GHK-Cu is a copper peptide complex. Retinol is a form of vitamin A. Their ingredient names, research and formulation requirements differ; they should not be described as interchangeable just because both appear in skincare marketing.
What Blue Hour can establish
Blue Hour contains Copper Tripeptide-1 and no labeled retinol. It has not been compared with retinol in a verified human efficacy study. We do not claim retinol-equivalent results, guaranteed gentleness or a substitute for prescribed skincare.
Planning your routine
Follow the directions for each finished product rather than a general ingredient compatibility chart. Introduce one new product at a time. Blue Hour’s label specifically warns against layering it in the same routine with direct vitamin C (L-ascorbic acid) or AHA/BHA exfoliating acids. It does not establish that every possible combination with retinol will be tolerated.
Blue Hour formula and directions
Blue Hour is a 30 ml / 1 fl oz pump serum priced at $30 USD. Its labeled ingredients include Copper Tripeptide-1, glycerin, sodium hyaluronate, niacinamide, Bifida Ferment Filtrate and Centella Asiatica Extract.
Apply 1–2 pumps to a freshly cleansed, slightly damp face and neck. Let it absorb, then follow with moisturizer. If using during the day, follow with sunscreen before makeup.
Do not layer in the same routine with direct vitamin C (L-ascorbic acid) or AHA/BHA exfoliating acids. For external use only. Avoid contact with eyes; rinse with water if contact occurs. Stop use if irritation or redness persists. Keep out of reach of children.
Made in China by Guangzhou Baiyanhui Cosmetics Co., Ltd. Distributed by Mora Lora LLC for Only Child.
The formula contains no added fragrance, essential oils or retinol. This does not establish guaranteed gentleness or suitability for every skin type. Patch test before first use. Ingredient research is not a finished-product study; Blue Hour has no verified human efficacy or sensitive-skin study establishing specific results or timelines.
Full Blue Hour ingredients and product details · Contact Only Child