Yes, you can private label a vitamin C serum, and most contract manufacturers will take the project. But the decision that sets your price, packaging, lead time and failure rate happens before you contact anyone: which form of vitamin C you order and at what concentration. L-ascorbic acid is the most potent and the least stable; derivatives like sodium ascorbyl phosphate or ethyl ascorbic acid are gentler and far easier to keep alive on a shelf. Pick the form first, then pick the route and the factory.
A vitamin C serum looks simple and behaves like one of the fussiest products in skincare. Unlike a lip balm or a basic lotion, the active ingredient fights you the whole way: pure vitamin C oxidises in contact with air, light and water, turning amber, smelling sour and losing its effect. That is why the upstream choices matter more here than almost anywhere else in private label beauty. This guide walks the decisions in the order a founder should actually make them.
- White label (ready-made / ready-to-go formula)
- You apply your brand to an existing, already-stabilised formula. Minimum order from a manufacturer like Moe’s Group starts at 200 units. Fastest and lowest upfront cost of the three routes — but only if a suitable vitamin C base already exists.
- Private label (custom formulation)
- Chemists develop a formula to your brief: your derivative, concentration, pH and base. Minimum order starts at 1,000 units. More brand control than white label, and more lead time, because the stability work has to finish before production can start.
- Contract manufacturing
- The broad manufacturing service a brand buys. Formulation, formula ownership, pricing and lead time are set per project, so the cost and timeline depend on what you agree rather than on the label alone.
What form of vitamin C are you actually ordering?
“Vitamin C serum” is not one product. The industry uses at least five common forms, and they behave so differently that choosing one is really choosing your packaging, your pH and how hard your manufacturer has to work to keep the serum stable. Get this right and the rest of the project gets easier.
| Form | Solubility | Stability | Typical pH | Notes |
|---|---|---|---|---|
| L-Ascorbic Acid (LAA) | Water | Moderate — needs protection | 2.8–3.5 | Most potent; highest irritation risk; the most formulation and packaging work. |
| 3-O-Ethyl Ascorbic Acid (EAA) | Water and oil | High | 4.0–5.5 | A practical choice for everyday brightening serums. |
| Sodium Ascorbyl Phosphate (SAP) | Water | High | 6.0–7.0 | Gentle and stable; common in sensitive-skin formulas. |
| Tetrahexyldecyl Ascorbate (THD) | Oil | Very high | 5.5–6.5 | Oil-soluble, higher cost, tolerant of standard packaging. |
| Ascorbyl Glucoside (AA-2G) | Water | High | 5.0–7.0 | Slow-release; well suited to gentler formulas. |
LAA is the form most shoppers mean when they picture “vitamin C,” and it is the one that gives a serum its brightening reputation and its reputation for going off. Derivatives trade a little immediacy for a serum that survives shipping and a year on a shelf. A common commercial choice is a stabilised derivative at a workable pH; a common premium choice is LAA done carefully. Neither is wrong — but they are different manufacturing jobs, so decide before you ask for a quote. For an independent view of what finished serums on the market actually use, Wirecutter’s vitamin C serum reviews are a useful consumer-side reference.
White label or custom formulation — what each means for vitamin C?
This is where the pinned terminology matters, because the two routes carry different minimum orders and different timelines, and vitamin C exaggerates the gap between them.
White label means you take a formula the manufacturer has already developed and stabilised, choose your packaging, and apply your label. The minimum order is 200 units. It is the fastest and lowest upfront-cost route — but it only works if the manufacturer already holds a vitamin C base with the derivative, concentration and feel you want. If you have a specific derivative or a particular concentration in mind, a stock formula may not match it.
Private label / custom formulation means chemists build the serum to your brief. The minimum order is 1,000 units. You get more control and the formula is tailored to your positioning, but it adds lead time, and with vitamin C that extra time is not padding — it is the stability testing described below, which cannot be rushed without risking a serum that browns after launch.
So the ordering holds: white label sits below private label, which sits below broader contract manufacturing, on upfront cost, on lead time and on how much brand control you take on. But do not translate that into a dollar figure or a number of days from the tier alone — vitamin C’s own difficulty, your packaging and your testing plan move those numbers more than the label does. If you are still weighing suppliers in general, Moe’s Group has a plain-language checklist for how to choose a private label manufacturer.
What does stability testing look like, and why does it add time?
Here is the part that goes wrong, stated plainly. Pure vitamin C oxidises — LAA converts to dehydroascorbic acid and then to diketogulonic acid — and the visible result is an amber or brown serum, a sour odor, lost brightening performance and a wave of returns. A responsible manufacturer catches that in the lab, not in your customers’ bathrooms.
That is what stability testing is for. The standard pairing is an accelerated test at 40°C and 75% relative humidity for several weeks, run alongside a real-time test at 25°C and 60% relative humidity that continues for up to 24 months. The accelerated test is the one that adds weeks to a custom timeline, because the formula has to prove it survives heat and humidity before production is locked. Technical stability protocols along these lines are described by suppliers such as AJC Cosmolabs (competitor source, cited for technical context only; retrieved 2026-10-02).
Stability also drives packaging. LAA formulas strongly prefer airless pumps, opaque or frosted glass, and often nitrogen-purged filling to keep oxygen out of the bottle. Derivative-based formulas are more forgiving and can tolerate standard dropper bottles, though UV-protective packaging still helps. Ask any manufacturer for a redacted certificate of analysis from a prior vitamin C run; one that will not show you stability data is telling you something.
Where is Moe’s Group the wrong fit for a vitamin C serum?
An honest guide has to say where a manufacturer does not fit, so here it is. Moe’s Group is a US (Chatsworth, California) contract manufacturer that is FDA registered. That is a facility status; cosmetics have no equivalent government sign-off at all (FDA cosmetics labeling guidance). It suits established and growth-stage brands ordering 200+ units white label or 1,000+ custom, working in standard serum formats with stable derivatives. It is likely the wrong fit in these cases:
| If you need… | Look at instead (checked 2026-10-02) |
|---|---|
| Under 200 units — a proof-of-concept or launch test | AJC Cosmolabs and other low-MOQ US labs; confirm their current minimum directly, as MOQs change. |
| EU or UK launch with CPNP/PIF filing bundled into manufacturing | An EU-based manufacturer such as DEL’LA SOFT (Turkey); verify current MOQ and included regulatory docs on their own page. |
| Asia-first supply chain or direct China sourcing | China OEMs such as Zerun Cosmetic or Lezha Beauty; check their own current terms. |
| Clinical-grade high-percentage LAA in nitrogen-flushed airless packs | Verify any manufacturer’s filling line handles high-LAA formats first; specialist labs such as SkinCraft Lab may suit. Do not assume any single factory, including Moe’s, runs this format — ask. |
One piece of market context worth knowing: according to Wirecutter, the patent on SkinCeuticals’ original CE Ferulic formula (roughly 10% LAA with 1% ferulic acid and 1% vitamin E) expired in 2025, so any GMP lab can now reproduce that combination. If that is the serum you want, it is effectively a commodity formula today — price-shop it widely rather than paying a premium for the recipe. For scale context, the US vitamin C serum market is estimated in the low billions of dollars, with stabilised derivatives making up a growing share of new launches (IndexBox, 2026).
What should you ask a manufacturer before you sign?
Walk in with these questions and you will sort a capable partner from a hopeful one quickly:
- Which vitamin C form and concentration is in your stock serum, and can you formulate the one I want?
- What pH does the finished formula hold, and how do you keep it there?
- Does your filling line offer airless or nitrogen-purged filling for LAA formats?
- Can you share a redacted CoA and stability data from a prior vitamin C production run?
- White label or custom for my case — and what minimum order and timeline does each carry for this serum specifically?
The answers tell you whether the factory treats vitamin C as a routine job or a serious one. It should be the latter.
Frequently asked questions
Can you private label a vitamin C serum? Yes. You can apply your brand to an existing stabilised formula (white label, from 200 units) or have one developed to your brief (custom formulation, from 1,000 units). The form of vitamin C you choose matters more than the route.
Which vitamin C form is most stable? Derivatives such as tetrahexyldecyl ascorbate, sodium ascorbyl phosphate and ethyl ascorbic acid are considerably more stable than pure L-ascorbic acid, which is the most potent but the most prone to oxidising.
What concentration is typical? Leave-on serums commonly sit in the 5–20% range, with 10–15% widely cited as a practical sweet spot. The right number depends on the form and your audience.
Why do vitamin C serums turn brown? That amber or brown color is oxidation — the vitamin C degrading. Low pH, antioxidant co-ingredients like ferulic acid and vitamin E, and air-tight opaque packaging all slow it down.
What minimum order should I expect? From a manufacturer like Moe’s Group, 200 units for a ready-made white-label formula and 1,000 units for a custom formulation. Other manufacturers set their own minimums; confirm each directly.
If you have decided on your form, concentration and route and want to talk specifics with a US manufacturer, Moe’s Group takes project enquiries through its product inquiry form.
