studies show that regular use thickens the living epidermis, increases dermal collagen and glycosaminoglycans, and improves fine lines and pigmentation [1, 2]. The Cosmetic Ingredient Review Panel considers glycolic acid safe in leave-on cosmetics at up to 10% with a pH of 3.5 or higher, and in professional peels up to 30% at pH 3.0 or higher [4]. Because it increases sun sensitivity, daily sunscreen is essential.
What is Glycolic Acid made of?
Glycolic acid (C₂H₄O₃, hydroxyacetic acid) is the simplest AHA. Points to know:
- Natural origin: Found in sugarcane, sugar beets, and unripe grapes; commercial cosmetic grades are synthesized for purity and are chemically identical.
- Small molecular size: Lower molecular weight than lactic, mandelic, or citric acid, giving the fastest penetration — and the highest irritation potential — of the common AHAs.
- pH-dependent activity: The free-acid form does the exfoliating; formulators adjust pH (typically 3.5–4.0) to balance efficacy and tolerance [3].
- Water-soluble: Added to the water phase of toners, serums, gels, and lotions.
What skin type is best suited for Glycolic Acid?
Glycolic acid suits resilient skin best; sensitivity dictates the concentration and frequency:
- Oily: Excellent — clears surface debris, refines pores, and reduces dullness.
- Acne-prone: Reduces comedones and post-inflammatory marks; pairs well with salicylic acid for pore-level action.
- Mature: Improves fine lines, roughness, and sun spots; histological studies show thicker epidermis and increased collagen [1, 2].
- Combination: Use on the T-zone or at low concentration overall.
- Normal: Weekly to twice-weekly use maintains brightness.
- Dry: Use low concentrations (5%) in a moisturizing base; AHAs also act as humectants.
- Sensitive: Generally choose lactic or mandelic acid instead; if used, 5% or less, buffered with allantoin, panthenol, or Centella.
What hair type is best suited for Glycolic Acid?
In haircare, glycolic acid serves two roles: scalp exfoliation and hair-fiber smoothing. Its small size allows it to penetrate the cuticle, and low-pH acid treatments help flatten and seal the cuticle for shine:
- Oily scalp: Clarifying scalp treatments dissolve sebum and product buildup.
- Dandruff-prone scalp: Exfoliates flakes; use alongside salicylic acid or tea tree oil.
- Straight: Acidic rinses and treatments enhance shine and reduce frizz by closing the cuticle.
- Wavy and curly: Clarifies buildup from styling products that weigh curls down.
- Coily: Use sparingly — pre-shampoo scalp treatments only; follow with rich conditioning.
- Color-treated or chemically processed: Low-pH acid treatments help seal the cuticle after chemical services (avoid the first 48 hours after coloring).
- Dry or damaged, Sensitive scalp, Mature or thinning: Use at low levels (1–2%) or choose lactic acid; over-exfoliation can worsen dryness.
What are the benefits of Glycolic Acid?
Glycolic acid delivers some of the most visible results in over-the-counter skincare [1, 2, 3]:
- Exfoliation: Dissolves the desmosome bonds holding dead cells, revealing smoother, brighter skin.
- Anti-aging: Increases epidermal thickness, dermal collagen, and hyaluronic acid content; reduces fine lines [1, 2].
- Brightening: Fades sun spots, melasma, and post-acne marks by speeding turnover of pigmented cells.
- Pore refinement: Clears debris from pore openings, reducing the appearance of enlarged pores.
- Humectant: Like all AHAs, it attracts water, improving hydration at low concentrations.
- Enhances absorption: Improves penetration of subsequent actives.
- Scalp and hair: Removes scalp buildup and, at low pH, closes the cuticle for smoother, shinier hair.
Dual use across ORY® product lines
Glycolic acid is a water-phase active whose function depends on staying acidic. It works in skincare, scalp care, and some cosmetics, but is chemically neutralized in cold-process soap.
| ORY® line | Dual use? | How it is used | Typical level |
|---|---|---|---|
|
ORY® Skincare |
Yes |
Exfoliating toners, serums, night creams, body lotions, peel masks (pH 3.5–4.0). |
5–10% leave-on; up to 30% rinse-off peel |
|
ORY® Haircare |
Yes |
Scalp exfoliating serums/scrubs, clarifying shampoos, acidic smoothing rinses and cuticle-sealing treatments. |
1–5% scalp; 2–7% rinse-off treatments |
|
ORY® Handmade Soap |
No |
Lye converts glycolic acid to sodium glycolate, eliminating exfoliation; soap pH (9–10) cannot support AHA activity. Use physical exfoliants (pumice, oatmeal) for a scrub bar instead. |
— |
|
ORY® Cosmetics |
Limited |
Exfoliating primers, acid pads, or makeup-prep treatments; not in pigmented base makeup (pH conflicts with pigments and emulsifiers). |
2–5% |
Pros and cons of Glycolic Acid
Pros
Cons
- Proven results: Strong clinical and histological evidence for anti-aging and brightening [1, 2].
- Fast-acting: Smoother texture within one to two weeks.
- Versatile concentration range: From gentle 5% daily lotions to professional 30% peels.
- Affordable: Low cost per gram.
- Multi-line: Effective for both skin and scalp/hair with the same raw material.
- Irritation: Stinging, redness, and peeling, especially above 10% or at low pH.
- Photosensitivity: FDA guidance recommends AHA products carry a sun-protection statement; daily SPF is required.
- Not for sensitive skin: Lactic or mandelic acid is a better first choice.
- pH constraints: Must be kept at pH ≥3.5 for safety and efficacy, which limits combination with some actives.
- Soap-incompatible: Cannot deliver exfoliation in a bar.
- Over-use risk: Combining with retinoids, vitamin C, or other acids in the same routine can compromise the barrier.
What is the best application of Glycolic Acid?
Glycolic acid should be introduced gradually and used at night:
- Toners: 5–7% pads or liquid toner 2–3 nights per week, increasing as tolerated.
- Serums: 8–10% for targeted brightening and anti-aging; apply after cleansing, before moisturizer.
- Night creams and body lotions: 5–10% in a hydrating base for rough, dull, or keratosis-pilaris-prone skin.
- Peel masks: 10–30% rinse-off once weekly or less.
- Scalp treatment: Apply a 2–5% serum to the scalp 10–20 minutes before shampooing, once or twice weekly.
- Acid hair rinse: A 2–3% rinse (pH 3.5–4) after conditioning to seal the cuticle and add shine.
- Pairing: Follow with hyaluronic acid and a barrier-supporting moisturizer; use retinol on alternate nights; always apply SPF 30+ in the morning.
Peer-reviewed references
- Ditre CM, Griffin TD, Murphy GF, et al. Effects of alpha-hydroxy acids on photoaged skin: a pilot clinical, histologic, and ultrastructural study. Journal of the American Academy of Dermatology. 1996;34(2):187–195.
- Tang SC, Yang JH. Dual effects of alpha-hydroxy acids on the skin. Molecules. 2018;23(4):863.
- Kornhauser A, Coelho SG, Hearing VJ. Applications of hydroxy acids: classification, mechanisms, and photoactivity. Clinical, Cosmetic and Investigational Dermatology. 2010;3:135–142.
- Andersen FA (Cosmetic Ingredient Review Expert Panel). Final report on the safety assessment of glycolic acid, ammonium, calcium, potassium, and sodium glycolates, methyl, ethyl, propyl, and butyl glycolates, and lactic acid, ammonium, calcium, potassium, sodium, and TEA-lactates, methyl, ethyl, isopropyl, and butyl lactates, and lauryl, myristyl, and cetyl lactates. International Journal of Toxicology. 1998;17(Suppl 1):1–241.
Disclaimer:
The information on this page is provided by ORY International, LC for educational purposes only. It summarizes published research about glycolic acid as an ingredient, including laboratory and animal studies and clinical studies of formulas that may differ from ORY® products. Results from these studies may not apply to every person or to ORY® products. This page is not medical advice and does not replace advice from a dermatologist, physician, or other qualified healthcare provider.
ORY® Skincare, Haircare, and Cosmetics products are cosmetics. They are not intended to diagnose, treat, cure, mitigate, or prevent any disease or condition, including acne, melasma, keratosis pilaris, sun damage, dandruff, or hair loss. References to FDA or Cosmetic Ingredient Review (CIR) findings describe the ingredient, not ORY® products, and do not mean FDA has reviewed or approved any ORY® product.
Sunburn Alert: This product contains an alpha hydroxy acid (AHA) that may increase your skin’s sensitivity to the sun and particularly the possibility of sunburn. Use a sunscreen, wear protective clothing, and limit sun exposure while using this product and for a week afterwards.
Results vary by skin and scalp type, formulation, and use. Glycolic acid can cause stinging, redness, or peeling, especially on sensitive or compromised skin, and any cosmetic can cause irritation, sometimes from other ingredients. Always patch test, follow label directions, and stop use if irritation occurs. If you are pregnant, nursing, have a medical condition, or are buying for a child, consult a healthcare provider before use.
ORY International, LC works to keep this page accurate and current but makes no warranty as to its completeness. To the fullest extent permitted by law, ORY International, LC is not liable for any loss or injury arising from reliance on this information or from use of any product contrary to its label directions. To report a reaction, contact us at [insert contact email / phone].
