This is the compliance question that derails the most skincare sourcing projects, and it's often misunderstood. Here is the actual framework.

Cosmetics affect appearance. Under the FDA's definition, a cosmetic "cleanses, beautifies, promotes attractiveness, or alters appearance" without intending to affect the structure or function of the body. Moisturizers, cleansers, toners, serums (with cosmetic-grade actives), eye creams, and primers are cosmetics. They fall under cosmetic GMP and MoCRA registration.

OTC drugs affect the body. If your product claims to prevent, treat, mitigate, or cure a condition, it is a drug. The most common skincare OTC drug categories: sunscreens (any SPF claim makes it an OTC drug), acne treatments (benzoyl peroxide, salicylic acid, resorcinol, sulfur at labeled concentrations), anti-dandruff (zinc pyrithione, selenium sulfide), and skin-lightening products with certain active concentrations.

Why this matters for sourcing. OTC drugs must be manufactured at a facility compliant with FDA's drug GMP regulations (21 CFR Parts 210/211), which are significantly stricter than cosmetic GMP. Cosmetic OEM labs — including most Korean OEM labs — are not drug GMP certified. If your formula has an SPF claim, your Korean OEM lab cannot legally produce it for US sale. You need a domestic US lab with drug GMP certification, or a Korean lab that holds US drug GMP (rare and expensive).

Retinol: cosmetic in the US, restricted in the EU. Pure retinol (vitamin A alcohol) is a cosmetic ingredient in the US at typical use concentrations. The EU has set maximum retinol concentrations for face products (0.3% in leave-on, 0.05% in eye area) — if you're selling in both markets, confirm your formula is within EU limits or formulate separately for EU.

Niacinamide, AHAs, BHAs. These are cosmetic ingredients at typical concentrations. AHAs (glycolic, lactic) at high concentrations require safety assessment and may trigger EU-specific rinse-off/leave-on concentration limits. None of these trigger OTC drug status on their own. Claims that an AHA "treats acne" would be a drug claim; claims that it "exfoliates" or "brightens" are cosmetic claims.

See also: cosmetics private label sourcing guide for the full compliance framework including MoCRA and EU CPNP.

Korea's cosmetics manufacturing industry is the most export-oriented in the world. Understanding how it works — and where it's right for your brand — is essential for any skincare sourcing strategy.

Where Korean OEM labs are. The industry is concentrated in Gyeonggi-do province (surrounding Seoul), with significant presence in Incheon and Chungcheongnam-do. Major OEM labs include Cosmax, Kolmar Korea, OEM Lab, and hundreds of mid-size specialists. These facilities collectively produce for thousands of international brands across skincare, color cosmetics, and haircare.

Why Korean OEM for skincare specifically. Korea's domestic cosmetics market is one of the most innovation-driven in the world — new active ingredients, new delivery systems, new texture formats are adopted faster than in the US or EU. The OEM labs that supply Korean brands then make that technology available to international private label buyers. Layered serum textures, fermented ingredient complexes, ceramide formulations, niacinamide concentrations that outperform — much of this originates in Korean OEM labs before appearing in Western prestige brands at 10x the price.

MOQ advantage. Korean OEM labs typically have lower MOQs than domestic US labs for skincare — 300–1,000 units for stock formulas is common, versus 1,000–5,000 units at comparable US labs. This makes Korea the default first call for founders validating a skincare SKU at under 1,000-unit commitment.

Regulatory positioning. Korean OEM labs operate under Korean cosmetic GMP, which aligns with ISO 22716. KFDA (Korean Ministry of Food and Drug Safety) regulations are rigorous. Goods exported to the US must also comply with MoCRA registration requirements — which many major Korean OEM labs now handle as part of their export service. Verify MoCRA compliance status explicitly.

What Korean OEM is not the answer for. OTC drug production (SPF, acne). Made-in-USA claims. Products where short domestic lead time is critical (10-week window or less). Brands where "made in Korea" is not consistent with their positioning (rare but it happens).

Domestic US skincare labs are the right choice when regulatory simplicity, OTC drug capability, or short lead times are non-negotiable.

US lab strengths. MoCRA-native compliance. OTC drug GMP capability at labs that hold 21 CFR Parts 210/211 certification — critical for SPF and acne categories. Made-in-USA claim availability. Faster lead times (4–10 weeks for stock formulas vs. 8–14 weeks including ocean freight for Korean OEM). English-language communication and contract negotiation. No customs clearance complexity.

US lab limitations. Higher MOQs than Korean OEM — most US labs don't work economically below 1,000–2,500 units for custom skincare work. Higher per-unit cost at comparable volumes — domestic labor, regulatory overhead, and facility costs are higher. Less aggressive formulation innovation at the stock-formula level — stock formulas at US labs tend to be more conservative on active concentrations than Korean equivalents.

Regional US lab clusters. California: natural, clean, and clinical-grade skincare specialists. Strong for brands selling into California's clean beauty retail channels (Erewhon, local health retailers). New York / New Jersey: fragrance-forward and prestige skincare labs with EU compliance experience. Texas: manufacturing scale at lower cost. Pacific Northwest: sustainable and natural-focus labs.

When to choose domestic. Your formula includes SPF. Your retail partner requires made-in-USA. Your lead time is under 10 weeks. Your brand story requires domestic manufacturing origin. Your MOQ is above 2,500 units and cost-per-unit differential with Korea is manageable.

"Clean beauty" is a marketing positioning, not a regulatory category. There is no FDA definition of "clean." This creates both opportunity and risk for sourcing.

The common "free-from" standards. Clean beauty positioning typically involves claiming freedom from a defined list of ingredients. The most common list: parabens (methylparaben, propylparaben, butylparaben), sulfates (SLS, SLES), phthalates, synthetic fragrance (undisclosed fragrance mixtures), formaldehyde and formaldehyde donors, mineral oil/petrolatum, polyethylene glycols (PEGs), silicones (varies by brand).

How to substantiate a clean beauty claim. Get the full INCI ingredient list from your manufacturer. Check each ingredient against your specific clean standard. The Environmental Working Group's Skin Deep database is the most widely referenced consumer-facing tool. Sephora's Clean at Sephora program publishes its prohibited ingredients list. If you're targeting those retail channels, use those lists as your specification.

Retailer program requirements. "Clean at Sephora," "Target Clean," and similar retailer clean programs have specific requirements that go beyond self-labeling. If your go-to-market path includes these retailers, get their current prohibited ingredient list before finalizing your formula. Lists update — confirm currency before launch.

Fragrance disclosure. EU Cosmetics Regulation 1223/2009 requires disclosure of 26 designated fragrance allergens above threshold concentrations. California's Cleaning Product Right to Know Act has separate fragrance disclosure requirements. "Fragrance-free" and "unscented" have specific meanings — "fragrance-free" means no fragrance materials were added; "unscented" may use masking fragrance. Know the distinction before using either claim.

Vegan and cruelty-free. "Cruelty-free" typically means no animal testing — certifying bodies include Leaping Bunny and PETA's Beauty Without Bunnies program. "Vegan" means no animal-derived ingredients. Neither term is regulated by FDA. Both require substantiation against a defined standard if you're making the claim commercially. Your manufacturer must confirm no animal-derived ingredients in the formula or manufacturing process for a vegan claim.

Stability testing is not optional for skincare — it's the evidence that your product will perform as labeled through its claimed shelf life. Here is how it works.

Accelerated stability testing. The industry standard is 40°C / 75% relative humidity for 3 months minimum, following ICH Q1A guidelines. This accelerated aging protocol provides predictive data for shelf life. Failing accelerated stability means the formula as formulated in that packaging will not hold up — it's cheaper to discover this at 3 months than after a production run is in retail. Evaluation criteria: pH, viscosity, color, odor, appearance (separation, precipitation, phase separation), microbial limits, and active ingredient potency if applicable.

Real-time stability. Running concurrently with accelerated testing, real-time stability at 25°C / 60% RH for the claimed shelf life period (12–36 months typically) provides the definitive shelf-life data. Retailers and private-label agreements often require real-time stability data before listing. Plan for this timeline in your development roadmap — it runs in the background while your brand launches.

Packaging compatibility. Stability testing must be run in the actual packaging you'll use for production — not a placeholder container, not a similar container. Airless pumps, dropper bottles with rubber seals, aluminum jars, and PET tubes all interact differently with formulas. Vitamin C serums are notorious for oxidizing in contact with certain rubber components. Retinol destabilizes in transparent glass. Run stability in-pack.

Challenge testing (preservation testing). Separate from stability, challenge testing (USP <51>, ISO 11930) confirms that your preservative system is effective against microbial challenge. Cosmetics must resist microbial contamination through the product's use period. Challenge testing is typically one-time per formula, not per batch.

Who runs it. Strong manufacturers run stability in-house and provide you with results as part of the formula development engagement. If your manufacturer outsources stability testing, ask which lab they use and confirm the lab's accreditation. Stability data should accompany every formula you take to market.

Skincare packaging is a supply chain unto itself. Most skincare manufacturers provide standard packaging options (basic airless pumps, generic jars, stock dropper bottles) but custom or brand-specific packaging requires a separate engagement.

The packaging lead time problem. Custom packaging — unique pump mechanisms, branded glass bottles, specialty closures — typically has a 6–12 week lead time and separate MOQs. If you start packaging development after formula approval, you're adding 6–12 weeks to your launch timeline unnecessarily. Start packaging development in parallel with formula development, not after it.

What "custom packaging" actually means. At the low end: selecting stock packaging components in custom colors (anodized aluminum lids, colored caps on standard airless pumps). At the mid level: purchasing stock component molds with your logo engraved ($2,000–8,000 per mold). At the high end: custom-designed components from a packaging supplier (minimum 5,000–10,000 unit commitments, 12–20 week development).

Airless pump packaging. The dominant packaging choice for serums and vitamin C products. Airless pumps prevent oxidation by eliminating the air space above the formula. They're also more expensive than standard jar or bottle packaging ($0.40–1.20/unit versus $0.15–0.45 for basic jars). Confirm compatibility of your formula with the specific pump mechanism — some actives react with pump spring materials.

Packaging sourcing separately from manufacturing. You can source packaging from a packaging company and have it delivered to your manufacturer — this is common practice. It gives you more packaging options than what the manufacturer carries in-house and lets you develop brand-specific packaging without manufacturer constraints. The tradeoff is logistics coordination and the risk of component incompatibility.

See also: packaging design services at PLS.