Yes — copper peptides layer well with most actives. In the morning, apply the serum before vitamin C and SPF. In the evening, copper peptides and retinol can be used in the same routine, but some people prefer to alternate nights if their skin is sensitive. Start by using the serum alone for 1–2 weeks before introducing other actives.
Most customers feel skin is softer and more hydrated within the first week. Visible improvements in tone and texture typically begin around week 3–4. For firmness, elasticity, and reduction in fine lines, consistent use over 8–12 weeks delivers the most noticeable results. That's exactly why we offer a 90-day guarantee
Most mass-market serums contain peptides at trace concentrations — often under 0.1%. BioGlo uses 2% GHK-Cu, the concentration range studied in published research. We also publish our Certificates of Analysis so you can verify exactly what's in your bottle. No proprietary blends, no hidden concentrations.
Yes. Our formula includes panthenol and allantoin specifically to support sensitive skin. Copper peptides are generally very well-tolerated. We recommend patch-testing on your inner arm for 24 hours before full application. If you have a diagnosed skin condition, consult your dermatologist first.
2–3 drops is all you need for your full face and neck. Apply to clean skin before moisturizer. The serum works morning and night — morning before SPF, evening before your night cream. One 30ml bottle typically lasts 6–8 weeks with twice-daily use.
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