Private Label Kojic Acid Serum
The fermentation-derived corrector — spot care with stability solved.
How a fluid is released, batch by batch
Filling runs in-house on GMPC and ISO 22716 certified lines under licence 粤妆20250206, with each batch traceable from raw material to carton.
Release reads the assay, the pH and the clarity, and compares the batch with the retained Golden Sample — colour and haze usually move before any assay reading does.
Stability and shelf-life questions
Why did my sample turn brown?
Plain kojic oxidizes — that is why we run chelator systems and opaque packs, or the dipalmitate ester that stays white through shelf life.
What level is compliant?
1–2% is the cosmetic norm across major markets; higher levels drift into drug territory in several jurisdictions.
Can it pair with retinol?
Yes at alternate dayparts; we formulate the pairing for brands that want a night A/B routine.
What gets decided before the preservative system
Solubiliser levels move the viscosity
The surfactant used to dissolve an oil-soluble active also changes the rheology of the base, sometimes markedly. The two are tuned together rather than one after the other.
Both ends of the pack's life
An airless pack keeps the product away from air, but it also changes how the last few grams are dispensed. The end of the pack's life belongs in the design as much as the first.
Compatibility between actives
Two actives that work alone can destabilise each other in the same bottle. Combinations are tested rather than assumed.
The dropper or the pump
Dispensing decides dose consistency and how much air the product meets in use. It is a formulation-adjacent choice, not just a packaging one.
How the system is locked before scale-up
- 1
Dissolve in order of solubility
Ingredients go in by solubility rather than convenience, since the order affects both dissolution and how the system behaves afterwards.
- 2
Verify against the retained sample
Assay, pH and appearance are checked at release against the sample your buyer approved.
- 3
Screen solubility at the cold end
The batch is cooled to the coldest shelf it will meet and checked for haze, which is where an overloaded solubiliser system shows itself.
- 4
Fix the active system
Routes and levels are set against the claim, then checked for compatibility with each other before the base is built.
Kojic acid serum serves the targeted spot-care shelf: fermentation-derived kojic acid (or its stabler ester, kojic dipalmitate) modulates the look of dark spots with a story customers read as 'Japanese skincare science'. The formulator's fight is oxidation — plain kojic discolors in bottle within weeks.
We solve stability two ways: dipalmitate ester builds for max shelf life, or plain kojic at 1–2% with chelator and opaque packaging systems. Both are validated through accelerated stability with colorimetric tracking.
Viscosity without weight is the whole craft of a fluid
A serum should feel like water and behave like a gel, and that combination is built with polymer choice and dosage rather than with more thickener. The two properties pull in opposite directions.
Push it one way and the product drips off the dropper; push it the other and it leaves a film on the skin. The sensory outcome of a fluid is decided in the rheology long before it is described on the pack.
Fluid routes and what each one has to protect
Each route below carries a different balance of preservative load, barrier requirement and sensory weight.
| Route | Barrier it needs | Where it fits |
|---|---|---|
| Structured gel | Chelator with no oil phase to protect | Treatment and gel-adjacent formats |
| Emulsion-fluid hybrid | A light oil phase suspended in water | Slip and comfort without the weight of a cream |
| Two-chamber or mix-at-use | Separated phases until activation | Actives that cannot hold a shelf life in solution |
| Simple aqueous | Chelator plus an opaque or UV-filtered pack | Stable actives in high-volume lines |
What you can change on this build
- Plain kojic vs. dipalmitate stability routes
- Opaque airless packaging to protect actives
- Spot-targeted rollerball format
- Color-stability data through shelf life
Build the routine around it
Private Label Alpha-Arbutin Serum
The gentle corrected cousin of a controversial molecule — brightening without the baggage.
Private Label Spot Treatment
The overnightblemish fixer — drying lotions and clear gels for the emergency-shelf slot.
Private Label Licorice Brightening Serum
The gentle brightener — root-derived glabridin for tone that evens quietly.
Buyer guides for this build
Before you brief a supplier on this category, these are the guides that answer the questions buyers ask next — timelines, order quantities, cost structure and compliance.
The functional system in this base
INCI names and typical levels reflect publicly documented formulation practice. All values are adjustable in your build.
| Ingredient (INCI) | Typical Level | Function & Benefit |
|---|---|---|
| Kojic Acid | 1–2% | Spot-look correcting |
| Kojic Dipalmitate | 1–3% | Oxidation-stable ester form |
| Alpha-Arbutin | 1–2% | Complementary tone support |
| Licorice Root Extract | 2% | Soothing brightening assist |
Formats and order quantities
Mixed-variant orders can split the stated MOQ across formats under one brand.
| Format / Specification | MOQ | Lead Time |
|---|---|---|
| Kojic dipalmitate 2% stable serum, 30 ml | 1,000 pcs | 10–15 days |
| Kojic acid 1% + arbutin spot build, 30 ml | 1,000 pcs | 10–15 days |
| Spot duo set (serum + spot treatment stick) | 1,000 sets | 10–15 days |
MOQ and lead time above are the standard liquid, cream and gel route. The real minimum is set by the manufacturing system rather than the category: surfactant systems (shampoo, body wash) start at 2,000 pcs, stick formats at 3,000, and powders and sheet masks at 5,000 — with longer production runs to match.
Send the shelf life you need, not just the percentage
Tell us the market, the price tier and how long the product has to stay stable. We reply with the route that fits within 24 hours.