This guide is written by Only Child, the brand behind Blue Hour Serum. We do not rank a serum as universally “best.” A useful comparison starts with the formula, the directions and evidence for the finished product.
Questions to ask before choosing
- Is the full ingredient list available, including preservatives and supporting ingredients?
- Does a percentage describe the named active ingredient or a supplied ingredient blend?
- Do performance claims come from a human study of this finished product, ingredient research or customer feedback?
- Do the directions fit the other products you use?
- What is the total cost for the same bottle size, including shipping and tax?
Compare price and size fairly
Blue Hour’s $30 USD price for 30 ml is $1 per ml before shipping and tax. Free US shipping at Only Child applies to orders over $50. Check the total at checkout when comparing a single bottle. Prices, formulas and availability can change, so use the current manufacturer’s product page for each comparison.
Read concentration claims carefully
The supplier declares 1% Copper Tripeptide-1. This is a supplier declaration, not independent verification of pure GHK-Cu in a finished Blue Hour batch. A percentage alone does not establish how a product will perform.
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