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AHA glycolic acid toner OEM/ODM manufacturing
AHA Glycolic Acid Toner · OEM/ODM
Glycolic acid is often marketed as a “fruit acid”, but every production route recorded in PubChem is chemical synthesis. What really sets it apart is size: the molecule has only two carbon atoms (molecular weight 76.05) and dissolves very readily in water, which makes it a natural fit for a toner. AHA products loosen the surface layer of corneocytes, leaving skin smoother and less dull; how strongly depends on the type of acid, its concentration, the pH and the base (FDA). Human evidence at home-use levels includes a double-blind trial in 74 women (three arms: 8% glycolic acid cream, 8% lactic acid cream, vehicle cream) over 22 weeks and a double-blind placebo-controlled trial in 120 people with mild acne using a 10% pH 4 emulsion for 90 days — both creams or emulsions; the sources we checked contain no trial in toner form. The trade-off is that glycolic acid makes skin more sensitive to UV during use, returning to normal about a week after stopping. That is why, in ASEAN, glycolic acid sits in Annex III entry A6: skin products for general use may contain at most 10% calculated as the acid, the final pH must be at least 3.5, and the label must carry a sunburn alert from 2.5% when the product contains no sunscreen. A Butter-C AHA toner starts from three numbers — total level, pH and free acid — and only then moves to skin feel. Butter-C offers full-service OEM/ODM manufacturing, from formulation to a labeled finished product with its notification dossier.
Formula base
Glycolic acid is the axis; everything else is arranged around pH
A toner is almost all water, so nothing masks the glycolic acid. The acid raw material, the neutralizer and the humectants are chosen together, because all three set the final pH.
Glycolic acid — the named ingredient
INCI Glycolic Acid. Commercial grades come as crystals or solutions (often 70%), with assay varying by supplier — the formula percentage is always converted to pure acid using the certificate of analysis (COA). Levels tested in humans in home-use products: 8% (cream) and 10% at pH 4 (emulsion). The “7%” often seen on the market is a positioning choice, not a level with its own trial in the sources we checked.
Neutralizer and buffer
Sodium Hydroxide partially neutralizes glycolic acid to reach the target pH; a Lactic Acid – Sodium Lactate pair can serve as the buffer. Glycolate and lactate salts still fall under entry A6 and count toward the total calculated as the acids: neutralizing lowers free acid, not the “total”.
Companion AHAs (optional)
Lactic Acid shares entry A6 with glycolic acid — both count against one 10% ceiling; human data exist at 5–12% (12% is above the retail ceiling). Mandelic Acid is not in entry A6 and has no specific limit in the ASEAN annexes — its level must be justified by the manufacturer’s safety assessment; in one human comparison it caused less redness and photosensitivity than 10% glycolic acid.
Humectants that tolerate acidic pH
Glycerin, Butylene Glycol and Betaine help skin feel less tight. Panthenol and Allantoin are stable from pH 4 upward according to our ingredient monographs, so they are added only when the final pH is set at 4 or above and are tracked through stability testing. No fragrance, and no BHA or retinoid in the same bottle.
Key technical points
Four numbers to settle before discussing skin feel
Two toners both labeled “glycolic acid 8%” can act on skin very differently. The four items below determine efficacy, comfort and whether the notification dossier holds up.
Total AHA calculated as the acids
Annex III entry A6 covers “Glycolic and lactic acid, their common salts and simple esters”: skin products for general use, “≤ 10% total when calculated as the acids”. The total includes glycolic acid, lactic acid, the salt formed on neutralization and any added Sodium Lactate (1% anhydrous sodium lactate equals about 0.80% lactic acid). Mandelic acid and gluconolactone are outside this entry.
Final pH and free acid
The final formulation must be “≥ pH 3.5”. Glycolic acid has a pKa of 3.83, so the share present as free (undissociated) acid falls as pH rises — estimated with the Henderson–Hasselbalch equation: about 68% at pH 3.5, 40% at pH 4.0, 18% at pH 4.5. These figures are for comparing options only (they ignore concentration and base effects); choosing the pH balances activity, stinging and stability of the base.
A toner is not a cream
The FDA notes that a cosmetic-type cream base lets AHAs penetrate further than a simple solution — changing the base means re-assessing irritation. The 8% and 10% efficacy data come from creams and emulsions and do not transfer directly to a toner; the toner’s level is set through tolerance testing on the finished product itself.
UV sensitivity and the warning text
In a double-blind controlled trial in 29 people, 10% glycolic acid at pH 3.5 applied for 4 weeks increased sunburn cells and lowered the UV dose that causes redness; the effect disappeared one week after stopping (Kaidbey 2003). Annex III footnote (13): “Labeling mandatory for products containing Glycolic and/or Lactic acids at a concentration ≥ 2.5% and do not contain a sunscreen.” An AHA toner usually contains no sunscreen, so from 2.5% the warning must be printed. The footnote does not say how salts are counted; Butter-C adds glycolate and lactate salts (converted to acid) when comparing against the 2.5% threshold — a cautious reading that needs confirmation by regulatory review.
Three formulation directions
Three ways to put glycolic acid in a toner bottle
Single-AHA glycolic toner
Glycolic acid alone, with no other AHA, partially neutralized with Sodium Hydroxide to around pH 4 — the pH of the 10% emulsion trial. A short formula that is easy to explain on the label; for normal and oily skin already used to actives. The label carries the sunburn alert.
Glycolic–lactic toner with a lactate buffer
Lactic Acid and Sodium Lactate are added to limit pH drift over time; lactic acid is described as supporting moisture. Everything in entry A6 shares one 10% ceiling calculated as the acids. For combination and slightly dry skin wanting a softer feel.
Low-level glycolic toner for beginners
Glycolic acid below 2.5% (salts included, converted to acid — a cautious reading), optionally with Mandelic Acid. Below the footnote (13) threshold the warning is not mandatory, but the U.S. FDA still recommends a sunburn alert label for cosmetics containing AHAs — Butter-C advises keeping sun-protection advice. The sources we checked have no human efficacy data at this level — claims stay at gentle smoothing and must be tested on the finished product.
Packaging is designed with the formula
Acid-resistant plastic bottles (such as HDPE) with an orifice reducer for cotton-pad use; avoid metal tools and packaging that do not resist acid. Bottle, cap and liner are soaked with the sample during stability testing in the actual commercial packaging.
Parameters we monitor
What our R&D lab measures on every sample
Below are the parameters Butter-C tracks during formulation and scale-up. Specific limits are agreed with you on the approved sample and then written into the product’s in-house specification.
- pH
- Measured directly at 25°C on every batch; the in-house pH range keeps a margin above the mandatory 3.5. pH drift is tracked at each stability time point.
- AHA content
- Glycolic acid (and lactic acid if present) assayed by HPLC at the start and after stability testing; the A6 total calculated as acids, including salts, is kept in the dossier.
- Sensory profile & clarity
- Color, odor and clarity compared with the reference sample. Haze is checked after storage at 4°C.
- Density & conductivity
- Two quick batch-identity indicators for an all-water system, catching mixing errors.
- Stability
- Accelerated aging at 40°C, freeze–thaw cycling and light exposure; tracking pH, AHA content, color and clarity.
- Packaging compatibility
- Filled into the actual bottle, cap and liner; checked for deformation, material odor and corrosion of any metal parts.
- Microbiology & challenge test
- Tested at a GLP / ISO 17025-accredited laboratory; preservative efficacy (challenge) test per ISO 11930 — a low pH does not replace the preservative system.
- Stinging & irritation
- Testing on human volunteers, including facial stinging; the basis for fixing level and pH before the production run.
- Label check
- Total AHA, pH and the sunburn alert are checked against Annex III entry A6 before the label artwork is approved.
Claims
Writing claims within cosmetic scope
Many glycolic acid studies cover 35–70% peels performed by physicians, or studies in people with acne or melasma — marketing copy easily slides into that language. A retail toner stops at exfoliation and smoothing. Butter-C reviews label and marketing wording as soon as the notification dossier is prepared.
Exfoliates, helps the skin surface feel smoother
Instead of: peels the skin, skin renewal, “at-home peel”.
Helps skin look brighter and less dull
Supported by the 8% cream trial (less dullness on the forearms versus the vehicle cream); for a toner it must be tested on the finished product. Instead of: whitening, erases dark marks, removes melasma.
Suitable for oily, blemish-prone skin
Describes the skin type; the 10% pH 4 emulsion study in people with mild acne is a medical context and does not become a claim. Instead of: claims about acne, clears acne, unclogs pores.
Contains glycolic acid, with a percentage
A percentage is stated only when it is the total calculated as the acid and matches the assay; pH may be stated alongside. Instead of: percentages with no stated basis, figures above 10% on retail products.
Mandatory warning
Verbatim from Annex III: “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 sun protective clothing, and limit sun exposure while using this product and for a week afterwards.” The local-language label carries an equivalent translation approved by regulatory review. Instead of: “does not cause sun sensitivity”, dropping the warning because part of the level is “only a salt”.
Directions and label cautions
Use in the evening, starting every other day; do not use on broken skin, after shaving or hair removal, or on sunburned skin; use retinol, BHA and acidic vitamin C at a different time; stop if redness or burning persists. Instead of: suitable for all skin types, safe during pregnancy.
Manufacturing specifications
Available capabilities
- Texture
- Clear, colorless liquid; can be very slightly thickened with a polymer that tolerates acidic pH.
- Format
- Acid-resistant plastic bottle with orifice reducer or flip-top cap. Volume agreed when selecting packaging.
- Minimum order quantity
- Agreed per order — depends on the formulation direction and format chosen.
- Testing
- At a GLP / ISO 17025-accredited laboratory, with AHA assay and pH on every batch; the certificate of analysis is delivered with each batch.
- Dossier
- Product Information File (PIF) and cosmetic product notification dossier prepared by Butter-C, including the A6 total-AHA calculation and irritation test results.
- Packaging
- Label design, printing and packing run in parallel with formulation; the sunburn alert is laid out from the first label draft.
Suggested product concept
Buffered glycolic acid toner for oily and combination skin
A concept to help you picture the product, not a ready-made product for sale. The actual formula is built around your brand’s positioning and price range.
Partially neutralized glycolic acid, pH around 4
The named ingredient; the A6 total stays within 10% calculated as the acid, with the exact level set by stinging and tolerance tests, referencing the 8–10% levels tested in creams and emulsions.
Glycerin, Betaine, Allantoin
Humectants and soothing agents alongside the acid; Allantoin only when the final pH is 4 or above.
No fragrance, no alcohol, no BHA or retinoid
A short ingredient list so glycolic acid is the star and tolerance is easy to assess.
150 ml acid-resistant plastic bottle with orifice reducer
For cotton pad or hands; the label carries the sunburn alert, evening-use directions and daytime sunscreen advice.
Customization options
What you can specify
The same product type can target very different customers. Tell us your requirements in the areas below and our pharmacists will build the formula accordingly.
Sales channel and level
Retail: total up to 10%, pH from 3.5. Above 10% up to 20% is a professional-use product (pH from 3.0, label “For professional use only”); the channel must be defined before development.
Companion AHAs
Glycolic acid alone, plus lactic acid, or plus mandelic acid — this determines how the A6 total is calculated and the label wording.
pH and stinging level
The closer the pH is to 3.5, the more free acid and the more likely stinging; raising pH feels gentler but lowers activity.
Humectants and soothing agents
Glycerin, Betaine, Butylene Glycol, Sodium Lactate, Allantoin, Panthenol — selected according to the final pH.
Fragrance and color
We recommend no fragrance and no colorant for a leave-on acid product for the face.
Ingredient direction
Alcohol-free, fragrance-free, paraben-free, vegan — please state these from the start so we can select suitable ingredients.
Further reading
Related knowledge
Glycolic acid in cosmetics
Mechanisms, human trials, the ASEAN 10% and pH 3.5 limits, sun sensitivity (in Vietnamese).
Lactic acid in cosmetics
The other AHA in entry A6: L and DL forms, moisture support, how the total is calculated (in Vietnamese).
Mandelic acid in cosmetics
A larger AHA outside entry A6; evidence is still limited (in Vietnamese).
Sodium lactate in cosmetics
Lactate buffers, conversion to acid and free-acid share by pH (in Vietnamese).
UVA, UVB, visible light and their effects on skin
Why AHA users need sun protection during and after use (in Vietnamese).
Toner manufacturing
General page: hydrating, balancing and exfoliating toners.
Facial exfoliator manufacturing
A different route: particles, enzymes, gommage gels and rinse-off products.
How we work
From idea to finished batch
Eight steps and three milestones signed off by both sides: approved sample, notification number, finished batch. Step-by-step details (in Vietnamese) →
Get started
Tell us about the product you plan to launch
Send us your product direction and expected volume. Our team will get back to you during business hours (Vietnam time, GMT+7).
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