Peptide Serum Private Label FAQ
What peptides are commonly used in anti-aging serums?
Common serum peptides fall into three groups: signal peptides such as palmitoyl pentapeptide-4 that support collagen messaging, carrier peptides like copper tripeptide-1 that deliver trace minerals, and neuropeptides such as acetyl hexapeptide-8 positioned for expression lines. Each targets a different mechanism, so the choice depends on the claim you want to make.
What percentage of peptide should a serum contain?
Most effective peptide serums use roughly 0.1% to 2% of a specific peptide or complex. There is no regulated minimum, so the right level is set by the manufacturer's stability and efficacy data rather than by chasing a high number — in peptide skincare, formulation quality matters more than concentration alone.
Why is stability testing critical for peptide serums?
Peptides are water-soluble actives that degrade with heat, pH extremes, and time, and a water-based serum needs a preservative system that passes challenge testing. Stability testing proves the peptide stays active and the formula stays safe across the product's shelf life — which is why the formulation file matters more than the ingredient list.
What claims can a private-label brand make for a peptide serum?
Claims must match substantiation and local rules. The EU Cosmetics Regulation prohibits efficacy claims without adequate evidence, and the US FDA treats cosmetics claims differently from drug claims. Defensible wording stays in the "supports / helps improve the appearance of" register and avoids physiological promises such as "stimulates collagen."
How do I qualify an OEM for peptide formulation?
Verify three capabilities: a cold-process or low-heat production line, since peptides degrade with heat; an in-house challenge-test lab for water-based actives; and regulatory documentation support including EU CPNP notification and US labeling review. Ask for reference formulas and stability summaries before committing to a partner.
Do peptide serums need special packaging?
Peptide actives are sensitive to light, heat, and air, so opaque airless pumps or dark glass bottles with tight closures are preferred over wide-mouth jars. Ask the OEM for compatibility data between the formula and the proposed packaging to avoid active degradation during shelf life.