Private label vitamin C serum is a skin serum made by a cosmetics lab and sold under your brand. US makers publish minimums as low as 25 units, so testing is cheap. Two things decide whether the product succeeds. First, stability: L-ascorbic acid, the classic form of vitamin C, oxidizes easily, which turns serums dark and less effective. Second, claims: the FDA treats claims such as boosting collagen as drug claims, and it has sent a warning letter over exactly that wording on a vitamin C serum.
I’ll compare makers, then cover what research says about formulation, the claims line, and selling on Amazon.
Vitamin C serum makers and minimums
From each company’s own site, checked in October 2026:
| Manufacturer | Location | Published minimum | Notes |
|---|---|---|---|
| Trilogy Laboratories | Fort Myers, Florida | 25 units for its Vitamin C 20% Serum | Says it is ISO 22716 certified and MoCRA compliant |
| Lady Burd | Farmingdale, New York | Custom labels from 50 pieces | Stock vitamin C serum |
| RainShadow Labs | St Helens, Oregon | 10 gallons for stock private label; custom from 25 gallons with $5,000 per product | Bulk volume, not units |
My take: start with a stock serum at a 25 or 50-unit minimum, test how it holds up over a few months in your bottle, then decide whether a custom formula is worth it.
What research says about formulation
Peer-reviewed reviews of topical vitamin C point to a few principles worth asking your lab about:
- It’s unstable. L-ascorbic acid is described as a hydrophilic and unstable molecule, highly vulnerable to oxidation in water-based systems; darkening under normal storage is a sign.
- Low pH helps. Reducing pH below 3.5 is described as an effective way to improve both stability and skin penetration.
- Concentration has a sweet spot. One review says concentrations need to be higher than 8% to matter, and that going above 20% doesn’t add benefit and may cause irritation.
- Packaging matters. Stability improves when oxygen is kept out during formulation and the product uses low pH and opaque packaging.
When you review samples, ask the lab: what form of vitamin C, at what percentage, at what pH, and what stability testing in your exact bottle? Then watch the color over a few weeks. A serum that turns orange in your bathroom will do the same for customers.
The claims line: cosmetic or drug?
The FDA says products intended to affect the structure or function of the skin are drugs, even if they also affect appearance. Its examples include claims to remove wrinkles or increase the skin’s production of collagen. “Regenerate cells” is another drug claim. Moisturizing, by contrast, is a cosmetic claim.
| Cosmetic wording | Drug claims to avoid |
|---|---|
| “Brightens the look of skin” | “Boosts collagen production” |
| “Hydrating vitamin C serum” | “Removes wrinkles” |
| “For a more radiant-looking complexion” | “Repairs damaged skin” or “regenerates cells” |
This isn’t theoretical. In 2017 the FDA issued a warning letter to a company whose serum claimed vitamin C “stimulates collagen production.” Honestly, that exact claim appears on countless vitamin C serum listings; I’d keep it off yours.
MoCRA, briefly
Sold as a cosmetic, a vitamin C serum falls under MoCRA: product listing, serious adverse event reporting within 15 business days, safety substantiation records and US contact information on the label, with a small business exemption from listing and registration below $1 million in average annual US cosmetic sales. Our guide to private label skin care explains it in more depth.
Selling vitamin C serum on Amazon
- Beauty documentation. Amazon may request invoices for 10 or more units, a GMP certificate, a Certificate of Analysis and MoCRA documentation.
- Claims everywhere. Titles, bullets, images and A+ content all count. Our guide to Amazon A+ content guidelines shows what’s allowed.
- Shelf life. Show how to store it, and state when to use it after opening.
Serums sell well alongside cleansers and moisturizers; see our guide to private label body care products. If you’d like a team to source and vet labs, that’s our complete sourcing management service.
FAQ
What is the minimum order for private label vitamin C serum?
US makers publish minimums from 25 units for a stock serum and 50 pieces for custom labels. Bulk programs start at 10 gallons.
What percentage of vitamin C should a serum have?
Research reviews suggest above 8% to be effective, with no added benefit above 20% and a higher chance of irritation.
Why does vitamin C serum turn orange?
L-ascorbic acid oxidizes easily, and darkening is a sign of that. Low pH, keeping oxygen out and opaque packaging help stability.
Can I say my vitamin C serum boosts collagen?
Not as a cosmetic. The FDA treats claims to increase collagen production as drug claims, and has issued a warning letter over that wording.
Is vitamin C serum regulated under MoCRA?
Yes, when sold as a cosmetic. Listing, adverse event reporting and labeling duties apply, with a small business exemption from listing and registration.
What packaging is best for vitamin C serum?
Opaque packaging that limits light and air exposure. Ask your lab what they’ve stability-tested.
Last updated: October 5, 2026. General information, not legal or medical advice. Sources: FDA, wrinkle treatments and other anti-aging products; FDA, Is it a cosmetic, a drug, or both?; FDA, Star Health & Beauty warning letter (2017); Al-Niaimi & Chiang, J Clin Aesthet Dermatol (2017); Elhabak et al., Drug Delivery (2021); Esfandiyari & Ahmadi Ashtiani, J Skin Stem Cell (2025); FDA, MoCRA; Trilogy Laboratories; Lady Burd; RainShadow Labs.
